Compilare: user.cpp: In function ‘int main()’: user.cpp:53:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<componenta.size(); j++) ^ user.cpp:137:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<answer.size(); i++) ^ user.cpp:140:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<answer[i].size(); j++) ^ user.cpp:32:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("johnie.in", "r", stdin); ^ user.cpp:33:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("johnie.out", "w", stdout); ^ user.cpp:34:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &N, &M); ^ user.cpp:39:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &X, &Y); ^