oj.uz

Submission #1033284

# Submission time Handle Problem Language Result Execution time Memory
1033284 2024-07-24T15:59:52 Z adaawf Watching (JOI13_watching) C++17
100 / 100
 153 ms 15964 KB 
#include <iostream>
#include <algorithm>
using namespace std;
int n, p, q, a[2005], f[2005][2005];
bool check(int x) {
    for (int i = 1; i <= n; i++) {
        for (int j = 0; j <= p; j++) {
            f[i][j] = 1e9;
        }
    }
    for (int i = 1; i <= n; i++) {
        int h = upper_bound(a + 1, a + n + 1, a[i] - x) - a, k = upper_bound(a + 1, a + n + 1, a[i] - x * 2) - a;
        //cout << h << " " << k << " " << x << " " << i << '\n';
        for (int j = 0; j <= p; j++) {
            if (j != 0) f[i][j] = min(f[i][j], f[h - 1][j - 1]);
            f[i][j] = min(f[i][j], f[k - 1][j] + 1);
            //cout << i << " " << j << " " << f[i][j] << '\n';
        }
    }
    for (int j = 0; j <= p; j++) {
        if (f[n][j] <= q) return true;
    }
    return false;
}
int main() {
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    cin >> n >> p >> q;
    for (int i  =1; i <= n; i++) {
        cin >> a[i];
    }
    sort(a + 1, a + n + 1);
    if (p + q >= n) {
        cout << 1;
        return 0;
    }
    int l = 1, r = 1e9, res;
    while (l <= r) {
        int mid = (l + r) / 2;
        if (check(mid) == true) {
            res = mid;
            r = mid - 1;
        }
        else l = mid + 1;
    }
    cout << res;
}

Compilation message

watching.cpp: In function 'int main()':
watching.cpp:46:13: warning: 'res' may be used uninitialized in this function [-Wmaybe-uninitialized]
   46 |     cout << res;
      |             ^~~

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 860 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 460 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 860 KB Output is correct
8 Correct 0 ms 860 KB Output is correct
9 Correct 1 ms 860 KB Output is correct
10 Correct 1 ms 860 KB Output is correct
11 Correct 1 ms 856 KB Output is correct
12 Correct 1 ms 860 KB Output is correct
13 Correct 0 ms 860 KB Output is correct
14 Correct 0 ms 860 KB Output is correct
15 Correct 1 ms 860 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 8284 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 344 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 6 ms 8536 KB Output is correct
8 Correct 18 ms 9304 KB Output is correct
9 Correct 66 ms 14380 KB Output is correct
10 Correct 153 ms 15964 KB Output is correct
11 Correct 15 ms 9052 KB Output is correct
12 Correct 83 ms 15964 KB Output is correct
13 Correct 8 ms 8540 KB Output is correct
14 Correct 9 ms 8540 KB Output is correct
15 Correct 9 ms 8536 KB Output is correct