Submission #910080

#	Time	Username	Problem	Language	Result	Execution time	Memory
910080		OAleksa	Collecting Stamps 3 (JOI20_ho_t3)	C++14	15 / 100	4 ms	1628 KiB

ho_t3

#include <bits/stdc++.h>
//ako ovaj vaso daso misli da me pobedjuje.....
using namespace std;
#define int long long
#define f first
#define s second
const int N = 210;
const int inf = 1e18;
int n, l, x[N], t[N], dp[N][N][2][2];
signed main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int tt = 1;
  //cin >> tt;
  while (tt--) {
  	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++)
  			dp[i][j][0][0] = dp[i][j][1][0] = inf;
  	}
  	//3-i/j
  	//4-time/skor
  	dp[0][0][0][0] = dp[0][0][1][0] = 0;
  	int ans = 0;
  	for (int i = 0;i <= n;i++) {
  		for (int j = 0;j <= n;j++) {
  			if (i + j > n)
  				break;
  			for (int k = i - 1;k >= 0;k--) {
  				int time = dp[k][j][0][0] + abs(x[i] - x[k]);
  				if (time <= t[i]) {
  					if (dp[i][j][0][1] < dp[k][j][0][1] + 1) {
  						dp[i][j][0][1] = dp[k][j][0][1] + 1;
  						dp[i][j][0][0] = time;
  					}
  					else if (dp[i][j][0][1] == dp[k][j][0][1] + 1)
  						dp[i][j][0][0] = min(dp[i][j][0][0], time);
  				}
  				time = dp[k][j][1][0] + x[i] + (l - x[n - j + 1]);
  				if (time <= t[i]) {
  					if (dp[i][j][0][1] < dp[k][j][1][1] + 1) {
  						dp[i][j][0][1] = dp[k][j][1][1] + 1;
  						dp[i][j][0][0] = time;
  					}
  					else if (dp[i][j][0][1] == dp[k][j][1][1] + 1)
  						dp[i][j][0][0] = min(dp[i][j][0][0], time);
  				}
  			}
  			for (int k = j - 1;k >= 0;k--) {
  				int time = dp[i][k][1][0] + abs(x[n - j + 1] - (k == 0 ? l - x[n - k + 1] : x[n - k + 1]));
  				if (time <= t[n - j + 1]) {
  					if (dp[i][j][1][1] < dp[i][k][1][1] + 1) {
  						dp[i][j][1][1] = dp[i][k][1][1] + 1;
  						dp[i][j][1][0] = time;
  					}
  					else if (dp[i][j][1][1] == dp[i][k][1][1] + 1)
  						dp[i][j][1][0] = min(dp[i][j][1][0], time);
  				}
  				time = dp[i][k][0][0] + x[i] + (l - x[n - j + 1]);
  				if (time <= t[n - j + 1]) {
  					if (dp[i][j][1][1] < dp[i][k][0][1] + 1) {
  						dp[i][j][1][1] = dp[i][k][0][1] + 1;
  						dp[i][j][1][0] = time;
  					}
  					else if (dp[i][j][1][1] == dp[i][k][0][1] + 1)
  						dp[i][j][1][0] = min(dp[i][j][1][0], time);
  				}
  			}
  			if (i == 0 && j > 0)
  				dp[i][j][0][0] = 2 * (l - x[n - j + 1]);
  			if (j == 0 && i > 0)
  				dp[i][j][1][0] = 2 * x[i];
  			ans = max(ans, max(dp[i][j][0][1], dp[i][j][1][1]));
  		}
  	}
  	cout << ans;
	}
  return 0;
}

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