Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:62:23: warning: variable ‘ab’ set but not used [-Wunused-but-set-variable] pair<int, int>ab = {it, nod}; ^~ user.cpp: In function ‘int main()’: user.cpp:109:36: 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); ^ user.cpp:110:38: 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); ^ user.cpp:113:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ user.cpp:115:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d ", &n, &m); ^ user.cpp:117:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", a[i] + 1); ^