Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:25:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < graph[node].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:53:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < nivele[i].size(); ++j) ^ user.cpp:34:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nivele2.in", "r", stdin); ^ user.cpp:35:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nivele2.out", "w", stdout); ^ user.cpp:37:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &nrMuchii); ^ user.cpp:43:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &start, &endd); ^