Compilare: user.cpp: In function ‘int main()’: user.cpp:37:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int j=0;j<v[i].size();++j ){ ^ user.cpp:25:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&n,&l,&e); ^ user.cpp:28:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&x,&y); ^