oj.uz

Submission #909666

# Submission time Handle Problem Language Result Execution time Memory
909666 2024-01-17T10:26:37 Z schzeey Watching (JOI13_watching) C++14
100 / 100
 572 ms 30460 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long
int n, a, b;
vector <int> arr;
bool check(int ans){
    vector<vector<int>> dp(n+1, vector<int>(a+1, 0));
    arr[0] = ans*-1;
    for (int i = 1; i <= n; ++i){
        int pa = i, pb = i;
        do pa--; while(pa != 0 && arr[i]-arr[pa] < ans);
        do pb--; while(pb != 0 && arr[i]-arr[pb] < 2*ans);
        /*int pa = 0, pb = 0;
        while (pa+1 < i && arr[i]-arr[pa+1] >= ans) pa++;
        while (pb+1 < i && arr[i]-arr[pb+1] >= 2*ans) pb++;*/
        for (int j = 0; j < a+1; ++j){
            if (j == 0) dp[i][j] = dp[pb][j]+1;
            else dp[i][j] = min(dp[pb][j]+1, dp[pa][j-1]);
        }
    }
    return *min_element(dp[n].begin(), dp[n].end()) <= b;
}

int32_t main(){
    cin >> n >> a >> b;
    arr.resize(n+1);
    for (int i = 1; i <= n; ++i) cin >> arr[i];
    if (a+b >= n) return cout<<1, 0;
    sort(arr.begin(), arr.end());
    //for (auto e: arr) cout << e << " ";
    int lf = 0, ri = 1e9+128;
    while (lf <= ri){
        int mid = (lf+ri)/2;
        //cout << mid << " ";
        if (check(mid)) ri = mid-1;
        else lf = mid+1;
    }
    cout << lf;
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 52 ms 344 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 19 ms 604 KB Output is correct
8 Correct 38 ms 2496 KB Output is correct
9 Correct 193 ms 12412 KB Output is correct
10 Correct 572 ms 30460 KB Output is correct
11 Correct 25 ms 1896 KB Output is correct
12 Correct 268 ms 15980 KB Output is correct
13 Correct 24 ms 604 KB Output is correct
14 Correct 26 ms 900 KB Output is correct
15 Correct 16 ms 764 KB Output is correct