Compilare: user.cpp: In function ‘void dfs(int, int, int)’: user.cpp:39:39: 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:78:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < bc.size();i++) ^ user.cpp:82:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0 ; j < bc[i].size(); j++) ^ user.cpp:64:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("biconex.in", "r", stdin); ^ user.cpp:65:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("biconex.out", "w", stdout); ^ user.cpp:66:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:72:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &x, &y); ^