Submission #500006

#	Time	Username	Problem	Language	Result	Execution time	Memory
500006		inksamurai	Holding (COCI20_holding)	C++17	55 / 110	52 ms	4492 KiB

holding

#include <bits/stdc++.h>
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) a.begin(),a.end()
#define rep(i,n) for(int i=0;i<n;i++)
#define crep(i,x,n) for(int i=x;i<n;i++)
#define drep(i,n) for(int i=n-1;i>=0;i--)
#define vec(...) vector<__VA_ARGS__>
#define _3qplfh5 ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0)
using namespace std;
typedef long long ll;
typedef long double ld;
using pii=pair<int,int>;
using vi=vector<int>;
using vll=vector<long long>;

const int inf=1e9;

int main(){
_3qplfh5;
	int n,l,r,k;
	cin>>n>>l>>r>>k;
	vi a(n);
	rep(i,n){
		cin>>a[i];
	}
	l--,r--;
	int m=r-l+1;
	vec(vi) dp(m+1,vi(k+1)),nedp;
	// m is wall
	rep(j,m+1){
		dp[j][0]=0;
	}
	drep(i,l){
		nedp=dp;
		rep(cost,k+1){
			vi pdp(m+1,inf);
			pdp[m]=dp[m][cost];
			drep(j,m){
				pdp[j]=dp[j][cost];
				pdp[j]=min(pdp[j],pdp[j+1]);
			}
			drep(j,m){
				int necost=cost+j+l-i;
				if(necost>k) continue;
				nedp[j][necost]=min(nedp[j][necost],pdp[j+1]+a[i]-a[j+l]);
			}
		}
		swap(dp,nedp);
	}
	vec(vi) fdp=dp;
	{
		rep(j,k+1){
			rep(i,m+1){
				if(i) fdp[i][j]=min(fdp[i][j],fdp[i-1][j]);
				if(j) fdp[i][j]=min(fdp[i][j],fdp[i][j-1]);
			}
		}
	}
	dp=vec(vi)(m+1,vi(k+1));
	rep(j,m+1){
		dp[j][0]=0;
	}
	crep(i,r+1,n){
		nedp=dp;
		rep(cost,k+1){
			vi pdp(m+1);
			pdp[0]=dp[0][cost];
			crep(j,1,m){
				pdp[j]=dp[j][cost];
				pdp[j]=min(pdp[j],pdp[j-1]);
			}
			rep(j,m){
				int necost=cost+i-(j+l);
				if(necost>k) continue;
				nedp[j][necost]=min(nedp[j][necost],(j==0?0:pdp[j-1])+a[i]-a[j+l]);
			}
		}
		swap(dp,nedp);
	}
	int ans=inf;
	rep(j,m){
		rep(cost,k+1){
			ans=min(ans,dp[j][cost]+(j>0?fdp[j-1][k-cost]:0));
		}
	}
	ans=min(ans,fdp[m-1][k]);
	int _sum=0;
	crep(i,l,r+1) _sum+=a[i];
	cout<<ans+_sum<<"\n";
//
	return 0;
}

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