Compilare: user.cpp: In function ‘int main()’: user.cpp:46:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < pts[cnt].size(); i++) ^ user.cpp:48:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int nod = 0; nod < pts[cnt].size(); nod++) { ^ user.cpp:50:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < pts[cnt - 1].size(); i++) ^ user.cpp:70:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < pts[cnt].size(); i++) ^ user.cpp:74:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < pts[cnt].size(); i++) ^ user.cpp:33:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&t); ^ user.cpp:41:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d " ,&x,&y); ^