Submission #1164760

#	Time	Username	Problem	Language	Result	Execution time	Memory
1164760		ReLice	Watching (JOI13_watching)	C++20	100 / 100	339 ms	16228 KiB

watching

#include <bits/stdc++.h>
#define ll int
#define ld double
#define pb push_back
#define pf push_front
#define ins insert
#define fr first
#define sc second
#define endl "\n"
#define ar array
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()

using namespace std;
void start(){ios_base::sync_with_stdio(NULL);cin.tie(nullptr);cout.tie(nullptr);}

const ll inf = 1e9;
const ll mod = 1e9 + 7;
const ll N = 2e3 + 8;

ll dp[N][N];

void solve() {
    ll i, j;

    ll n, p, q;
    cin>>n>>p>>q;

    vector<ll> a(n);
    for(i=0;i<n;i++) cin>>a[i];
    sort(all(a));


    if(p + q >= n) {
        cout<<1<<endl;
        return;
    }

    ll l = 0, r = (a[n - 1] - a[0] + 3) / 3;
    ll low, mn, m;

    while(l + 1 < r){
        m = (l + r) / 2;

        memset(dp, 0x3f, sizeof(dp));
        dp[0][0] = 0;

        for(i=0;i<n;i++){
            for(j=0;j<=p;j++){
                if(dp[i][j] > q) continue;
                if(j < p){
                    low = lower_bound(all(a), a[i] + m) - a.begin();

                    dp[low][j + 1] = min(dp[low][j + 1], dp[i][j]);
                }
                if(dp[i][j] < q){
                    low = lower_bound(all(a), a[i] + m * 2) - a.begin();

                    dp[low][j] = min(dp[low][j], dp[i][j] + 1);
                }
            }
        }

        mn = inf;
        for(i=0;i<=p;i++) mn = min(mn, dp[n][i]);

        if(mn <= q) r = m;
        else l = m;
    }

    cout<<r<<endl;
}

signed main(){
    start();

    ll t = 1;
    //cin>>t;

    while(t--) solve();
}

/*

*/

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