Compilare: user.cpp: In function ‘int main()’: user.cpp:35:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<frig.size();j++) ^ user.cpp:42:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ok==frig.size()) {frig.push_back(make_pair(mn,mx));} ^ user.cpp:18:15: warning: unused variable ‘m’ [-Wunused-variable] int n,i,j,m,mn,mx,MIN,MAX,ok; ^ user.cpp:20:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("reactivi.in","r",stdin); ^ user.cpp:21:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("reactivi.out","w",stdout); ^ user.cpp:22:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:25:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&mn,&mx); ^