This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
//Written by: Jethro_
//----------------------
#include <bits/stdc++.h>
using namespace std;
int n, l, r, k;
void solve() {
    cin >> n >> l >> r >> k;
    vector<int> a(n + 1);
    for (int i = 1; i <= n; ++i) {
        cin >> a[i];
    }
    int m = (r - l + 1);
	vector<vector<vector<int>>> dp(n + 1, vector<vector<int>>(m + 1, vector<int>(k + 1, 1e9)));
    int res = 1e9;
    for (int i = 0; i <= n; ++i) {
        for (int j = 0; j <= k; ++j) {
            dp[i][0][j] = 0;
        }
    }
    for (int i = 1; i <= n; ++i) {  
        for (int j = 1; j <= m; ++j) {
            for (int p = 0; p <= k; ++p) {
                dp[i][j][p] = dp[i - 1][j][p];
                if (p - abs(i - (l + j - 1)) >= 0) {
                    dp[i][j][p] = min({dp[i][j][p], dp[i - 1][j - 1][p - abs(i - (l + j - 1))] + a[i]});
                }
                
                if (j == m) res = min(res, dp[i][m][p]);
            }
            
        }
    }
    cout << res;
}
int main() {
    cin.tie(NULL);
    ios_base::sync_with_stdio(false);
    solve();
}
//dp[i][j][k] = max(dp[i - 1][j][k], dp[i][j - 1][k], dp[i - 1][j - 1][k + abs(j - i)] - a[i] + a[j]);
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