Compilare: user.cpp: In function ‘int main()’: user.cpp:35:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<O.size();++i) ^ user.cpp:36:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<V.size();++j) ^ user.cpp:50:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0,res=INT_MAX;i<O.size();++i) ^ user.cpp:51:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (_i=i+1;_i<O.size();++_i) ^ user.cpp:53:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0,MIN.F=MIN.S=INT_MAX;j<V.size();++j) ^ user.cpp:23:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("segmente.in","r",stdin); ^ user.cpp:24:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("segmente.out","w",stdout); ^ user.cpp:26:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (i=1,scanf("%d",&N);i<=N;++i) ^ user.cpp:28:50: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&P.F.F,&P.F.S,&P.S.F,&P.S.S); ^