Compilare: user.cpp: In function ‘int main()’: user.cpp:60:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < pret.size(); i ++) ^ user.cpp:77:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < sol[1].size()) ^ user.cpp:85:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j >= sol[0].size()) ^ user.cpp:94:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < sol[1].size(); i ++) ^ user.cpp:43:10: warning: unused variable ‘flag’ [-Wunused-variable] bool flag = 0; ^ user.cpp:44:9: warning: unused variable ‘nr’ [-Wunused-variable] int nr = 0,ans = 0; ^ user.cpp:40:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d%d",&n,&ox,&oy); ^ user.cpp:42:69: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d %d %d",&v[i].sx,&v[i].sy,&v[i].dx,&v[i].dy); ^