Compilare: user.cpp: In function ‘void solve(int)’: user.cpp:54:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<vecin[nod].size();i++){ ^ user.cpp:58:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<aux.size();i++){ ^ user.cpp:60:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+1;j<aux.size();j++){ ^ user.cpp:67:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<aux.size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:76:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("tric.in","r",stdin); ^ user.cpp:77:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("tric.out","w",stdout); ^ user.cpp:80:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d",&n,&m); ^ user.cpp:83:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d",&x,&y); ^