제출 #1281705

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1281705		hanguyendanghuy	Watching (JOI13_watching)	C++20	0 / 100	1 ms	576 KiB

watching

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
#define fi first
#define se second
const ll MAXN=2e3+5,INF=1e9,MOD=1e9+7;
ll n,m,i,j,k,p,a[MAXN],dp[MAXN][MAXN];
bool check(ll range){
	for(ll i=1;i<=m;i++)
		for(j=1;j<=k;j++) dp[i][j]=0;
	dp[0][0]=1;
	for(i=0;i<=m;i++){
		for(j=0;j<=k;j++){
			ll cur=a[dp[i][j]]+range;
			ll nextsm=upper_bound(a+1,a+n+1,cur-1)-a,nextl=upper_bound(a+1,a+n+1,cur+range-1)-a;
			dp[i][j+1]=nextl;
			dp[i+1][j]=nextsm;
		}
	}
	if(dp[m][k]>n) return true;
	return false;
}
int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);cout.tie(0);
	cin>>n>>m>>k;
	for(i=1;i<=n;i++) cin>>a[i];
	sort(a+1,a+n+1);
	if(m+k>=n){
		cout<<1;
		return 0;
	}
	ll l=1,r=INF,best=0;
	while(l<r){
		ll m=(l+r)/2;
		if(check(m))
			r=m-1,best=r;
		else l=m+1;
	}
	cout<<best;
}
	

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