Compilare: user.cpp: In function ‘void sterge(int, int)’: user.cpp:15:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v[x].size(); ++i) ^ user.cpp: In function ‘int muchie_intoarcere(int)’: user.cpp:27:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v[n].size(); ++i) ^ user.cpp:30:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v[n].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:57:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ciclueuler.in","r",stdin); ^ user.cpp:58:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ciclueuler.out","w",stdout); ^ user.cpp:62:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:66:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^