Submission #201344

#	Time	Username	Problem	Language	Result	Execution time	Memory
201344		Atalasion	Collecting Stamps 3 (JOI20_ho_t3)	C++14	100 / 100	117 ms	145528 KiB

ho_t3

//khodaya khodet komak kon
#include <bits/stdc++.h>

#define F first
#define S second
#define pb push_back
#define all(x) x.begin(), x.end()
#pragma GCC optimise ("ofast")
#pragma GCC optimise("unroll-loops")
#define int long long

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;

const int N = 200 + 10;
const ll MOD = 1000000000 + 7;
const ll INF = 1000000000000000000;
const ll LOG = 25;

int dp[N][N][N][2];
int n, x[N], L, T[N];

int32_t main(){
	ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	cin >> n >> L;
	for (int i = 1; i <= n; i++) cin >> x[i];
	for (int i = 1; i <= n; i++) cin >> T[i];
	x[n + 1] = L;
	memset(dp, 63, sizeof dp);
	dp[0][0][0][0] = dp[0][0][0][1] = 0;
	for (int i = 0; i <= n; i++){
		for (int j = 0; j <= n - i - 1; j++){
			for (int k = 0; k <= (i + j); k++){
				//cout << i << ' ' << j << ' ' << k << ' ' << dp[i][j][k][0] << ' ' << dp[i][j][k][1] << '\n';
				int ti = dp[i][j][k][0];
				if (ti + x[i + 1] - x[i] <= T[i + 1]) dp[i + 1][j][k + 1][0] = min(dp[i + 1][j][k + 1][0], ti + x[i + 1] - x[i]);
				else dp[i + 1][j][k][0] = min(dp[i + 1][j][k][0], ti + x[i + 1] - x[i]);
				//cout << ti + x[i] + L - x[n - j] << '\n';
				if (ti + x[i] + L - x[n - j] <= T[n - j]) dp[i][j + 1][k + 1][1] = min(dp[i][j + 1][k + 1][1], ti + x[i] + L - x[n - j]);
				else dp[i][j + 1][k][1] = min(dp[i][j + 1][k][1], ti + x[i] + L - x[n - j]); 
				ti = dp[i][j][k][1];
				if (ti + x[n - j + 1] - x[n - j] <= T[n - j]) dp[i][j + 1][k + 1][1] = min(dp[i][j + 1][k + 1][1], ti + x[n - j + 1] - x[n - j]);
				else dp[i][j + 1][k][1] = min(dp[i][j + 1][k][1], ti + x[n - j + 1] - x[n - j]);
				if (L - x[n - j + 1] + ti + x[i + 1] <= T[i + 1]) dp[i + 1][j][k + 1][0] = min(dp[i + 1][j][k + 1][0], L - x[n - j + 1] + ti + x[i + 1]);
				else dp[i + 1][j][k][0] = min(dp[i + 1][j][k][0], L - x[n - j + 1] + ti + x[i + 1]);
			}
		}
	}
	int ans = 0;
	for (int i = 1; i <= n; i++){
		for (int j = 0; j <= n; j++){
			if (min(dp[j][n - j][i][0], dp[j][n - j][i][1]) <= (1000000000000ll)) ans = i;
		}
	}
	cout << ans;











	return 0;
}

Compilation message (stderr)

ho_t3.cpp:8:0: warning: ignoring #pragma GCC optimise [-Wunknown-pragmas]
 #pragma GCC optimise ("ofast")
 
ho_t3.cpp:9:0: warning: ignoring #pragma GCC optimise [-Wunknown-pragmas]
 #pragma GCC optimise("unroll-loops")

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