Submission #922861

#	Time	Username	Problem	Language	Result	Execution time	Memory
922861		dimashhh	Collecting Stamps 3 (JOI20_ho_t3)	C++17	100 / 100	54 ms	142212 KiB

ho_t3

#include <bits/stdc++.h>

using namespace std;
const int N = 212, MOD = 1e9 + 7;

typedef long long ll;
#define int ll
int n,L,t[N],x[N];
ll dp[N][N][N][2];
void test() {
    cin >> n >> L;
    for(int i = 1;i <= n;i++){
        cin >> x[i];
    }
    for(int i = 1;i <= n;i++){
        cin >> t[i];
    }
    for(int i = 0;i <= n;i++){
        for(int j = 0;j <= n;j++){
            for(int k = 0;k <= n;k++){
                for(int f = 0;f < 2;++f){
                    dp[i][j][k][f] = 1e18;
                }
            }
        }
    }
    x[n + 1] = L;
    dp[0][0][0][0] = dp[0][0][0][1] = 0;
    for(int i = 0;i <= n;i++){
        for(int j = 0;j <= n;j++){
            if(i + j >= n) break;
            for(int k = 0;k <= i + j;k++){
                int t1,t2,t3,t4;
                t1 = min(dp[i][j][k][1] + x[i + 1] + L - x[n - j + 1], dp[i][j][k][0] + x[i + 1] - x[i]);//i + 1,j,0
                t2 = t1 + x[i + 1] + L - x[n - j + 1];//i + 1,j,1
                t3 = min(dp[i][j][k][0] + x[i] + L - x[n - j], dp[i][j][k][1] - x[n - j] + x[n - j + 1]);//i,j + 1,1
                t4 = t3 + x[i] + L - x[n - j];//i,j + 1,0
                {
                    dp[i + 1][j][k][0] = min(dp[i + 1][j][k][0],t1);
                    if(t[i + 1] >= t1){
                        dp[i + 1][j][k + 1][0] = min(dp[i + 1][j][k + 1][0],t1);
                    }
                }
                {
                    dp[i + 1][j][k][1] = min(dp[i + 1][j][k][1],t2);
                }
                {
                    dp[i][j + 1][k][1] = min(dp[i][j + 1][k][1],t3);
                    if(t[n - j] >= t3){
                        dp[i][j + 1][k + 1][1] = min(dp[i][j + 1][k + 1][1],t3);
                    }
                }
                {
                    dp[i][j + 1][k][0] = min(dp[i][j + 1][k][0],t4);
                }
            }
        }
    }
    int res = 0;
    for(int i = 0;i <= n;i++){
        for(int j = 0;j <= n;++j){
            if(i + j > n) break;
            for(int k = 0;k <= i + j;k++){
                if(min(dp[i][j][k][0],dp[i][j][k][1]) != 1e18){
                    res = max(res,k);
                }
            }

        }
    }
    cout << res << '\n';
}
signed main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);
    int T = 1;
//    cin >> T;
    while (T--)
        test();
}

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