Submission #282216

#	Time	Username	Problem	Language	Result	Execution time	Memory
282216		jainbot27	Watching (JOI13_watching)	C++17	100 / 100	511 ms	16332 KiB

watching

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n, p, q;
    cin >> n >> p >> q;
    if(p + q >= n) {
        cout <<"1\n";
        return 0;
    }
    vector<int> a(n);
    for(int&A:a) cin >> A;
    sort(a.begin(), a.end());
    int lo = 1, hi = 1e9;
    while(lo <= hi){
        int mid = (lo + hi) / 2;
        vector<vector<int>> dp(n + 1, vector<int>(n + 1, -1));
        vector<int> P(n + 1), Q(n + 1);
        for(int i=0; i < n; i++){
            P[i] = (lower_bound(a.begin(), a.end(), a[i] + mid) - a.begin()) - i;
        }
        for(int i=0; i < n; i++){
            Q[i] = (lower_bound(a.begin(), a.end(), a[i] + mid * 2) - a.begin()) - i;
        }
        dp[0][0] = 0;
        bool g = 0;
        for(int i=0; i <= p; i++){
            for(int j=0; j <= q; j++){
                if(dp[i][j] == n){
                    g = 1;
                }
                if(dp[i][j] != -1){
                    dp[i + 1][j] = max(dp[i+1][j], P[dp[i][j]] + dp[i][j]);
                    dp[i][j + 1] = max(dp[i][j + 1], Q[dp[i][j]] + dp[i][j]);
                }
            }
        }
        g?hi=mid-1:lo=mid+1;
    }
    cout << lo << endl;
}

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