Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:12:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v[k].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:38:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v[1].size(); i++) ^ user.cpp:45:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v[1].size(); i++) ^ user.cpp:59:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v[ind1].size(); i++) ^ user.cpp:74:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v[ind2].size(); i++) ^ user.cpp:23:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("darb.in", "r", stdin); ^ user.cpp:24:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("darb.out", "w", stdout); ^ user.cpp:26:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:29:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ user.cpp:55:20: warning: ‘ind1’ may be used uninitialized in this function [-Wmaybe-uninitialized] int hc = h[ind1]; ^ user.cpp:70:17: warning: ‘ind2’ may be used uninitialized in this function [-Wmaybe-uninitialized] hc = h[ind2]; ^