Submission #879637

#	Time	Username	Problem	Language	Result	Execution time	Memory
879637		serifefedartar	Collecting Stamps 3 (JOI20_ho_t3)	C++17	100 / 100	113 ms	135512 KiB

ho_t3

#include <bits/stdc++.h>
using namespace std;

#define fast ios::sync_with_stdio(0);cin.tie(0);
#define s second
#define f first
typedef long long ll;
const ll MOD = 1e9 + 9;
const ll LOGN = 21;
const ll MAXN = 1e6 + 100;
#define int long long

vector<int> X, T;
int dp[205][205][205][2], N, L;
int find_dist(int i, int j) {
	if (i != N + 1 && j != 0)
		return min(abs(X[j] - X[i]), L - abs(X[j] - X[i]));
	if (i == N + 1)
		return min(X[j], L - X[j]);
	if (j == 0)
		return min(X[i], L - X[i]);
}

signed main() {
	fast
	cin >> N >> L;

	X = vector<int>(N+1);
	T = vector<int>(N+1);
	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 < 205; i++) {
		for (int j = 0; j < 205; j++) {
			for (int k = 0; k < 205; k++)
				dp[i][j][k][0] = dp[i][j][k][1] = 1e15;
		}
	}
	
	dp[0][0][0][0] = dp[0][0][0][1] = 0;

	int ans = 0;
	for (int l = 0; l <= N; l++) {
		for (int r = 0; r <= N; r++) {
			if (l + r >= N)
				continue;
			for (int cnt = 0; cnt <= N; cnt++) {
				// solda bulunuyor
				int x = dp[cnt][l][r][0] + find_dist(N - l + 1, N - l);
				if (x < dp[cnt + (x <= T[N-l])][l+1][r][0]) {
					dp[cnt + (x <= T[N-l])][l+1][r][0] = x;
					ans = max(ans, cnt + (x <= T[N-l]));
				}

				x = dp[cnt][l][r][0] + find_dist(N - l + 1, r + 1);
				if (x < dp[cnt + (x <= T[r+1])][l][r+1][1]) {
					dp[cnt + (x <= T[r+1])][l][r+1][1] = x;
					ans = max(ans, cnt + (x <= T[r+1]));
				}

				// sağda bulunuyor
				x = dp[cnt][l][r][1] + find_dist(N - l, r);
				if (x < dp[cnt + (x <= T[N-l])][l+1][r][0]) {
					dp[cnt + (x <= T[N-l])][l+1][r][0] = x;
					ans = max(ans, cnt + (x <= T[N-l]));
				}

				x = dp[cnt][l][r][1] + find_dist(r, r + 1);
				if (x < dp[cnt + (x <= T[r+1])][l][r+1][1]) {
					dp[cnt + (x <= T[r+1])][l][r+1][1] = x;
					ans = max(ans, cnt + (x <= T[r+1]));
				}
			}
		}
	}

	cout << ans << "\n";
}

Compilation message (stderr)

ho_t3.cpp: In function 'long long int find_dist(long long int, long long int)':
ho_t3.cpp:22:1: warning: control reaches end of non-void function [-Wreturn-type]
   22 | }
      | ^

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