Compilare: user.cpp: In function ‘void f_hash(int, int)’: user.cpp:42:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<hashh[a].size(); ++i) ^ user.cpp:51:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<hashh[a].size(); ++i) ^ user.cpp: In function ‘void read()’: user.cpp:26:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:28:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &a, &b); ^