fix: Update C code for compatibility with the MSVC compiler (#949)

* Replace VLA with malloc
Replace VLA with malloc to make C code
compatible with cl compiler on Windows.

* Fix C code for CI compiler.

* Fix C code compability to CI.

* check the trigger

codes/c/chapter_array_and_linkedlist/array.c

@@ -76,7 +76,7 @@ int main() {
     printf("数组 arr = ");
     printArray(arr, size);
 
-    int nums[5] = {1, 3, 2, 5, 4};
+    int nums[] = {1, 3, 2, 5, 4};
     printf("数组 nums = ");
     printArray(nums, size);
 

codes/c/chapter_backtracking/preorder_traversal_i_compact.c

@@ -36,7 +36,7 @@ int main() {
     preOrder(root);
 
     printf("\n输出所有值为 7 的节点\n");
-    int vals[resSize];
+    int *vals = malloc(resSize * sizeof(int));
     for (int i = 0; i < resSize; i++) {
         vals[i] = res[i]->val;
     }
@@ -44,5 +44,6 @@ int main() {
 
     // 释放内存
     freeMemoryTree(root);
+    free(vals);
     return 0;
 }

codes/c/chapter_backtracking/preorder_traversal_ii_compact.c

@@ -46,12 +46,13 @@ int main() {
 
     printf("\n输出所有根节点到节点 7 的路径\n");
     for (int i = 0; i < resSize; ++i) {
-        int vals[MAX_SIZE];
+        int *vals = malloc(MAX_SIZE * sizeof(int));
         int size = 0;
         for (int j = 0; res[i][j] != NULL; ++j) {
             vals[size++] = res[i][j]->val;
         }
         printArray(vals, size);
+        free(vals);
     }
 
     // 释放内存

codes/c/chapter_backtracking/preorder_traversal_iii_compact.c

@@ -47,12 +47,13 @@ int main() {
 
     printf("\n输出所有根节点到节点 7 的路径，要求路径中不包含值为 3 的节点\n");
     for (int i = 0; i < resSize; ++i) {
-        int vals[MAX_SIZE];
+        int *vals = malloc(MAX_SIZE * sizeof(int));
         int size = 0;
         for (int j = 0; res[i][j] != NULL; ++j) {
             vals[size++] = res[i][j]->val;
         }
         printArray(vals, size);
+        free(vals);
     }
 
     // 释放内存

codes/c/chapter_backtracking/preorder_traversal_iii_template.c

@@ -78,12 +78,13 @@ int main() {
 
     printf("\n输出所有根节点到节点 7 的路径，要求路径中不包含值为 3 的节点\n");
     for (int i = 0; i < resSize; ++i) {
-        int vals[MAX_SIZE];
+        int *vals = malloc(MAX_SIZE * sizeof(int));
         int size = 0;
         for (int j = 0; res[i][j] != NULL; ++j) {
             vals[size++] = res[i][j]->val;
         }
         printArray(vals, size);
+        free(vals);
     }
 
     // 释放内存

codes/c/chapter_dynamic_programming/climbing_stairs_constraint_dp.c

@@ -12,8 +12,10 @@ int climbingStairsConstraintDP(int n) {
         return 1;
     }
     // 初始化 dp 表，用于存储子问题的解
-    int dp[n + 1][3];
+    int **dp = malloc((n + 1) * sizeof(int *));
-    memset(dp, 0, sizeof(dp));
+    for (int i = 0; i <= n; i++) {
+        dp[i] = calloc(3, sizeof(int));
+    }
     // 初始状态：预设最小子问题的解
     dp[1][1] = 1;
     dp[1][2] = 0;
@@ -24,7 +26,13 @@ int climbingStairsConstraintDP(int n) {
         dp[i][1] = dp[i - 1][2];
         dp[i][2] = dp[i - 2][1] + dp[i - 2][2];
     }
-    return dp[n][1] + dp[n][2];
+    int res = dp[n][1] + dp[n][2];
+    // 释放内存
+    for (int i = 0; i <= n; i++) {
+        free(dp[i]);
+    }
+    free(dp);
+    return res;
 }
 
 /* Driver Code */

codes/c/chapter_dynamic_programming/coin_change.c

@@ -7,7 +7,7 @@
 #include "../utils/common.h"
 
 /* 求最小值 */
-int min(int a, int b) {
+int myMin(int a, int b) {
     return a < b ? a : b;
 }
 
@@ -16,8 +16,10 @@ int coinChangeDP(int coins[], int amt, int coinsSize) {
     int n = coinsSize;
     int MAX = amt + 1;
     // 初始化 dp 表
-    int dp[n + 1][amt + 1];
+    int **dp = malloc((n + 1) * sizeof(int *));
-    memset(dp, 0, sizeof(dp));
+    for (int i = 0; i <= n; i++) {
+        dp[i] = calloc(amt + 1, sizeof(int));
+    }
     // 状态转移：首行首列
     for (int a = 1; a <= amt; a++) {
         dp[0][a] = MAX;
@@ -30,11 +32,17 @@ int coinChangeDP(int coins[], int amt, int coinsSize) {
                 dp[i][a] = dp[i - 1][a];
             } else {
                 // 不选和选硬币 i 这两种方案的较小值
-                dp[i][a] = min(dp[i - 1][a], dp[i][a - coins[i - 1]] + 1);
+                dp[i][a] = myMin(dp[i - 1][a], dp[i][a - coins[i - 1]] + 1);
             }
         }
     }
-    return dp[n][amt] != MAX ? dp[n][amt] : -1;
+    int res = dp[n][amt] != MAX ? dp[n][amt] : -1;
+    // 释放内存
+    for (int i = 0; i <= n; i++) {
+        free(dp[i]);
+    }
+    free(dp);
+    return res;
 }
 
 /* 零钱兑换：空间优化后的动态规划 */
@@ -42,8 +50,7 @@ int coinChangeDPComp(int coins[], int amt, int coinsSize) {
     int n = coinsSize;
     int MAX = amt + 1;
     // 初始化 dp 表
-    int dp[amt + 1];
+    int *dp = calloc(amt + 1, sizeof(int));
-    memset(dp, MAX, sizeof(dp));
     dp[0] = 0;
     // 状态转移
     for (int i = 1; i <= n; i++) {
@@ -53,11 +60,14 @@ int coinChangeDPComp(int coins[], int amt, int coinsSize) {
                 dp[a] = dp[a];
             } else {
                 // 不选和选硬币 i 这两种方案的较小值
-                dp[a] = min(dp[a], dp[a - coins[i - 1]] + 1);
+                dp[a] = myMin(dp[a], dp[a - coins[i - 1]] + 1);
             }
         }
     }
-    return dp[amt] != MAX ? dp[amt] : -1;
+    int res = dp[amt] != MAX ? dp[amt] : -1;
+    // 释放内存
+    free(dp);
+    return res;
 }
 
 /* Driver code */

codes/c/chapter_dynamic_programming/coin_change_ii.c

@@ -10,8 +10,10 @@
 int coinChangeIIDP(int coins[], int amt, int coinsSize) {
     int n = coinsSize;
     // 初始化 dp 表
-    int dp[n + 1][amt + 1];
+    int **dp = malloc((n + 1) * sizeof(int *));
-    memset(dp, 0, sizeof(dp));
+    for (int i = 0; i <= n; i++) {
+        dp[i] = calloc(amt + 1, sizeof(int));
+    }
     // 初始化首列
     for (int i = 0; i <= n; i++) {
         dp[i][0] = 1;
@@ -28,15 +30,20 @@ int coinChangeIIDP(int coins[], int amt, int coinsSize) {
             }
         }
     }
-    return dp[n][amt];
+    int res = dp[n][amt];
+    // 释放内存
+    for (int i = 0; i <= n; i++) {
+        free(dp[i]);
+    }
+    free(dp);
+    return res;
 }
 
 /* 零钱兑换 II：空间优化后的动态规划 */
 int coinChangeIIDPComp(int coins[], int amt, int coinsSize) {
     int n = coinsSize;
     // 初始化 dp 表
-    int dp[amt + 1];
+    int *dp = calloc(amt + 1, sizeof(int));
-    memset(dp, 0, sizeof(dp));
     dp[0] = 1;
     // 状态转移
     for (int i = 1; i <= n; i++) {
@@ -50,7 +57,10 @@ int coinChangeIIDPComp(int coins[], int amt, int coinsSize) {
             }
         }
     }
-    return dp[amt];
+    int res = dp[amt];
+    // 释放内存
+    free(dp);
+    return res;
 }
 
 /* Driver code */

codes/c/chapter_dynamic_programming/edit_distance.c

@@ -7,7 +7,7 @@
 #include "../utils/common.h"
 
 /* 求最小值 */
-int min(int a, int b) {
+int myMin(int a, int b) {
     return a < b ? a : b;
 }
 
@@ -30,11 +30,11 @@ int editDistanceDFS(char *s, char *t, int i, int j) {
     int del = editDistanceDFS(s, t, i - 1, j);
     int replace = editDistanceDFS(s, t, i - 1, j - 1);
     // 返回最少编辑步数
-    return min(min(insert, del), replace) + 1;
+    return myMin(myMin(insert, del), replace) + 1;
 }
 
 /* 编辑距离：记忆化搜索 */
-int editDistanceDFSMem(char *s, char *t, int memCols, int mem[][memCols], int i, int j) {
+int editDistanceDFSMem(char *s, char *t, int memCols, int **mem, int i, int j) {
     // 若 s 和 t 都为空，则返回 0
     if (i == 0 && j == 0)
         return 0;
@@ -55,14 +55,16 @@ int editDistanceDFSMem(char *s, char *t, int memCols, int mem[][memCols], int i,
     int del = editDistanceDFSMem(s, t, memCols, mem, i - 1, j);
     int replace = editDistanceDFSMem(s, t, memCols, mem, i - 1, j - 1);
     // 记录并返回最少编辑步数
-    mem[i][j] = min(min(insert, del), replace) + 1;
+    mem[i][j] = myMin(myMin(insert, del), replace) + 1;
     return mem[i][j];
 }
 
 /* 编辑距离：动态规划 */
 int editDistanceDP(char *s, char *t, int n, int m) {
-    int dp[n + 1][m + 1];
+    int **dp = malloc((n + 1) * sizeof(int *));
-    memset(dp, 0, sizeof(dp));
+    for (int i = 0; i <= n; i++) {
+        dp[i] = calloc(m + 1, sizeof(int));
+    }
     // 状态转移：首行首列
     for (int i = 1; i <= n; i++) {
         dp[i][0] = i;
@@ -78,17 +80,21 @@ int editDistanceDP(char *s, char *t, int n, int m) {
                 dp[i][j] = dp[i - 1][j - 1];
             } else {
                 // 最少编辑步数 = 插入、删除、替换这三种操作的最少编辑步数 + 1
-                dp[i][j] = min(min(dp[i][j - 1], dp[i - 1][j]), dp[i - 1][j - 1]) + 1;
+                dp[i][j] = myMin(myMin(dp[i][j - 1], dp[i - 1][j]), dp[i - 1][j - 1]) + 1;
             }
         }
     }
-    return dp[n][m];
+    int res = dp[n][m];
+    // 释放内存
+    for (int i = 0; i <= n; i++) {
+        free(dp[i]);
+    }
+    return res;
 }
 
 /* 编辑距离：空间优化后的动态规划 */
 int editDistanceDPComp(char *s, char *t, int n, int m) {
-    int dp[m + 1];
+    int *dp = calloc(m + 1, sizeof(int));
-    memset(dp, 0, sizeof(dp));
     // 状态转移：首行
     for (int j = 1; j <= m; j++) {
         dp[j] = j;
@@ -106,12 +112,15 @@ int editDistanceDPComp(char *s, char *t, int n, int m) {
                 dp[j] = leftup;
             } else {
                 // 最少编辑步数 = 插入、删除、替换这三种操作的最少编辑步数 + 1
-                dp[j] = min(min(dp[j - 1], dp[j]), leftup) + 1;
+                dp[j] = myMin(myMin(dp[j - 1], dp[j]), leftup) + 1;
             }
             leftup = temp; // 更新为下一轮的 dp[i-1, j-1]
         }
     }
-    return dp[m];
+    int res = dp[m];
+    // 释放内存
+    free(dp);
+    return res;
 }
 
 /* Driver Code */
@@ -125,10 +134,18 @@ int main() {
     printf("将 %s 更改为 %s 最少需要编辑 %d 步\n", s, t, res);
 
     // 记忆化搜索
-    int mem[n + 1][m + 1];
+    int **mem = malloc((n + 1) * sizeof(int *));
-    memset(mem, -1, sizeof(mem));
+    for (int i = 0; i <= n; i++) {
+        mem[i] = malloc((m + 1) * sizeof(int));
+        memset(mem[i], -1, (m + 1) * sizeof(int));
+    }
     res = editDistanceDFSMem(s, t, m + 1, mem, n, m);
     printf("将 %s 更改为 %s 最少需要编辑 %d 步\n", s, t, res);
+    // 释放内存
+    for (int i = 0; i <= n; i++) {
+        free(mem[i]);
+    }
+    free(mem);
 
     // 动态规划
     res = editDistanceDP(s, t, n, m);

codes/c/chapter_dynamic_programming/knapsack.c

@@ -7,7 +7,7 @@
 #include "../utils/common.h"
 
 /* 求最大值 */
-int max(int a, int b) {
+int myMax(int a, int b) {
     return a > b ? a : b;
 }
 
@@ -25,11 +25,11 @@ int knapsackDFS(int wgt[], int val[], int i, int c) {
     int no = knapsackDFS(wgt, val, i - 1, c);
     int yes = knapsackDFS(wgt, val, i - 1, c - wgt[i - 1]) + val[i - 1];
     // 返回两种方案中价值更大的那一个
-    return max(no, yes);
+    return myMax(no, yes);
 }
 
 /* 0-1 背包：记忆化搜索 */
-int knapsackDFSMem(int wgt[], int val[], int memCols, int mem[][memCols], int i, int c) {
+int knapsackDFSMem(int wgt[], int val[], int memCols, int **mem, int i, int c) {
     // 若已选完所有物品或背包无容量，则返回价值 0
     if (i == 0 || c == 0) {
         return 0;
@@ -46,7 +46,7 @@ int knapsackDFSMem(int wgt[], int val[], int memCols, int mem[][memCols], int i,
     int no = knapsackDFSMem(wgt, val, memCols, mem, i - 1, c);
     int yes = knapsackDFSMem(wgt, val, memCols, mem, i - 1, c - wgt[i - 1]) + val[i - 1];
     // 记录并返回两种方案中价值更大的那一个
-    mem[i][c] = max(no, yes);
+    mem[i][c] = myMax(no, yes);
     return mem[i][c];
 }
 
@@ -54,8 +54,10 @@ int knapsackDFSMem(int wgt[], int val[], int memCols, int mem[][memCols], int i,
 int knapsackDP(int wgt[], int val[], int cap, int wgtSize) {
     int n = wgtSize;
     // 初始化 dp 表
-    int dp[n + 1][cap + 1];
+    int **dp = malloc((n + 1) * sizeof(int *));
-    memset(dp, 0, sizeof(dp));
+    for (int i = 0; i <= n; i++) {
+        dp[i] = calloc(cap + 1, sizeof(int));
+    }
     // 状态转移
     for (int i = 1; i <= n; i++) {
         for (int c = 1; c <= cap; c++) {
@@ -64,30 +66,37 @@ int knapsackDP(int wgt[], int val[], int cap, int wgtSize) {
                 dp[i][c] = dp[i - 1][c];
             } else {
                 // 不选和选物品 i 这两种方案的较大值
-                dp[i][c] = max(dp[i - 1][c], dp[i - 1][c - wgt[i - 1]] + val[i - 1]);
+                dp[i][c] = myMax(dp[i - 1][c], dp[i - 1][c - wgt[i - 1]] + val[i - 1]);
             }
         }
     }
-    return dp[n][cap];
+    int res = dp[n][cap];
+    // 释放内存
+    for (int i = 0; i <= n; i++) {
+        free(dp[i]);
+    }
+    return res;
 }
 
 /* 0-1 背包：空间优化后的动态规划 */
 int knapsackDPComp(int wgt[], int val[], int cap, int wgtSize) {
     int n = wgtSize;
     // 初始化 dp 表
-    int dp[cap + 1];
+    int *dp = calloc(cap + 1, sizeof(int));
-    memset(dp, 0, sizeof(dp));
     // 状态转移
     for (int i = 1; i <= n; i++) {
         // 倒序遍历
         for (int c = cap; c >= 1; c--) {
             if (wgt[i - 1] <= c) {
                 // 不选和选物品 i 这两种方案的较大值
-                dp[c] = max(dp[c], dp[c - wgt[i - 1]] + val[i - 1]);
+                dp[c] = myMax(dp[c], dp[c - wgt[i - 1]] + val[i - 1]);
             }
         }
     }
-    return dp[cap];
+    int res = dp[cap];
+    // 释放内存
+    free(dp);
+    return res;
 }
 
 /* Driver Code */
@@ -103,10 +112,18 @@ int main() {
     printf("不超过背包容量的最大物品价值为 %d\n", res);
 
     // 记忆化搜索
-    int mem[n + 1][cap + 1];
+    int **mem = malloc((n + 1) * sizeof(int *));
-    memset(mem, -1, sizeof(mem));
+    for (int i = 0; i <= n; i++) {
+        mem[i] = malloc((cap + 1) * sizeof(int));
+        memset(mem[i], -1, (cap + 1) * sizeof(int));
+    }
     res = knapsackDFSMem(wgt, val, cap + 1, mem, n, cap);
     printf("不超过背包容量的最大物品价值为 %d\n", res);
+    // 释放内存
+    for (int i = 0; i <= n; i++) {
+        free(mem[i]);
+    }
+    free(mem);
 
     // 动态规划
     res = knapsackDP(wgt, val, cap, wgtSize);

codes/c/chapter_dynamic_programming/min_cost_climbing_stairs_dp.c

@@ -7,7 +7,7 @@
 #include "../utils/common.h"
 
 /* 求最小值 */
-int min(int a, int b) {
+int myMin(int a, int b) {
     return a < b ? a : b;
 }
 
@@ -17,15 +17,18 @@ int minCostClimbingStairsDP(int cost[], int costSize) {
     if (n == 1 || n == 2)
         return cost[n];
     // 初始化 dp 表，用于存储子问题的解
-    int dp[n + 1];
+    int *dp = calloc(n + 1, sizeof(int));
     // 初始状态：预设最小子问题的解
     dp[1] = cost[1];
     dp[2] = cost[2];
     // 状态转移：从较小子问题逐步求解较大子问题
     for (int i = 3; i <= n; i++) {
-        dp[i] = min(dp[i - 1], dp[i - 2]) + cost[i];
+        dp[i] = myMin(dp[i - 1], dp[i - 2]) + cost[i];
     }
-    return dp[n];
+    int res = dp[n];
+    // 释放内存
+    free(dp);
+    return res;
 }
 
 /* 爬楼梯最小代价：空间优化后的动态规划 */
@@ -36,7 +39,7 @@ int minCostClimbingStairsDPComp(int cost[], int costSize) {
     int a = cost[1], b = cost[2];
     for (int i = 3; i <= n; i++) {
         int tmp = b;
-        b = min(a, tmp) + cost[i];
+        b = myMin(a, tmp) + cost[i];
         a = tmp;
     }
     return b;
@@ -46,14 +49,8 @@ int minCostClimbingStairsDPComp(int cost[], int costSize) {
 int main() {
     int cost[] = {0, 1, 10, 1, 1, 1, 10, 1, 1, 10, 1};
     int costSize = sizeof(cost) / sizeof(cost[0]);
-    printf("输入楼梯的代价列表为 [");
+    printf("输入楼梯的代价列表为：");
-    for (int i = 0; i < costSize; i++) {
+    printArray(cost, costSize);
-        if (i != costSize - 1)
-            printf("%d, ", cost[i]);
-        else
-            printf("%d", cost[i]);
-    }
-    printf("]\n");
 
     int res = minCostClimbingStairsDP(cost, costSize);
     printf("爬完楼梯的最低代价为 %d\n", res);

codes/c/chapter_dynamic_programming/min_path_sum.c

@@ -6,13 +6,16 @@
 
 #include "../utils/common.h"
 
+// 假设矩阵最大行列数为 100
+#define MAX_SIZE 100
+
 /* 求最小值 */
-int min(int a, int b) {
+int myMin(int a, int b) {
     return a < b ? a : b;
 }
 
 /* 最小路径和：暴力搜索 */
-int minPathSumDFS(int gridCols, int grid[][gridCols], int i, int j) {
+int minPathSumDFS(int grid[MAX_SIZE][MAX_SIZE], int i, int j) {
     // 若为左上角单元格，则终止搜索
     if (i == 0 && j == 0) {
         return grid[0][0];
@@ -22,14 +25,14 @@ int minPathSumDFS(int gridCols, int grid[][gridCols], int i, int j) {
         return INT_MAX;
     }
     // 计算从左上角到 (i-1, j) 和 (i, j-1) 的最小路径代价
-    int up = minPathSumDFS(gridCols, grid, i - 1, j);
+    int up = minPathSumDFS(grid, i - 1, j);
-    int left = minPathSumDFS(gridCols, grid, i, j - 1);
+    int left = minPathSumDFS(grid, i, j - 1);
     // 返回从左上角到 (i, j) 的最小路径代价
-    return min(left, up) != INT_MAX ? min(left, up) + grid[i][j] : INT_MAX;
+    return myMin(left, up) != INT_MAX ? myMin(left, up) + grid[i][j] : INT_MAX;
 }
 
 /* 最小路径和：记忆化搜索 */
-int minPathSumDFSMem(int gridCols, int grid[][gridCols], int mem[][gridCols], int i, int j) {
+int minPathSumDFSMem(int grid[MAX_SIZE][MAX_SIZE], int mem[MAX_SIZE][MAX_SIZE], int i, int j) {
     // 若为左上角单元格，则终止搜索
     if (i == 0 && j == 0) {
         return grid[0][0];
@@ -43,17 +46,20 @@ int minPathSumDFSMem(int gridCols, int grid[][gridCols], int mem[][gridCols], in
         return mem[i][j];
     }
     // 左边和上边单元格的最小路径代价
-    int up = minPathSumDFSMem(gridCols, grid, mem, i - 1, j);
+    int up = minPathSumDFSMem(grid, mem, i - 1, j);
-    int left = minPathSumDFSMem(gridCols, grid, mem, i, j - 1);
+    int left = minPathSumDFSMem(grid, mem, i, j - 1);
     // 记录并返回左上角到 (i, j) 的最小路径代价
-    mem[i][j] = min(left, up) != INT_MAX ? min(left, up) + grid[i][j] : INT_MAX;
+    mem[i][j] = myMin(left, up) != INT_MAX ? myMin(left, up) + grid[i][j] : INT_MAX;
     return mem[i][j];
 }
 
 /* 最小路径和：动态规划 */
-int minPathSumDP(int gridCols, int grid[][gridCols], int n, int m) {
+int minPathSumDP(int grid[MAX_SIZE][MAX_SIZE], int n, int m) {
     // 初始化 dp 表
-    int dp[n][m];
+    int **dp = malloc(n * sizeof(int *));
+    for (int i = 0; i < n; i++) {
+        dp[i] = calloc(m, sizeof(int));
+    }
     dp[0][0] = grid[0][0];
     // 状态转移：首行
     for (int j = 1; j < m; j++) {
@@ -66,16 +72,21 @@ int minPathSumDP(int gridCols, int grid[][gridCols], int n, int m) {
     // 状态转移：其余行列
     for (int i = 1; i < n; i++) {
         for (int j = 1; j < m; j++) {
-            dp[i][j] = min(dp[i][j - 1], dp[i - 1][j]) + grid[i][j];
+            dp[i][j] = myMin(dp[i][j - 1], dp[i - 1][j]) + grid[i][j];
         }
     }
-    return dp[n - 1][m - 1];
+    int res = dp[n - 1][m - 1];
+    // 释放内存
+    for (int i = 0; i < n; i++) {
+        free(dp[i]);
+    }
+    return res;
 }
 
 /* 最小路径和：空间优化后的动态规划 */
-int minPathSumDPComp(int gridCols, int grid[][gridCols], int n, int m) {
+int minPathSumDPComp(int grid[MAX_SIZE][MAX_SIZE], int n, int m) {
     // 初始化 dp 表
-    int dp[m];
+    int *dp = calloc(m, sizeof(int));
     // 状态转移：首行
     dp[0] = grid[0][0];
     for (int j = 1; j < m; j++) {
@@ -87,33 +98,36 @@ int minPathSumDPComp(int gridCols, int grid[][gridCols], int n, int m) {
         dp[0] = dp[0] + grid[i][0];
         // 状态转移：其余列
         for (int j = 1; j < m; j++) {
-            dp[j] = min(dp[j - 1], dp[j]) + grid[i][j];
+            dp[j] = myMin(dp[j - 1], dp[j]) + grid[i][j];
         }
     }
-    return dp[m - 1];
+    int res = dp[m - 1];
+    // 释放内存
+    free(dp);
+    return res;
 }
 
 /* Driver Code */
 int main() {
-    int grid[][4] = {{1, 3, 1, 5}, {2, 2, 4, 2}, {5, 3, 2, 1}, {4, 3, 5, 2}};
+    int grid[MAX_SIZE][MAX_SIZE] = {{1, 3, 1, 5}, {2, 2, 4, 2}, {5, 3, 2, 1}, {4, 3, 5, 2}};
-    int n = sizeof(grid) / sizeof(grid[0]), m = sizeof(grid[0]) / sizeof(grid[0][0]);
+    int n = 4, m = 4; // 矩阵容量为 MAX_SIZE * MAX_SIZE ，有效行列数为 n * m
 
     // 暴力搜索
-    int res = minPathSumDFS(m, grid, n - 1, m - 1);
+    int res = minPathSumDFS(grid, n - 1, m - 1);
     printf("从左上角到右下角的最小路径和为 %d\n", res);
 
     // 记忆化搜索
-    int mem[n][m];
+    int mem[MAX_SIZE][MAX_SIZE];
     memset(mem, -1, sizeof(mem));
-    res = minPathSumDFSMem(m, grid, mem, n - 1, m - 1);
+    res = minPathSumDFSMem(grid, mem, n - 1, m - 1);
     printf("从左上角到右下角的最小路径和为 %d\n", res);
 
     // 动态规划
-    res = minPathSumDP(m, grid, n, m);
+    res = minPathSumDP(grid, n, m);
     printf("从左上角到右下角的最小路径和为 %d\n", res);
 
     // 空间优化后的动态规划
-    res = minPathSumDPComp(m, grid, n, m);
+    res = minPathSumDPComp(grid, n, m);
     printf("从左上角到右下角的最小路径和为 %d\n", res);
 
     return 0;

codes/c/chapter_dynamic_programming/unbounded_knapsack.c

@@ -7,7 +7,7 @@
 #include "../utils/common.h"
 
 /* 求最大值 */
-int max(int a, int b) {
+int myMax(int a, int b) {
     return a > b ? a : b;
 }
 
@@ -15,8 +15,10 @@ int max(int a, int b) {
 int unboundedKnapsackDP(int wgt[], int val[], int cap, int wgtSize) {
     int n = wgtSize;
     // 初始化 dp 表
-    int dp[n + 1][cap + 1];
+    int **dp = malloc((n + 1) * sizeof(int *));
-    memset(dp, 0, sizeof(dp));
+    for (int i = 0; i <= n; i++) {
+        dp[i] = calloc(cap + 1, sizeof(int));
+    }
     // 状态转移
     for (int i = 1; i <= n; i++) {
         for (int c = 1; c <= cap; c++) {
@@ -25,19 +27,23 @@ int unboundedKnapsackDP(int wgt[], int val[], int cap, int wgtSize) {
                 dp[i][c] = dp[i - 1][c];
             } else {
                 // 不选和选物品 i 这两种方案的较大值
-                dp[i][c] = max(dp[i - 1][c], dp[i][c - wgt[i - 1]] + val[i - 1]);
+                dp[i][c] = myMax(dp[i - 1][c], dp[i][c - wgt[i - 1]] + val[i - 1]);
             }
         }
     }
-    return dp[n][cap];
+    int res = dp[n][cap];
+    // 释放内存
+    for (int i = 0; i <= n; i++) {
+        free(dp[i]);
+    }
+    return res;
 }
 
 /* 完全背包：空间优化后的动态规划 */
 int unboundedKnapsackDPComp(int wgt[], int val[], int cap, int wgtSize) {
     int n = wgtSize;
     // 初始化 dp 表
-    int dp[cap + 1];
+    int *dp = calloc(cap + 1, sizeof(int));
-    memset(dp, 0, sizeof(dp));
     // 状态转移
     for (int i = 1; i <= n; i++) {
         for (int c = 1; c <= cap; c++) {
@@ -46,11 +52,14 @@ int unboundedKnapsackDPComp(int wgt[], int val[], int cap, int wgtSize) {
                 dp[c] = dp[c];
             } else {
                 // 不选和选物品 i 这两种方案的较大值
-                dp[c] = max(dp[c], dp[c - wgt[i - 1]] + val[i - 1]);
+                dp[c] = myMax(dp[c], dp[c - wgt[i - 1]] + val[i - 1]);
             }
         }
     }
-    return dp[cap];
+    int res = dp[cap];
+    // 释放内存
+    free(dp);
+    return res;
 }
 
 /* Driver code */

codes/c/chapter_greedy/CMakeLists.txt

@@ -2,4 +2,7 @@ add_executable(coin_change_greedy coin_change_greedy.c)
 add_executable(fractional_knapsack fractional_knapsack.c)
 add_executable(max_capacity max_capacity.c)
 add_executable(max_product_cutting max_product_cutting.c)
+
+if (NOT CMAKE_C_COMPILER_ID STREQUAL "MSVC")
     target_link_libraries(max_product_cutting m)
+endif()

codes/c/chapter_greedy/max_capacity.c

@@ -6,8 +6,14 @@
 
 #include "../utils/common.h"
 
-#define MIN(a, b) (a < b ? a : b)
+/* 求最小值 */
-#define MAX(a, b) (a > b ? a : b)
+int myMin(int a, int b) {
+    return a < b ? a : b;
+}
+/* 求最大值 */
+int myMax(int a, int b) {
+    return a < b ? a : b;
+}
 
 /* 最大容量：贪心 */
 int maxCapacity(int ht[], int htLength) {
@@ -19,8 +25,8 @@ int maxCapacity(int ht[], int htLength) {
     // 循环贪心选择，直至两板相遇
     while (i < j) {
         // 更新最大容量
-        int capacity = MIN(ht[i], ht[j]) * (j - i);
+        int capacity = myMin(ht[i], ht[j]) * (j - i);
-        res = MAX(res, capacity);
+        res = myMax(res, capacity);
         // 向内移动短板
         if (ht[i] < ht[j]) {
             i++;

codes/c/chapter_heap/top_k.c

@@ -38,7 +38,7 @@ int *getMinHeap(MaxHeap *maxHeap) {
 int *topKHeap(int *nums, int sizeNums, int k) {
     // 初始化小顶堆
     // 请注意：我们将堆中所有元素取反，从而用大顶堆来模拟小顶堆
-    int empty[0];
+    int *empty = (int *)malloc(0);
     MaxHeap *maxHeap = newMaxHeap(empty, 0);
     // 将数组的前 k 个元素入堆
     for (int i = 0; i < k; i++) {

codes/c/chapter_stack_and_queue/array_deque.c

@@ -111,16 +111,6 @@ int popLast(ArrayDeque *deque) {
     return num;
 }
 
-/* 打印队列 */
-void printArrayDeque(ArrayDeque *deque) {
-    int arr[deque->queSize];
-    // 拷贝
-    for (int i = 0, j = deque->front; i < deque->queSize; i++, j++) {
-        arr[i] = deque->nums[j % deque->queCapacity];
-    }
-    printArray(arr, deque->queSize);
-}
-
 /* Driver Code */
 int main() {
     /* 初始化队列 */
@@ -130,7 +120,7 @@ int main() {
     pushLast(deque, 2);
     pushLast(deque, 5);
     printf("双向队列 deque = ");
-    printArrayDeque(deque);
+    printArray(deque->nums, deque->queSize);
 
     /* 访问元素 */
     int peekFirstNum = peekFirst(deque);
@@ -141,18 +131,18 @@ int main() {
     /* 元素入队 */
     pushLast(deque, 4);
     printf("元素 4 队尾入队后 deque = ");
-    printArrayDeque(deque);
+    printArray(deque->nums, deque->queSize);
     pushFirst(deque, 1);
     printf("元素 1 队首入队后 deque = ");
-    printArrayDeque(deque);
+    printArray(deque->nums, deque->queSize);
 
     /* 元素出队 */
     int popLastNum = popLast(deque);
     printf("队尾出队元素 = %d ，队尾出队后 deque= ", popLastNum);
-    printArrayDeque(deque);
+    printArray(deque->nums, deque->queSize);
     int popFirstNum = popFirst(deque);
     printf("队首出队元素 = %d ，队首出队后 deque= ", popFirstNum);
-    printArrayDeque(deque);
+    printArray(deque->nums, deque->queSize);
 
     /* 获取队列的长度 */
     int dequeSize = size(deque);

codes/c/chapter_stack_and_queue/array_queue.c

@@ -73,16 +73,6 @@ void pop(ArrayQueue *queue) {
     queue->queSize--;
 }
 
-/* 打印队列 */
-void printArrayQueue(ArrayQueue *queue) {
-    int arr[queue->queSize];
-    // 拷贝
-    for (int i = 0, j = queue->front; i < queue->queSize; i++, j++) {
-        arr[i] = queue->nums[j % queue->queCapacity];
-    }
-    printArray(arr, queue->queSize);
-}
-
 /* Driver Code */
 int main() {
     /* 初始化队列 */
@@ -96,7 +86,7 @@ int main() {
     push(queue, 5);
     push(queue, 4);
     printf("队列 queue = ");
-    printArrayQueue(queue);
+    printArray(queue->nums, queue->queSize);
 
     /* 访问队首元素 */
     int peekNum = peek(queue);
@@ -105,7 +95,7 @@ int main() {
     /* 元素出队 */
     pop(queue);
     printf("出队元素 pop = %d ，出队后 queue = ", peekNum);
-    printArrayQueue(queue);
+    printArray(queue->nums, queue->queSize);
 
     /* 获取队列的长度 */
     int queueSize = size(queue);
@@ -120,7 +110,7 @@ int main() {
         push(queue, i);
         pop(queue);
         printf("第 %d 轮入队 + 出队后 queue = ", i);
-        printArrayQueue(queue);
+        printArray(queue->nums, queue->queSize);
     }
 
     // 释放内存

codes/c/chapter_stack_and_queue/linkedlist_deque.c

@@ -153,7 +153,7 @@ int popLast(LinkedListDeque *deque) {
 
 /* 打印队列 */
 void printLinkedListDeque(LinkedListDeque *deque) {
-    int arr[deque->queSize];
+    int *arr = malloc(sizeof(int) * deque->queSize);
     // 拷贝链表中的数据到数组
     int i;
     DoublyListNode *node;
@@ -162,6 +162,7 @@ void printLinkedListDeque(LinkedListDeque *deque) {
         node = node->next;
     }
     printArray(arr, deque->queSize);
+    free(arr);
 }
 
 /* Driver Code */

codes/c/chapter_stack_and_queue/linkedlist_queue.c

@@ -77,7 +77,7 @@ void pop(LinkedListQueue *queue) {
 
 /* 打印队列 */
 void printLinkedListQueue(LinkedListQueue *queue) {
-    int arr[queue->queSize];
+    int *arr = malloc(sizeof(int) * queue->queSize);
     // 拷贝链表中的数据到数组
     int i;
     ListNode *node;
@@ -86,6 +86,7 @@ void printLinkedListQueue(LinkedListQueue *queue) {
         node = node->next;
     }
     printArray(arr, queue->queSize);
+    free(arr);
 }
 
 /* Driver Code */

codes/c/utils/print_util.h

@@ -19,49 +19,33 @@ extern "C" {
 #endif
 
 /* Print an Array */
-static void printArray(int arr[], int size) {
+void printArray(int arr[], int size) {
+    if (arr == NULL || size == 0) {
+        printf("[]");
+        return;
+    }
     printf("[");
-    if (arr != NULL && size != 0) {
     for (int i = 0; i < size - 1; i++) {
-            if (arr[i] != INT_MAX) {
         printf("%d, ", arr[i]);
-            } else {
-                printf("NULL, ");
     }
-        }
-        if (arr[size - 1] != INT_MAX) {
     printf("%d]\n", arr[size - 1]);
-        } else {
-            printf("NULL]\n");
-        }
-    } else {
-        printf("]\n");
-    }
 }
 
 /* Print an Array */
-static void printArrayFloat(float arr[], int size) {
+void printArrayFloat(float arr[], int size) {
+    if (arr == NULL || size == 0) {
+        printf("[]");
+        return;
+    }
     printf("[");
-    if (arr != NULL && size != 0) {
     for (int i = 0; i < size - 1; i++) {
-            if (arr[i] != INT_MAX) {
         printf("%.2f, ", arr[i]);
-            } else {
-                printf("NULL, ");
     }
-        }
-        if (arr[size - 1] != INT_MAX) {
     printf("%.2f]\n", arr[size - 1]);
-        } else {
-            printf("NULL]\n");
-        }
-    } else {
-        printf("]");
-    }
 }
 
 /* Print a linked list */
-static void printLinkedList(ListNode *node) {
+void printLinkedList(ListNode *node) {
     if (node == NULL) {
         return;
     }
@@ -95,7 +79,7 @@ void showTrunks(Trunk *trunk) {
 }
 
 /* Help to print a binary tree, hide more details */
-static void printTreeHelper(TreeNode *node, Trunk *prev, bool isRight) {
+void printTreeHelper(TreeNode *node, Trunk *prev, bool isRight) {
     if (node == NULL) {
         return;
     }
@@ -123,12 +107,12 @@ static void printTreeHelper(TreeNode *node, Trunk *prev, bool isRight) {
 }
 
 /* Print a binary tree */
-static void printTree(TreeNode *root) {
+void printTree(TreeNode *root) {
     printTreeHelper(root, NULL, false);
 }
 
 /* Print a Heap */
-static void printHeap(int arr[], int size) {
+void printHeap(int arr[], int size) {
     TreeNode *root;
     printf("堆的数组表示：");
     printArray(arr, size);

codes/cpp/chapter_backtracking/preorder_traversal_i_compact.cpp

@@ -9,7 +9,7 @@
 vector<TreeNode *> res;
 
 /* 前序遍历：例题一 */
-static void preOrder(TreeNode *root) {
+void preOrder(TreeNode *root) {
     if (root == nullptr) {
         return;
     }

codes/cpp/chapter_backtracking/preorder_traversal_ii_compact.cpp

@@ -10,7 +10,7 @@ vector<TreeNode *> path;
 vector<vector<TreeNode *>> res;
 
 /* 前序遍历：例题二 */
-static void preOrder(TreeNode *root) {
+void preOrder(TreeNode *root) {
     if (root == nullptr) {
         return;
     }