Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:39:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < l[v].size(); i++){ ^ user.cpp: In function ‘void EraseEdge(int, int)’: user.cpp:47:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < l[w].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:16:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ciclueuler.in", "r", stdin); ^ user.cpp:17:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ciclueuler.out", "w", stdout); ^ user.cpp:18:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:20:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^