Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:123:23: warning: variable 'ab' set but not used [-Wunused-but-set-variable] pair<int, int>ab = {it, nod}; ^~ main.cpp: In function 'int main()': main.cpp:217:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sokoban.in", "r", stdin); ^ main.cpp:219:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sokoban.out", "w", stdout); ^ main.cpp:225:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ main.cpp:229:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d ", &n, &m); ^ main.cpp:233:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", a[i] + 1); ^