Compilare: user.cpp: In function ‘int main()’: user.cpp:51:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(short j=0;j<gr[i].size();j++) ^ user.cpp:29:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%hd %hd",&N,&K); ^ user.cpp:36:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%hd ",&x); ^