Compilare: user.cpp: In function ‘void solve()’: user.cpp:106:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (LINK_SUPERZONE[i].size() < k) ^ user.cpp:122:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (LINK_SUPERZONE[*it].size() < k && !viz[*it]) ^ user.cpp: In function ‘void read()’: user.cpp:26:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &m ,&k); ^ user.cpp:30:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", v[i] + 1); ^