Submission #870818

#	Time	Username	Problem	Language	Result	Execution time	Memory
870818		hungnt	Holding (COCI20_holding)	C++14	88 / 110	34 ms	110832 KiB

holding

#include <bits/stdc++.h>

using namespace std;

const int N = 105;

int n, L, R, k, s;
int a[102];
int dp[N][2505][N], Left[N][2505], Right[N][2505];

void MAX(int &A, int B)
{
    if(A < B) A = B;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
    cin >> n >> L >> R >> k;
    for(int i = 1; i <= n; i++) cin >> a[i];
    for(int i = L; i <= R; i++) s += a[i];
    k = min(k, n * n / 4);
    int ans = 0;
    for(int i = L; i <= R; i++)
        for(int j = L - 1; j > 0; j--)
            for(int c = 1; c <= k; c++)
            {
                MAX(dp[i][c][j], dp[i - 1][c][j]);
                MAX(dp[i][c][j], dp[i][c][j + 1]);
                if(c - i + j >= 0)
                    MAX(dp[i][c][j], dp[i - 1][c - i + j][j + 1] + a[i] - a[j]);
            }
    for(int i = L; i <= R; i++)
        for(int j = 1; j <= k; j++)
        {
            Left[i][j] = dp[i][j][1];
//            MAX(Left[i][j], Left[i][j - 1]);
        }
    memset(dp, 0, sizeof dp);
    for(int i = R; i >= L; i--)
        for(int j = R + 1; j <= n; j++)
        {
            for(int c = 1; c <= k; c++)
            {
                MAX(dp[i][c][j], dp[i + 1][c][j]);
                MAX(dp[i][c][j], dp[i][c][j - 1]);
                if(c + i - j >= 0)
                    MAX(dp[i][c][j], dp[i + 1][c - i + j][j - 1] + a[i] - a[j]);
            }
        }
    for(int i = R; i >= L; i--)
        for(int j = 1; j <= k; j++)
        {
            Right[i][j] = dp[i][j][n];
//            MAX(Right[i][j], Right[i][j - 1]);
        }
    for(int i = L - 1; i <= R; i++)
        for(int j = 0; j <= k; j++)
            MAX(ans, Left[i][j] + Right[i + 1][k - j]);
    cout << s - ans;
}

• Subtask 1: 22 / 22
• Subtask 2: 33 / 33
• Subtask 3: 33 / 33
• Subtask 4: 0 / 22