Submission #77312

#	Time	Username	Problem	Language	Result	Execution time	Memory
77312		MohamedAhmed0	Watching (JOI13_watching)	C++14	100 / 100	281 ms	16564 KiB

watching

#include <bits/stdc++.h>

using namespace std;

int arr[2001] , dp[2001][2001] , x , n;

int solve(int idx , int r , int covered)
{    if(idx == n)
        return 0 ;
    int &ret = dp[idx][r] ;
    if(covered > arr[idx])
        return solve(idx+1 , r , covered);
    if(ret != -1)
        return ret ;
    if(r >= n-idx)
        return 0 ;
    ret = solve(idx+1 , r , arr[idx] + x * 2) + 1 ;
    if(r > 0)
        ret = min(ret , solve(idx+1 , r-1 , arr[idx] + x));
    return ret ;
}
int main()
{
    int p , q;
    cin>>n>>p>>q ;
    if(p+q >= n)
        return cout<<1 , 0 ;
    for(int i = 0 ; i < n ; ++i)
        cin>>arr[i] ;
    sort(arr , arr + n);
    int l = 1 , r = 1e9 , ans = 1e9 ;
    while(l <= r)
    {
        memset(dp , -1 , sizeof(dp));
        int mid = (l + r) >> 1 ;
        x = mid ;
        if(solve(0 , p , -1) <= q)
            r = mid-1 , ans = min(ans , mid);
        else
            l = mid+1;
    }
    return cout<<ans , 0 ;
}

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