Submission #840041

#	Time	Username	Problem	Language	Result	Execution time	Memory
840041		cjoa	Closing Time (IOI23_closing)	C++17	0 / 100	1067 ms	6492 KiB

closing

#include "closing.h"

#include <vector>
#include <algorithm>

#include <iostream>

using namespace std;

using llong = long long;

const llong INF = 4e18;

vector<llong> F(int N, const vector<int>& W, int src) {
    vector<llong> V(N + 1, INF);
    V[0] = V[1] = 0;
    llong sum_left = 0, sum_left2 = 0;
    for (int l = src; l >= 0; --l) {
        llong sum_right = 0, sum_right2 = 0;
        for (int r = src; r < N; ++r) {
            int len = r - l + 1;
            V[len] = min(V[len], sum_left2 + sum_right2);
            if (r+1 < N) {
                sum_right += W[r];
                sum_right2 += sum_right;
            }
        }
        if (l > 0) {
            sum_left += W[l-1];
            sum_left2 += sum_left;
        }
    }

    for (int len = N-1; len >= 1; len--) {
        if (V[len] > V[len+1])
            V[len] = V[len+1];
    }

/*
    cerr << "src: " << src << endl;
    for (int len = 1; len <= N; len++)
        cerr << V[len] << ' ';
    cerr << endl;
*/

    return V;
}

int max_score(int N, int X, int Y, long long K,
              std::vector<int> U, std::vector<int> V, std::vector<int> W)
{
    // subtasks 2, 3, and 4
//  cerr << "K: " << K << endl;

    vector<llong> VX = F(N, W, X);
    vector<llong> VY = F(N, W, Y);

    int res = 0;
    for (int lenX = 1; lenX <= N and VX[lenX] <= K; lenX++) {
        auto it = upper_bound(VY.begin(), VY.end(), K - VX[lenX]);
        int lenY = it - VY.begin() - 1;
    //  cerr << "lenX: " << lenX << "  lenY: " << lenY << endl;
        res = max(res, lenX + lenY);
    }

    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