Compilare: user.cpp: In function ‘int main()’: user.cpp:37:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<V.size();i++){ ^ user.cpp:42:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i+1;j<V.size();j++){ ^ user.cpp:17:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&x); ^ user.cpp:22:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&y); ^