Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:22:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[ind][node].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:63:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < ctc.size(); ++i) ^ user.cpp:43:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ctc.in","r",stdin); ^ user.cpp:44:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ctc.out","w",stdout); ^ user.cpp:46:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (scanf("%d %d", &n, &m); m; --m) ^ user.cpp:48:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^