Submission #1233277

#	Time	Username	Problem	Language	Result	Execution time	Memory
1233277		Ghulam_Junaid	Closing Time (IOI23_closing)	C++20	0 / 100	228 ms	44292 KiB

closing

#include <bits/stdc++.h>
#include "closing.h"
using namespace std;

typedef long long ll;

const int N = 2e5 + 10;
int n, x[2];
ll k, dist[N][2];
vector<pair<int, int>> g[N];

void dfs(int v, int id, int p = -1){
    for (auto [w, u] : g[v]){
        if (u == p) continue;
        dist[u][id] = dist[v][id] + w;
        dfs(u, id, v);
    }
}

int max_score(int nn, int xx, int yy, ll kk, vector<int> uu, vector<int> vv, vector<int> ww){
    n = nn, x[0] = xx, x[1] = yy, k = kk;
    for (int i = 0; i < n - 1; i ++){
        g[uu[i]].push_back({ww[i], vv[i]});
        g[vv[i]].push_back({ww[i], uu[i]});
    }
    
    multiset<int> st[2];
    for (int id : {0, 1}){
        dist[x[id]][id] = 0;
        dfs(x[id], id);
        for (int i = 0; i < n; i ++)
            st[id].insert(dist[i][id]);
    }

    int ans = 0;
    while (st[0].size() and st[1].size()){
        int a = *st[0].begin(), b = *st[1].begin();
        if (a <= b){
            if (k < a) break;
            k -= a;
            st[0].erase(st[0].begin());
            ans++;
            continue;
        }
        if (k < b) break;
        k -= b;
        st[1].erase(st[1].begin());
        ans++;
        continue;
    }

    for (int i = 0; i < n; i ++) g[i].clear();
    return ans;
}

• Subtask 0: 0 / 0
• Subtask 1: 0 / 8
• Subtask 2: 0 / 9
• Subtask 3: 0 / 12
• Subtask 4: 0 / 14
• Subtask 5: 0 / 9
• Subtask 6: 0 / 11
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 17