Compilare: user.cpp: In function ‘void dfs(short int)’: user.cpp:22:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < adj[u].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:34:26: warning: unused variable ‘wg’ [-Wunused-variable] short n, k, i, u, v, wg; ^ user.cpp:31:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cezar.in", "r", stdin); ^ user.cpp:32:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cezar.out", "w", stdout); ^ user.cpp:37:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%hd %hd", &n, &k); ^ user.cpp:39:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%hd %hd", &u, &v); ^