Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:45:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < V[k].size() ; i++) ^ user.cpp: In function ‘void citire()’: user.cpp:31:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dfs.in", "r", stdin); ^ user.cpp:32:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d %d", &n, &m); ^ user.cpp:35:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d %d", &x, &y ); ^