Compilare: user.cpp: In function ‘int main()’: user.cpp:37:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < adiacente[p].size(); i ++) { ^ user.cpp:45:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < roads[adiacente[p][i]].size(); j ++) ^ user.cpp:56:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < roads[y].size(); i ++) ^ user.cpp:16:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("graf.in", "r", stdin); ^ user.cpp:17:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("graf.out", "w", stdout); ^ user.cpp:19:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &n, &m, &x, &y); ^ user.cpp:22:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n1, &n2); ^