Submission #854914

#	Time	Username	Problem	Language	Result	Execution time	Memory
854914		vjudge1	Triple Jump (JOI19_jumps)	C++17	5 / 100	198 ms	524292 KiB

jumps

#include<bits/stdc++.h>
using namespace std;
#define int long long 
#define ll long long
#define pii pair<int,int>
#define F first
#define S second
#define endl '\n'
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) a.begin(),a.end()
const int mod = 1e9 + 7;
const int N = 5003;
const ll inf = 1e18;
int mx[N][N];
int suf[N];
int a[N];
int ans[N][N];
int dp[N][N];
int32_t main(){
	ios_base::sync_with_stdio(0);cin.tie(0);
	int n;
	cin >> n;
	for (int i=1;i<=n;i++){
		cin >> a[i];
		mx[i][i] = a[i];
	}
	for (int i=1;i<=n;i++){
		for (int j=i+1;j<=n;j++){
			mx[i][j] = max(mx[i][j-1], mx[i][j]);
		}
	}
	for (int i=1;i<=n;i++){
		dp[i][i+1] = a[i]+a[i+1];
	}
	for (int i=1;i<=n;i++){
		for (int j=i+2;j<=n;j++){
			dp[i][j] = max(dp[i][j-1], a[j]+mx[i][j-1]);
		}
	}
	for (int l=1;l<=n-1;l++){
		for (int r=l+1;r<=n;r++){
			int c = r + (r-l);
			suf[c] = max(dp[l][r], suf[c]);
		}
		for (int i=1;i<=n;i++){
			suf[i] = max(suf[i], suf[i-1]);
		}
		for (int r=l+2;r<=n;r++){
			ans[l][r] = max(ans[l][r-1], suf[r]+a[r]);
		}
		memset(suf, 0, sizeof(suf));
	}
	for (int i=1;i<=n;i++){
		for (int j=i;j>=1;j--){
			ans[j][i] = max(ans[j+1][i], ans[j][i]);
			//cout << i << ' ' << j << ' ' << ans[i][j] << endl;
		}
	}
	int q;
	cin >> q;
	while (q--){
		int l, r;
		cin >> l >> r;
		cout << ans[l][r] << endl;
	}
}

• Subtask 1: 5 / 5
• Subtask 2: 0 / 14
• Subtask 3: 0 / 27
• Subtask 4: 0 / 54