Compilare: user.cpp: In function ‘int main()’: user.cpp:51:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(it[node] < graph[node].size() && vis[graph[node][ it[node] ]]) ^ user.cpp:57:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(used[dad] == graph[dad].size() - 1) ^ user.cpp:25:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cezar.in", "r", stdin); ^ user.cpp:26:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cezar.out", "w", stdout); ^ user.cpp:29:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^ user.cpp:32:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^