Submission #498974

#	Time	Username	Problem	Language	Result	Execution time	Memory
498974		Karabasan	Watching (JOI13_watching)	C++17	0 / 100	176 ms	31780 KiB

watching

#include <bits/stdc++.h>
#define ll long long
#define fast1 ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define int long long
using namespace std;
#pragma GCC optimize("Ofast")
#pragma GCC target("fma,sse,sse2,sse3,ssse3,sse4")
#pragma GCC optimize("unroll-loops")

int n,m,ar[2005],p,q;
int dp[2005][2005];
bool check(int w)
{
	int lp=0,lq=0;
	memset(dp,0,sizeof(dp));
	for(ll i=1;i<=n;i++)
	{
		while(lp<n&&ar[lp+1]<=ar[i]-w)
			lp++;
		while(lq<n&&ar[lq+1]<=ar[i]-2*w)
			lq++;
		for(int j=0;j<=min(i,p);j++)
		{
			if(j==0)
			{
				dp[i][j]=dp[lq][0]+1;
				continue;
			}
			int t1=dp[lp][j-1];
			int t2=dp[lq][j]+1;

			dp[i][j]=min(t1,t2);
		}
	}
	for(int i=0;i<min(n,p);i++)
    {
        if(dp[n][i]<=q)
            return true;
    }
    return false;
}
signed main()
{
	fast1;
	cin>>n>>p>>q;
	for(int i=1;i<=n;i++)
		cin>>ar[i];
	sort(ar+1,ar+n+1);
	int bas=1;
	int son=1e14;
	while(bas<son)
    {
        int orta=(bas+son)/2;
        if(check(orta))
            son=orta;
        else bas=orta+1;
    }
    cout<<bas;
}

• Subtask 1: 0 / 50
• Subtask 2: 0 / 50