NA (score:50%)

有人可以幫忙一下嗎，一直卡在記憶體錯誤，應該是讀到陣列外面去了，但是檢查dfs應該又沒問題

#include<stdio.h>

#include<string.h>

char arr[251][251], color, cmd, old, name[100], garbage[100];

int m, n, x1, y1, x2, y2;

void dfs(int x, int y){

if (y < 0 || y >= n || x < 0 || x >= m || arr[y][x] != old) return;

arr[y][x] = color;

dfs(x, y - 1);

dfs(x - 1, y);

dfs(x, y + 1);

dfs(x + 1, y);

}

void swap(int *a, int *b){

int temp;

temp = *a;

*a = *b;

*b = temp;

}

int main(){

while (1){

scanf(" %c", &cmd);

if (cmd == 'I'){

scanf(" %d %d", &m, &n);

memset(arr, 'O', sizeof(arr));

}

else if (cmd == 'C') memset(arr, 'O', sizeof(arr));

else if (cmd == 'L'){

scanf(" %d %d %c", &x1, &y1, &color);

arr[y1 - 1][x1 - 1] = color;

}

else if (cmd == 'V'){

scanf(" %d %d %d %c", &x1, &y1, &y2, &color);

if (y1 > y2) swap(&y1, &y2);

for (int i = y1 - 1; i < y2; i++){

arr[i][x1 - 1] = color;

}

}

else if (cmd == 'H'){

scanf(" %d %d %d %c", &x1, &x2, &y1, &color);

if (x1 > x2) swap(&x1, &x2);

for (int i = x1 - 1; i < x2; i++){

arr[y1 - 1][i] = color;

}

}

else if (cmd == 'K'){

scanf(" %d %d %d %d %c", &x1, &y1, &x2, &y2, &color);

if (y1 > y2) swap(&y1, &y2);

if (x1 > x2) swap(&x1, &x2);

for (int i = y1 - 1; i < y2; i++){

for (int j = x1 - 1; j < x2; j++){

arr[i][j] = color;

}

}

}

else if (cmd == 'F'){

scanf(" %d %d %c", &x1, &y1, &color);

x1--; y1--;

if (y1 < 0 || y1 >= n || x1 < 0 || x1 >= m) continue;

old = arr[y1][x1];

dfs(x1, y1);

}

else if (cmd == 'S'){

scanf(" %s", &name);

puts(name);

for (int i = 0; i < n; i++){

for (int j = 0; j < m; j++){

putchar(arr[i][j]);

}

putchar('\n');

}

}

else if (cmd == 'X') return 0;

else gets(garbage);

}

}