Compilare: user.cpp: In function ‘void sterge(int, int)’: user.cpp:37:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[x].size(); ++i) ^ user.cpp: In function ‘void Afis()’: user.cpp:89:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < v[x].size(); ++j) ^ user.cpp:100:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < v[y].size(); ++j) ^ user.cpp: In function ‘int main()’: user.cpp:116:16: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(In); ^ user.cpp:117:17: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(Out); ^ user.cpp:118:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:120:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^