Submission #1207548

#	Time	Username	Problem	Language	Result	Execution time	Memory
1207548		ricardsjansons	Watching (JOI13_watching)	C++20	100 / 100	347 ms	472 KiB

watching

#include <bits/stdc++.h>
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,popcnt,lzcnt")
using namespace std;

const int N=2005;

int n,p,q;
int a[N];

vector<vector<int>>dp(2,vector<int>(N));

bool f(int w){
    for(int i=0;i<=p;i++){
        if(i){
            dp[0]=dp[1];
        }else{
            dp[0].assign(q+2,0);
        }
        for(int j=0;j<=q;j++){
            int pos=dp[0][j];
            pos=min(pos,n-1);
            dp[1][j]=upper_bound(a+pos+1,a+n+1,a[pos+1]+w-1)-a-1;
            int&x=dp[0][j+1];
            x=max(x,(int)(upper_bound(a+pos+1,a+n+1,a[pos+1]+2*w-1)-a-1));
        }
    }
    //cout<<dp[0][q]<<endl;
    return dp[0][q]>=n;

}

int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);
    cin>>n>>p>>q;
    for(int i=1;i<=n;i++){
        cin>>a[i];
    }
    if(n<=p+q){
        cout<<1;
        return 0;
    }
    sort(a+1,a+n+1);
    //cout<<f(4)<<endl;
    int l=1,r=1e9;
    while(l<r){
        int mid=(l+r)/2;
        if(f(mid)){
            r=mid;
        }else{
            l=mid+1;
        }
    }
    cout<<l;
}

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