Submission #1150320

#	Time	Username	Problem	Language	Result	Execution time	Memory
1150320		asdfghqwert	Watching (JOI13_watching)	C++20	50 / 100	1095 ms	16440 KiB

watching

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int maxn = 1e5 + 8;// Adjust N as we need nNNNn
int dp[2008][2008];
int n , q , p , a[maxn];
bool s(int w){
    for(int i = 1 ; i <= n ; i++){
        int s1 =  lower_bound(a  , a + n + 1 , a[i] - w + 1) - a - 1, s2 =  lower_bound(a , a + n + 1 , a[i] - 2 * w + 1) - a - 1;
        dp[i][0] = dp[s1][0] + 1;  
        //cout << i << ' ' << s1 << ' ' << s2 << "index\n";
        for(int j = 1 ; j <= q ; j++){
            dp[i][j] = min(dp[s1][j] + 1 ,dp[s2][j - 1]);
        //    cout << i << ' ' << j << ' ' << dp[i][j] << "\n";
        }
    }
    return (dp[n][q] <= p );
}
int main(){
    ios::sync_with_stdio(0); cin.tie(0);
    cin >> n >> p >> q;a[0] = -2e9;
    for(int i = 1 ; i <= n ; i++)cin >> a[i];
    sort(a, a + n + 1);
    int l = 1  , r = 1e9;
    while(l < r){
        int mid = (r - l) / 2 + l;
        if(s(mid))r = mid;
        else l = mid + 1;
    }
    cout << l;
}

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