Compilare: user.cpp: In function ‘void bfs(int, int)’: user.cpp:33:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < V[v].size(); ++ j) ^ user.cpp: In function ‘int main()’: user.cpp:116:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &n, &m, &s, &d); ^ user.cpp:120:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &x, &y, &c); ^