This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define int long long int
const int MAX = 115;
const int INF = 1e18 + 10;
int n, l, r, k, a[MAX];
int32_t main(void)
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cin >> n >> l >> r >> k;
for(int i = 1; i <= n; i++)
cin >> a[i];
vector<vector<vector<int>>> dpL(l + 1, vector<vector<int>>(n + 1, vector<int>(k + 1, INF)));
dpL[0][0][0] = 0;
for(int i = 1; i <= l; i++)
for(int j = 0; j <= l; j++)
for(int t = 0; t <= k; t++)
dpL[i][j][t] = min(dpL[i - 1][j][t], (t >= i && j >= 1 ? dpL[i - 1][j - 1][t - i] + a[i] : INF));
vector<vector<vector<int>>> dpR(n + 10, vector<vector<int>>(n + 1, vector<int>(k + 1, -INF)));
dpR[n + 1][0][0] = 0;
for(int i = n; i >= l; i--)
for(int j = 0; j <= n; j++)
for(int t = 0; t <= k; t++)
dpR[i][j][t] = max(dpR[i + 1][j][t], (t >= i && j >= 1 ? dpR[i + 1][j - 1][t - i] + a[i] : -INF));
int ans = INF;
int sum = 0;
for(int i = l; i <= r; i++) sum += a[i];
for(int q = 0; q <= l; q++)
for(int c = 0; c <= k; c++)
for(int j = 0; j <= c; j++)
ans = min(ans, sum + dpL[l - 1][q][c] - dpR[l][q][c - j]);
cout << ans << '\n';
}
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