Compilare: user.cpp: In function ‘int main()’: user.cpp:39:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<bands.size();i++) ^ user.cpp:43:68: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((bands[i]<=P[j].first&&P[j].first<=(i==bands.size()-1 ? 10000000:bands[i+1]))||(bands[i]<=P[j%N+1].first&&P[j%N+1].first<=(i==bands.size()-1 ? 10000000:bands[i+1]))) ^ user.cpp:43:155: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((bands[i]<=P[j].first&&P[j].first<=(i==bands.size()-1 ? 10000000:bands[i+1]))||(bands[i]<=P[j%N+1].first&&P[j%N+1].first<=(i==bands.size()-1 ? 10000000:bands[i+1]))) ^ user.cpp:32:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&N,&M); ^ user.cpp:35:51: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&P[i].first,&P[i].second); ^ user.cpp:52:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&x,&y); ^