Submission #499111

#	Time	Username	Problem	Language	Result	Execution time	Memory
499111		Kipras	Swimming competition (LMIO18_plaukimo_varzybos)	C++14	100 / 100	434 ms	14856 KiB

plaukimo_varzybos

#include <bits/stdc++.h>

typedef long long ll;
using namespace std;

const int maxN = 1e6+10;
const int inf = 2147000000;

int n, mini, maxi;
int a[maxN];
int dp[maxN];

bool test(int v){

    fill(dp, dp+maxN, 0);

    dp[0]=1;

    int i, j=1;
    for(i = 0; i < n; i++){
        if(i>1)dp[i]+=dp[i-1];
        if(dp[i]<=0)continue;
        j=max(j, i+1);
        while(j<n&&a[j]-a[i]<=v)j++;

        if(i+mini<=min(i+maxi, j)){
            dp[i+mini]++;
            dp[min(i+maxi, j)+1]--;
        }
    }

    dp[n]+=dp[n-1];
    return dp[n]>0;
}

int solve(){

    int l = -1, h = inf;

    while(l<h-1){
        int mid = (h+l)/2;
        if(test(mid))h=mid;
        else l=mid;
    }

    return h;

}

int main()
{

    ios_base::sync_with_stdio(0);cin.tie(nullptr);

    cin>>n>>mini>>maxi;
    for(int i = 0; i < n; i++)cin>>a[i];
    sort(a, a+n);
    cout<<solve();

    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 30 / 30
• Subtask 4: 40 / 40