제출 #32315

#제출 시각아이디문제언어결과실행 시간메모리
32315dqhungdlNetwork (BOI15_net)C++14
18 / 100
3 ms14380 KiB
#include <bits/stdc++.h> using namespace std; int n; bool Free[500005]; vector<int> V,g[500005]; void DFS(int u) { Free[u]=true; if(g[u].size()==1) V.push_back(u); for(int i=0;i<g[u].size();i++) if(Free[g[u][i]]==false) DFS(g[u][i]); } int main() { ios_base::sync_with_stdio(false); //freopen("NET.INP","r",stdin); cin>>n; int u,v; for(int i=1;i<n;i++) { cin>>u>>v; g[u].push_back(v); g[v].push_back(u); } DFS(1); int res=(V.size()+1)/2; cout<<res<<"\n"; for(int i=0;i<res;i++) if(i+V.size()/2<V.size()) cout<<V[i]<<' '<<V[i+V.size()/2]<<"\n"; }

컴파일 시 표준 에러 (stderr) 메시지

net.cpp: In function 'void DFS(int)':
net.cpp:13:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<g[u].size();i++)
                  ^
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