Submission #313371

#	Time	Username	Problem	Language	Result	Execution time	Memory
313371		sofapuden	Collecting Stamps 3 (JOI20_ho_t3)	C++14	0 / 100	37 ms	66816 KiB

ho_t3

#include <bits/stdc++.h>

using namespace std;

const int maxn = 204;

int n, l, dp[maxn][maxn][maxn][2], X[maxn], T[maxn]; 

int main(){
	memset(dp, INT_MAX, sizeof dp);
	ios::sync_with_stdio(0), cin.tie(0);
	cin >> n >> l;
	for(int i = 1; i <= n; ++i)cin >> X[i];
	X[n+1] = l;
	for(int i = 1; i <= n; ++i)cin >> T[i];
	++n;
	T[0] = -1;
	dp[0][n][0][0] = 0;
	dp[0][n][0][1] = 0;
	
	int ans = 0;
	
	for(int x = n-1; x >= 1; --x){
		for(int i = 0; i+x <= n; ++i){
			int j = i+x;
			for(int k = 0; k <= n; ++k){
				if(i){
					dp[i][j][k][0] = min(dp[i][j][k][0], dp[i-1][j][k][0] + X[i] - X[i-1]);
				}
				if(j != n){
					dp[i][j][k][1] = min(dp[i][j][k][1], dp[i][j+1][k][1] + X[j+1] - X[j]);
				}
				if(k){
					if(i && dp[i-1][j][k-1][0] + X[i] - X[i-1] <= T[i]){
						dp[i][j][k][0] = min(dp[i][j][k][0], dp[i-1][j][k-1][0] + X[i] - X[i-1]);
					}
					if(j != n && dp[i][j+1][k-1][1] + X[j+1] - X[j] <= T[j]){
						dp[i][j][k][1] = min(dp[i][j][k][1], dp[i][j+1][k-1][1] + X[j+1] - X[j]);
					}
				}
				dp[i][j][k][0] = min(dp[i][j][k][0], dp[i][j][k][1] + l - X[j] + X[i]);
				dp[i][j][k][1] = min(dp[i][j][k][1], dp[i][j][k][0] + l - X[j] + X[i]);
				if(min(dp[i][j][k][0],dp[i][j][k][1]) < 10000000000)ans = max(ans,k);
			}
		}
	}
					
	
	cout << ans << "\n";
			
			
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 75