Submission #724603

#	Time	Username	Problem	Language	Result	Execution time	Memory
724603		vjudge1	Collecting Stamps 3 (JOI20_ho_t3)	C++17	5 / 100	1 ms	596 KiB

ho_t3

#include <bits/stdc++.h>
using namespace std;
 
#define fi first
#define se second
#define pb push_back
 
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 1e5+10;
const ll INF = 0x3f3f3f3f3f3f3f3f;

int n;
vector<ll> arr, tempo;
int dp[205][405];

int calc(int i, int at, ll curr, int nxd, int nxu){
	if(i==n) return 0;
	if(dp[i][at]!=-1) return dp[i][at];

	int ret=0;
	if(tempo[nxd]>=curr+abs(arr[at]-arr[nxd])) ret=1+calc(i+1, nxd, curr+abs(arr[at]-arr[nxd]), nxd-1, nxu);
	else ret=calc(i+1, nxd, curr+abs(arr[at]-arr[nxd]), nxd-1, nxu);

	if(tempo[nxu]>=curr+abs(arr[nxu]-arr[at])) ret=max(ret, 1+calc(i+1, nxu, curr+abs(arr[nxu]-arr[at]), nxd, nxu+1));
	else ret=max(ret, calc(i+1, nxu, curr+abs(arr[nxu]-arr[at]), nxd, nxu+1));

	return dp[i][at]=ret;
}

int main(){
  	ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);

    // freopen("shuffle.in","r",stdin);
    // freopen("shuffle.out","w",stdout);

	ll l; cin >> n >> l;

	for(int i=0;i<n;i++){
		ll x; cin >> x;
		arr.pb(x);
	}
	arr.pb(l);
	for(int i=0;i<n;i++) arr.pb(arr[i]+l);

	tempo.resize(2*n+1);
	for(int i=0;i<n;i++) cin >> tempo[i];
	for(int i=0;i<n;i++) tempo[i+n+1]=tempo[i];
	tempo[n]=-1;

	memset(dp, -1, sizeof dp);

	cout << calc(0, n, 0ll, n-1, n+1) << "\n";
	return 0;
}

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