Submission #1070823

#	Time	Username	Problem	Language	Result	Execution time	Memory
1070823		MohamedFaresNebili	Closing Time (IOI23_closing)	C++17	0 / 100	1065 ms	38352 KiB

closing

#include <bits/stdc++.h>
#include "closing.h"

        using namespace std;

        vector<pair<int, long long>> adj[200005];
        long long D[200005][2];
        vector<long long> pL, pR, pM;
        void dfs(int X, int p, int st) {
            for(auto u : adj[X]) {
                if(u.first == p) continue;
                D[u.first][st] = D[X][st] + u.second;
                dfs(u.first, X, st);
            }
        }
        long long sum(int l, int r, vector<long long> arr) {
            return arr[r] - (l > 0 ? arr[l - 1] : 0);
        }

        int max_score(int N, int X, int Y, long long K,
            vector<int> U, vector<int> V, vector<int> W) {
            pL.resize(N); pR.resize(N); pM.resize(N);
            for(int l = 0; l < N; l++) D[l][0] = D[l][1] = 2e18 + 7, adj[l].clear();
            for(int l = 0; l < N - 1; l++) {
                adj[U[l]].push_back({V[l], W[l]});
                adj[V[l]].push_back({U[l], W[l]});
            }
            if(X > Y) swap(X, Y);
            D[X][0] = 0, D[Y][1] = 0;
            dfs(X, X, 0); dfs(Y, Y, 1);
            for(int l = 0; l < N; l++) {
                pL[l] = D[l][0];
                pR[l] = D[l][1];
                pM[l] = min(D[l][0], D[l][1]);
                if(l > 0) {
                    pL[l] += pL[l - 1];
                    pR[l] += pR[l - 1];
                    pM[l] += pM[l - 1];
                }
            }
            int res = 0;
            for(int l = 0; l < N; l++) {
                for(int i = l; i < N; i++) {
                    int lo = l, hi = i;
                    long long calc = sum(l, i, pL) + sum(l, i, pR) - sum(l, i, pM);
                    if(calc > K) continue;
                    int cur = i - l + 1;
                    priority_queue<pair<int, long long>, vector<pair<int, long long>>, greater<pair<int, long long>>> pq;
                    if(i < N - 1) pq.push({D[i + 1][1], i + 1});
                    if(l > 0) pq.push({D[l - 1][0], l - 1});
                    while(!pq.empty()) {
                        int x = pq.top().second; long long w = pq.top().first;
                        pq.pop(); calc += w;
                        if(calc > K) break;
                        ++cur; lo = min(lo, x), hi = max(hi, x);
                        if(x > i && x < N - 1) pq.push({D[x + 1][1], x + 1});
                        if(x < l && x > 0) pq.push({D[x - 1][0], x - 1});
                    }
                    if(X >= lo && Y <= hi) res = max(res, cur);
                }
            }

            vector<int> belong(N, -1);
            belong[X] = 0, belong[Y] = 1;
            priority_queue<array<long long, 3>, vector<array<long long, 3>>, greater<array<long long, 3>>> pq;
            pq.push({0, X, 0}); pq.push({0, Y, 1});
            int cur = 0; long long calc = 0;
            while(!pq.empty()) {
                int a = pq.top()[1], st = pq.top()[2];
                long long w = pq.top()[0]; pq.pop();
                if(calc + w > K) break;
                if(belong[a] != -1) continue;
                belong[a] = st; calc += w; cur++;
                if(a > 0) {
                    int b = a - 1;
                    if(belong[b] == -1) {
                        array<long long, 3> arr = {D[b][st], b, st};
                        pq.push(arr);
                    }
                }
                if(a < N - 1) {
                    int b = a + 1;
                    if(belong[b] == -1) {
                        array<long long, 3> arr = {D[b][st], b, st};
                        pq.push(arr);
                    }
                }
            }
            res = max(res, cur);
            return res;
        }

• 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