Compilare: user.cpp: In function ‘int main()’: user.cpp:55:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int p = 0; p < K[j].size(); ++ p) ^ user.cpp:28:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &a, &b); ^