oj.uz

Submission #987597

# Submission time Handle Problem Language Result Execution time Memory
987597 2024-05-23T06:49:06 Z hengliao Watching (JOI13_watching) C++17
100 / 100
 283 ms 31912 KB 
#include<bits/stdc++.h>
using namespace std;
 
#define F first
#define S second
#define pb push_back
#define vll vector<ll>
#define pll pair<ll, ll>
typedef long long ll;
 
const ll mxN=2005;
const ll inf=1e17;
 
ll n, p, q;
 
ll a[mxN];
ll dp[mxN][mxN];
ll o[mxN];
ll s[mxN];
 
bool check(ll tar){
	for(ll i=0;i<=n;i++){
		for(ll j=0;j<=p;j++){
			dp[i][j]=inf;
		}
	}
	for(ll i=0;i<=p;i++){
		dp[0][i]=0;
	}
	ll pt=0;
	for(ll i=0;i<n;i++){
		while(pt<n && a[pt]-a[i]+1<=tar){
			pt++;
		}
		o[i]=pt;
	}
	//cout<<"dumb "<<o[8]<<'\n';
	pt=0;
	for(ll i=0;i<n;i++){
		while(pt<n && a[pt]-a[i]+1<=2*tar){
			pt++;
		}
		s[i]=pt;
	}
	for(ll i=0;i<n;i++){
		for(ll j=0;j<=p;j++){
			//cout<<i<<' '<<j<<' '<<dp[i][j]<<'\n';
			// take small
			dp[o[i]][j]=min(dp[o[i]][j], dp[i][j]+1);
			//take big
			dp[s[i]][j+1]=min(dp[s[i]][j+1], dp[i][j]);
		}
	}
	//cout<<"checking "<<tar<<' '<<dp[n][p]<<'\n';
	//cout<<q<<' '<<(dp[n][p]<=q)<<'\n';
	return (dp[n][p]<=q);
}
 
void solve(){
	cin>>n>>q>>p;
	for(ll i=0;i<n;i++){
		cin>>a[i];
	}
	sort(a, a+n);
	/*for(ll i=0;i<n;i++){
		cout<<a[i]<<' ';
	}
	cout<<'\n';*/
	if(p+q>=n){
		cout<<1<<'\n';
		return;
	}
 
	ll ans;
	ll l=1, r=1e9+5;
 
	while(l<=r){
		ll mid=(l+r)/2;
		if(check(mid)){
			//cout<<mid<<" good\n";
			ans=mid;
			r=mid-1;
		}
		else{
			//cout<<mid<<" bad\n";
			l=mid+1;
		}
	}
	cout<<ans<<'\n';
 
	//check(8);
}
 
int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
 
	solve();
	return 0;
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2392 KB Output is correct
9 Correct 2 ms 2392 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 1 ms 2392 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 2 ms 2396 KB Output is correct
14 Correct 2 ms 2392 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 31316 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 10 ms 31324 KB Output is correct
8 Correct 115 ms 31672 KB Output is correct
9 Correct 20 ms 31320 KB Output is correct
10 Correct 16 ms 31320 KB Output is correct
11 Correct 283 ms 31912 KB Output is correct
12 Correct 178 ms 31580 KB Output is correct
13 Correct 8 ms 31324 KB Output is correct
14 Correct 7 ms 31324 KB Output is correct
15 Correct 11 ms 31320 KB Output is correct