Compilare: user.cpp: In function ‘double solve(int, int)’: user.cpp:38:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < pts1.size(); i++) ^ user.cpp:39:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i + 1; j < pts1.size() && j <= i + 7; j++) ^ user.cpp: In function ‘int main()’: user.cpp:49:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&n); ^ user.cpp:51:51: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%lf %lf " ,&pts[i].x,&pts[i].y); ^