Compilare: main.cpp: In function 'int main()': main.cpp:84:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < sz; ++ j) if (sz <= V[V[i][j]].size()) ~~~^~~~~~~~~~~~~~~~~~~~ main.cpp:47:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &m, &k); ^ main.cpp:51:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &tribe[i]); ^ main.cpp:56:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &u, &v); ^