Compilare: user.cpp: In function ‘int main()’: user.cpp:52:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(it[node] < graph[node].size() && vis[graph[node][ it[node] ]]) ^ user.cpp:58:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(used[dad] == graph[dad].size() - 1) ^ user.cpp:26:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cezar1.in", "r", stdin); ^ user.cpp:27:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cezar1.out", "w", stdout); ^ user.cpp:30:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^ user.cpp:33:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^