Submission #1071465

#	Time	Username	Problem	Language	Result	Execution time	Memory
1071465		FIFI_cpp	Watching (JOI13_watching)	C++17	100 / 100	155 ms	16132 KiB

watching

#include <bits/stdc++.h>
using namespace std;
 
#define ll long long
#define pll pair<ll, ll>
#define pii pair<int, int>
#define fs first
#define sc second
#define pb push_back
 
void solve() {
    int n,p,q;
    cin>>n>>p>>q;
    int a[n+1];
    for(int i=1;i<=n;i++)cin>>a[i];
    sort(a+1,a+n+1);
    p=min(p,n);
    q=min(q,n);
    int l=1,r=1e9;
    while(l<r){
        int m=(l+r)/2;
        int dp[n+1][q+1];
        for(int i=0;i<=q;i++)dp[0][i]=0;
        int idx1=1,idx2=1;
        for(int i=1;i<=n;i++){
            while(a[i]-a[idx1]+1>m)idx1++;
            while(a[i]-a[idx2]+1>2*m)idx2++;
            for(int j=0;j<=q;j++){
                dp[i][j]=dp[idx1-1][j]+1;
                if(j){
                    dp[i][j]=min(dp[i][j],dp[idx2-1][j-1]);
                }
            }
        }
        if(dp[n][q]<=p)r=m;
        else l=m+1;
    }
    cout<<l;
}
 
int main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
 
    solve();
}

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