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QOJ
ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#97787 | #6307. Chase Game 2 | krito2023# | WA | 70ms | 5800kb | C++20 | 1.5kb | 2023-04-18 15:23:26 | 2023-04-18 15:23:30 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int N = 1e5 + 10;
vector<int> eg[N];
int siz[N], deg[N];
void dfs(int u, int p) {
if(eg[u].size() == 1) siz[p] ++;
for(auto v : eg[u]) {
if(v == p) continue;
dfs(v, u);
}
}
void solve() {
int n;
cin >> n;
for(int i = 0; i<= n; i ++) eg[i].clear(), deg[i] = siz[i] = 0;
for(int i = 1; i < n; i ++) {
int x, y;
cin >> x >> y;
eg[x].push_back(y);
eg[y].push_back(x);
deg[x] ++, deg[y] ++;
}
if(n == 2) {
cout << -1 << "\n";
return;
}
int s;
for(int i = 1; i <= n; i ++) {
if(deg[i] >= 2) {
s = i;
break;
}
}
dfs(s, 0);
vector<int> res;
for(int i = 1; i <= n; i ++) {
if(siz[i]) res.push_back(siz[i]);
}
sort(res.begin(), res.end());
reverse(res.begin(), res.end());
ll ans = 0;
if(res.size() == 1) {
cout << -1 << "\n";
return;
}
int now = res[0];
for(int i = 1; i < res.size(); i ++) {
if(now >= res[i]) {
now -= res[i];
ans += res[i];
} else {
res[i] -= now;
ans += now;
now = res[i];
}
}
cout << ans + now << "\n";
}
void ddd() {
int n;
cin >> n;
int ans = 0;
vector<int> res(n + 1);
for(int i = 0; i < n; i ++) res[i] = n - i;
int now = res[0];
for(int i = 1; i < n; i ++) {
if(now >= res[i]) {
now -= res[i];
ans += res[i];
} else {
res[i] -= now;
ans += now;
now = res[i];
}
}
cout << ans + now << "\n";
}
int main() {
int t;
// ddd();
cin >> t;
while(t --) solve();
}
詳細信息
Test #1:
score: 100
Accepted
time: 1ms
memory: 5652kb
input:
4 2 1 2 4 1 2 2 3 3 4 4 1 2 2 3 2 4 5 1 2 2 3 3 4 3 5
output:
-1 1 -1 2
result:
ok 4 number(s): "-1 1 -1 2"
Test #2:
score: 0
Accepted
time: 22ms
memory: 5624kb
input:
10000 4 1 2 1 3 3 4 4 1 2 1 3 1 4 4 1 2 2 3 1 4 5 1 2 2 3 1 4 4 5 5 1 2 2 3 3 4 4 5 4 1 2 2 3 2 4 5 1 2 1 3 2 4 2 5 4 1 2 2 3 1 4 5 1 2 1 3 2 4 1 5 5 1 2 2 3 3 4 2 5 5 1 2 1 3 2 4 2 5 4 1 2 1 3 3 4 5 1 2 1 3 3 4 1 5 4 1 2 1 3 1 4 5 1 2 1 3 3 4 3 5 5 1 2 2 3 3 4 3 5 4 1 2 1 3 2 4 5 1 2 2 3 2 4 3 5 5 ...
output:
1 -1 1 1 1 -1 2 1 2 2 2 1 2 -1 2 2 1 2 2 1 1 1 -1 2 2 2 1 -1 1 1 2 1 1 -1 1 2 1 1 1 -1 1 1 2 2 2 1 1 1 -1 1 2 1 1 2 1 2 1 1 2 -1 -1 -1 2 2 2 1 1 1 2 2 2 -1 1 2 -1 1 1 -1 2 -1 -1 1 2 2 2 1 1 1 1 1 1 1 1 1 2 -1 1 1 2 -1 2 1 1 1 -1 2 -1 1 -1 -1 2 -1 2 1 2 2 1 1 1 1 2 1 1 1 1 -1 2 1 2 1 1 1 1 1 1 1 2 -1...
result:
ok 10000 numbers
Test #3:
score: -100
Wrong Answer
time: 70ms
memory: 5800kb
input:
10000 9 1 2 2 3 3 4 4 5 1 6 6 7 5 8 7 9 9 1 2 2 3 2 4 1 5 2 6 4 7 6 8 1 9 9 1 2 2 3 1 4 4 5 5 6 4 7 2 8 1 9 10 1 2 2 3 1 4 3 5 3 6 2 7 6 8 6 9 6 10 10 1 2 1 3 3 4 2 5 1 6 5 7 4 8 2 9 7 10 10 1 2 2 3 2 4 1 5 3 6 6 7 5 8 4 9 9 10 9 1 2 2 3 2 4 1 5 3 6 2 7 1 8 2 9 9 1 2 1 3 2 4 1 5 3 6 3 7 7 8 8 9 10 1...
output:
1 3 3 3 2 2 3 2 3 2 3 2 3 2 3 3 3 2 3 2 3 2 3 3 2 2 3 3 3 3 3 3 2 3 3 3 4 3 3 3 2 3 3 3 3 3 2 3 3 3 3 3 3 2 3 2 3 2 2 3 3 4 3 4 3 3 2 2 3 2 2 2 4 3 2 3 3 2 4 3 3 3 2 4 2 2 3 3 3 3 2 3 3 2 3 3 3 3 3 2 3 2 2 3 5 3 3 2 2 3 2 3 4 2 5 3 2 3 3 2 3 2 3 3 3 3 2 2 3 3 3 2 3 3 3 3 3 3 2 3 3 2 2 4 3 3 3 3 2 3 ...
result:
wrong answer 73rd numbers differ - expected: '3', found: '4'