Submission #235491

#TimeUsernameProblemLanguageResultExecution timeMemory
235491dooweyHolding (COCI20_holding)C++14
55 / 110
158 ms64768 KiB
#include <bits/stdc++.h> using namespace std; typedef long long ll; typedef long double ld; typedef pair<int, int> pii; #define fi first #define se second #define mp make_pair #define fastIO ios::sync_with_stdio(false);cin.tie(0);cout.tie(0); const int N = 55; const int S = N * (N + 1); const int M = S/2; const int inf = (int)1e9; int dpL[N][N][S]; // pick i items, indice sum j int dpR[N][N][S]; int a[N]; void upd(int &a, int b){ a = min(a, b); } int main(){ fastIO; int n, l, r, k; cin >> n >> l >> r >> k; for(int q = 0; q <= n + 1; q ++ ){ for(int d = 0; d <= n; d ++ ){ for(int s = 0; s < S; s ++ ){ dpL[q][d][s] = inf; dpR[q][d][s] = inf; } } } dpL[0][0][M]=0; int ans = 0; for(int i = 1; i <= n; i ++ ){ cin >> a[i]; if(i >= l && i <= r) ans += a[i]; } for(int i = 1; i <= r; i ++ ){ for(int j = 0 ; j <= n ; j ++ ){ for(int x = 0; x < S ; x ++ ){ if(i < l){ if(dpL[i-1][j][x] == inf) continue; upd(dpL[i][j + 1][x - i], dpL[i-1][j][x] + a[i]); upd(dpL[i][j][x], dpL[i-1][j][x]); } else{ if(dpL[i-1][j][x] == inf) continue; if(j) upd(dpL[i][j - 1][x + i], dpL[i-1][j][x]); upd(dpL[i][j][x], dpL[i-1][j][x] + a[i]); } } } } for(int x = 0; x <= k ; x ++ ){ upd(ans, dpL[r][0][x + M]); } dpR[n + 1][0][M]=0; for(int i = n; i >= l ; i -- ){ for(int j = 0 ; j <= n; j ++ ){ for(int x = 0; x < S; x ++ ){ if(dpR[i + 1][j][x] == inf) continue; if(i > r){ upd(dpR[i][j + 1][x + i], dpR[i + 1][j][x] + a[i]); upd(dpR[i][j][x], dpR[i + 1][j][x]); } else{ if(j) upd(dpR[i][j - 1][x - i], dpR[i + 1][j][x]); upd(dpR[i][j][x], dpR[i + 1][j][x] + a[i]); } } } } for(int x = 0; x <= k ; x ++ ){ upd(ans, dpR[l][0][x + M]); } for(int i = l ; i + 1 <= r; i ++ ){ for(int x = 0; x <= k; x ++ ){ if(dpL[i][0][x] == inf) continue; for(int y = 0; x + y <= k; y ++ ){ if(dpR[i + 1][0][y] == inf) continue; upd(ans, dpL[i][0][x] + dpR[i + 1][0][y]); } } } cout << ans << "\n"; return 0; }
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