Compilare: user.cpp: In function ‘int main()’: user.cpp:37:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cobai.in", "r", stdin); ^ user.cpp:38:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cobai.out", "w", stdout); ^ user.cpp:39:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:41:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s[i] + 1); ^ user.cpp:47:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", cr + 1); ^ user.cpp:56:29: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] q.push({l + dx[k[1]], c + dy[k[1]], 1}); ~~^~~~~~~~~~ user.cpp:56:15: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized] q.push({l + dx[k[1]], c + dy[k[1]], 1}); ~~^~~~~~~~~~