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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#757724#9713. Kill the treepropane#WA 67ms31252kbC++201.2kb2024-11-17 12:47:112024-11-17 12:47:13

Judging History

你现在查看的是最新测评结果

  • [2024-11-17 12:47:13]
  • 评测
  • 测评结果:WA
  • 用时:67ms
  • 内存:31252kb
  • [2024-11-17 12:47:11]
  • 提交

answer

#include<iostream>
#include<cstring>
#include<vector>
using namespace std;
using LL = long long;

int main(){

#ifdef LOCAL
    freopen("data.in", "r", stdin);
    freopen("data.out", "w", stdout);
#endif

    cin.tie(0);
    cout.tie(0);
    ios::sync_with_stdio(0);

    int n;
    cin >> n;
    vector<vector<int> > g(n + 1);
    for(int i = 0; i < n - 1; i++){
        int a, b;
        cin >> a >> b;
        g[a].push_back(b);
        g[b].push_back(a);
    }
    vector<int> mx(n + 1), sz(n + 1), ans(n + 1), fa(n + 1);

    auto dfs = [&](auto &&dfs, int u) -> void {
        sz[u] = 1;
        int heavy = 0;
        for(auto j : g[u]){
            if (j == fa[u]) continue;
            fa[j] = u;
            dfs(dfs, j);
            sz[u] += sz[j];
            if (sz[j] > sz[heavy]) heavy = j;
        }
        mx[u] = sz[heavy];
        if (mx[u] * 2 <= sz[u]){
            ans[u] = u;
        }
        else{
            ans[u] = ans[heavy];
            while(sz[u] - sz[ans[u]] * 2 > sz[u]) ans[u] = fa[ans[u]];
        }
    };

    dfs(dfs, 1);
    for(int i = 1; i <= n; i++){
        cout << ans[i] << '\n';
    }

}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 0
Wrong Answer
time: 67ms
memory: 31252kb

input:

200000
42924 18271
60536 154257
107175 95680
196335 71607
158051 155259
110869 30974
143595 43516
4228 138046
26249 183847
123888 199873
15009 25362
166527 175160
15257 67159
124779 199363
148904 54047
5988 18123
58281 40739
44562 143880
72819 132492
137782 29662
130741 78276
55073 93292
82700 18328...

output:

1
46408
46408
46408
46408
167799
167799
167799
167799
167799
167799
46408
46408
46408
167799
167799
46408
46408
167799
46408
167799
46408
46408
167799
46408
167799
167799
46408
167799
167799
167799
167799
46408
46408
46408
46408
46408
167799
46408
46408
167799
46408
167799
167799
167799
46408
46408
...

result:

wrong answer 2nd numbers differ - expected: '134385', found: '46408'