Compilare: user.cpp: In function ‘int main()’: user.cpp:21:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v.size();i++) ^ user.cpp:22:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i;j<v.size();j++){ ^ user.cpp:25:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(d1%2==b%2&&d2%2==b%2){ ^ user.cpp:25:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(d1%2==b%2&&d2%2==b%2){ ^ user.cpp:11:36: 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); ^ user.cpp:12:38: 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); ^ user.cpp:13:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&b); ^