baoshuo/OI-codes
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D - Black and White Tree

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https://atcoder.jp/contests/agc014/submissions/26377341
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Baoshuo Ren 2021-10-06 10:07:21 +08:00 committed by Baoshuo Ren
parent 02ed7be7c2
commit 4919169d97
Signed by: baoshuo
GPG Key ID: 70F90A673FB1AB68
1 changed files with 33 additions and 0 deletions
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AtCoder/AGC014/D/D.cpp Normal file
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#include <bits/stdc++.h>
using namespace std;
int n, u, v;
vector<int> g[100005];
bool flag, vis[100005];
void dfs(int u, int f) {
if (flag) return;
for (int i : g[u]) {
if (i != f) dfs(i, u);
}
if (!vis[u]) {
if (f == -1 || vis[f]) {
flag = true;
} else {
vis[f] = vis[u] = true;
}
}
}
int main() {
cin >> n;
for (int i = 1; i < n; i++) {
cin >> u >> v;
g[u].push_back(v);
g[v].push_back(u);
}
dfs(1, -1);
cout << (flag ? "First" : "Second") << endl;
return 0;
}