Submission #333894

#	Time	Username	Problem	Language	Result	Execution time	Memory
333894		wiwiho	Papričice (COCI20_papricice)	C++14	50 / 110	1098 ms	16236 KiB

papricice

#include <bits/stdc++.h>

#define pii pair<int, int>
#define mp make_pair
#define F first
#define S second
#define iter(a) a.begin(), a.end()
#define eb emplace_back

using namespace std;

typedef long long ll;

const ll MAX = 2147483647;

vector<vector<int>> g;
vector<int> sz, in, out;
int ts = 0;

void dfs(int now, int p){
    in[now] = ts++;
    for(int i : g[now]){
        if(i == p) continue;
        dfs(i, now);
        sz[now] += sz[i];
    }
    out[now] = ts++;
}

bool isAnc(int a, int b){
    return in[a] <= in[b] && out[a] >= out[b];
}

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    int n;
    cin >> n;

    g.resize(n + 1);
    in.resize(n + 1);
    out.resize(n + 1);
    sz.resize(n + 1, 1);
    for(int i = 0; i < n - 1; i ++){
        int u, v;
        cin >> u >> v;
        g[u].eb(v);
        g[v].eb(u);
    }

    dfs(1, 1);

    int ans = n;
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= n; j++){
            if(isAnc(i, j) || isAnc(j, i)) continue;
            int all = n - sz[i] - sz[j];
            ans = min(ans, max({abs(sz[i] - sz[j]), abs(all - sz[j]), abs(all - sz[i])}));
        }
    }

    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= n; j++){
            if(!isAnc(i, j)) continue;
            int t0 = n - sz[i];
            int t1 = sz[i] - sz[j];
            int t2 = sz[j];
            ans = min(ans, max({abs(t0 - t1), abs(t1 - t2), abs(t2 - t0)}));
        }
    }

    cout << ans << "\n";
    
    return 0;
}

• Subtask 1: 15 / 15
• Subtask 2: 35 / 35
• Subtask 3: 0 / 60