Compilare: user.cpp: In function ‘int Find(int, int)’: user.cpp:42:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(H[indexProd].size() <cate)return -1; ^ user.cpp: In function ‘void ReadThemAll()’: user.cpp:31:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &N); ^ user.cpp:34:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &x); ^ user.cpp: In function ‘void Answer()’: user.cpp:55:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&Q); ^ user.cpp:59:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&x,&y); ^