Submission #1008719

#	Time	Username	Problem	Language	Result	Execution time	Memory
1008719		giorgi_pkhaladze	Collecting Stamps 3 (JOI20_ho_t3)	C++14	15 / 100	5 ms	6748 KiB

ho_t3

#include <bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pb push_back
using namespace std;
ll n,m,k,i,j,ans,a[25],t[25],d[25][25][25][25];
ll check(int l, int r, int pos, int cnt){
	if(cnt==0)return 1e14;
	if(l>r)return -1e14;
	if(d[l][r][pos][cnt]!=-1)return d[l][r][pos][cnt];
	ll ans=-1e14;
	int lc;
	if(pos==0) lc=l-1;
	else lc=r+1;
	ans=max(ans,check(l+1,r,0,cnt)-(min(abs(a[l]-a[lc]),m-abs(a[l]-a[lc]))));
	ans=max(ans,check(l,r-1,1,cnt)-(min(abs(a[r]-a[lc]),m-abs(a[r]-a[lc]))));
	ans=max(ans,min(t[l],check(l+1,r,0,cnt-1))-(min(abs(a[l]-a[lc]),m-abs(a[l]-a[lc]))));
	ans=max(ans,min(t[r],check(l,r-1,1,cnt-1))-(min(abs(a[r]-a[lc]),m-abs(a[r]-a[lc]))));
	d[l][r][pos][cnt]=ans;
	return ans;
}
int main() {
	cin>>n>>m;
	for(k=0; k<n; k++)cin>>a[k];
	for(k=0; k<n; k++)cin>>t[k];
	memset(d,-1,sizeof d);
	ll fans=0;
	for(k=0; k<=n; k++) {
	if(check(0,n-1,1,k)>=0)fans=k;}
	cout<<fans;
}

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