Compilare: main.cpp: In function 'void dfs(int)': main.cpp:10:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<l[x].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:24:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(i=1;i<=n;i++) ^~~ main.cpp:26:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' reverse(c.begin(),c.end()); ^~~~~~~ main.cpp:27:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<c.size();++i) ~^~~~~~~~~ main.cpp:17:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sortaret.in","r",stdin); ^ main.cpp:18:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sortaret.out","w",stdout); ^ main.cpp:19:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ main.cpp:21:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^