Compilare: user.cpp: In function ‘void dfs(std::vector<bool>&, std::vector<char>&, std::vector<std::vector<int> >&, int, int, int)’: user.cpp:14:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < adiacente[left].size(); i ++) { ^ user.cpp:20:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < adiacente[right].size(); i ++) { ^ user.cpp: In function ‘int main()’: user.cpp:69:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < sol.size(); j ++) { ^ user.cpp:39:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbpal.in", "r", stdin); ^ user.cpp:40:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbpal.out", "w", stdout); ^ user.cpp:43:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:49:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &a, &b); ^ user.cpp:58:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &vals[i]); ^