/in/foo.cc: In function 'bool dfs(int)':
/in/foo.cc:18:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<g[u].size();i++)
                 ~^~~~~~~~~~~~
/in/foo.cc: In function 'int hungary()':
/in/foo.cc:37:28: error: 'memset' was not declared in this scope
     memset(cx,-1,sizeof(cx));
                            ^