Compilare: user.cpp: In function ‘int main()’: user.cpp:17:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<Hash[r].size() && ok==0; i++) ^ user.cpp:12:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:14:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &op, &nr); ^