Compilare: user.cpp: In function ‘void introduce_in_apm(int)’: user.cpp:12:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Q[x].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:107:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<Q[x].size();++j) ^ user.cpp:116:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(unsigned int i=0;i<n-1;++i) ^ user.cpp: In function ‘void citire()’: user.cpp:65:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.in","r",stdin); ^ user.cpp:66:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.out","w",stdout); ^ user.cpp:67:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n",&n,&m); ^ user.cpp:71:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&x,&y,&c); ^