oj.uz

Submission #472940

# Submission time Handle Problem Language Result Execution time Memory
472940 2021-09-14T15:28:41 Z Joo Watching (JOI13_watching) C++17
100 / 100
 211 ms 16008 KB 
#include <bits/stdc++.h>
#define DEBUG false
using namespace std;

const int N = 2e3+10;
int n,P,Q,dp[N][N];

main(){
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin >> n >> P >> Q;
    vector<int> a(n+1, 0);
    for(int i=1; i<=n; i++){
        cin >> a[i];
    }
    sort(a.begin(), a.end());
    if(P+Q >= n){
        cout << "1\n";
        return 0;
    }

    int l = 1, r = 1e9, ans = -1;
    while(l <= r){
        int mid = (l+r)/2;
        for(int i=1, j1, j2; i<=n; i++){

            j1 = lower_bound(a.begin()+1, a.end(), a[i]-2*mid+1)-a.begin();
            j2 = lower_bound(a.begin()+1, a.end(), a[i]-mid+1)-a.begin();

            for(int q=0; q<=Q; q++){
                dp[i][q] = 1e9;
                if(q > 0){
                    dp[i][q] = dp[j1-1][q-1];
                }
                dp[i][q] = min(dp[i][q], dp[j2-1][q]+1);
            }
        }

        if(dp[n][Q] <= P){
            ans = mid;
            r = mid-1;
        }else{
            l = mid+1;
        }
    }
    cout << ans << "\n";
}

Compilation message

watching.cpp:8:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    8 | main(){
      | ^~~~

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 716 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 716 KB Output is correct
8 Correct 1 ms 716 KB Output is correct
9 Correct 1 ms 716 KB Output is correct
10 Correct 1 ms 716 KB Output is correct
11 Correct 1 ms 716 KB Output is correct
12 Correct 1 ms 716 KB Output is correct
13 Correct 1 ms 716 KB Output is correct
14 Correct 1 ms 716 KB Output is correct
15 Correct 1 ms 716 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 8268 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 8 ms 8396 KB Output is correct
8 Correct 95 ms 14156 KB Output is correct
9 Correct 24 ms 9316 KB Output is correct
10 Correct 18 ms 9036 KB Output is correct
11 Correct 211 ms 15992 KB Output is correct
12 Correct 122 ms 16008 KB Output is correct
13 Correct 10 ms 8396 KB Output is correct
14 Correct 10 ms 8396 KB Output is correct
15 Correct 11 ms 8396 KB Output is correct