Compilare: main.cpp: In function 'int main()': main.cpp:23:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v.size();i++) ~^~~~~~~~~ main.cpp:24:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i;j<v.size();j++){ ~^~~~~~~~~ main.cpp:28:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(d1%2==b%2&&d2%2==b%2){ ~~~~^~~~~ main.cpp:28:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(d1%2==b%2&&d2%2==b%2){ ~~~~^~~~~ main.cpp:34:26: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::set<std::pair<long long unsigned int, long long unsigned int> >::size_type {aka long unsigned int}' [-Wformat=] printf("%d\n",s.size()); ^ main.cpp:12:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("armonica.in","r",stdin); ^ main.cpp:13:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("armonica.out","w",stdout); ^ main.cpp:14:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&b); ^