Compilare: user.cpp: In function ‘void dfs(int, int, int)’: user.cpp:35:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < v[node].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:70:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < result[a].size(); ++j) ^ user.cpp:51:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("avioane2.in", "r", stdin); ^ user.cpp:52:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("avioane2.out", "w", stdout); ^ user.cpp:53:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &m, &k); ^ user.cpp:56:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d", &x, &a, &y, &b, &c); ^ user.cpp:68:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a, &b); ^