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Submission #867267

# Submission time Handle Problem Language Result Execution time Memory
867267 2023-10-28T04:40:06 Z Koyote Watching (JOI13_watching) C++11
100 / 100
 169 ms 16216 KB 
#include <bits/stdc++.h>
using namespace std;

const int maxN = 2e3 + 2;
int n, a, b, x[maxN], dp[maxN][maxN];

inline bool binF(int searchVal) {
    memset(dp, 0x7f, sizeof(dp));
    dp[0][0] = 0;

    for (int i = 1; i <= n; i++) {
        int sw = 1, sw2 = 1;
        while (x[i] - x[sw] + 1 > searchVal) sw++;
        while (x[i] - x[sw2] + 1 > (searchVal << 1)) sw2++;
        for (int j = 0; j <= a; j++) {
            dp[i][j] = dp[sw2 - 1][j] + 1;
            if (j > 0) dp[i][j] = min(dp[i][j], dp[sw - 1][j - 1]);
        }
    }

    for (int i = 0; i <= a; i++) if (dp[n][i] <= b)
        return true;
    return false;
}

int main() {
    cin.tie(nullptr)->sync_with_stdio(false);
    cin >> n >> a >> b;
    if (a + b >= n) return cout << 1 << '\n', 0;
    for (int i = 1; i <= n; i++) cin >> x[i];
    sort(x + 1, x + n + 1);

    int lo = 1, hi = int(1e9), ans = hi;
    while (lo <= hi) {
        int mid = (lo + hi) >> 1;
        if (binF(mid)) ans = mid, hi = mid - 1;
        else lo = mid + 1;
    }
    cout << ans << '\n';
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 28 ms 15964 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 31 ms 16140 KB Output is correct
4 Correct 0 ms 600 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 15 ms 16152 KB Output is correct
8 Correct 12 ms 15960 KB Output is correct
9 Correct 16 ms 16148 KB Output is correct
10 Correct 13 ms 16148 KB Output is correct
11 Correct 15 ms 15964 KB Output is correct
12 Correct 14 ms 15964 KB Output is correct
13 Correct 13 ms 16144 KB Output is correct
14 Correct 19 ms 16148 KB Output is correct
15 Correct 28 ms 16216 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 35 ms 15964 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 0 ms 344 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 60 ms 16132 KB Output is correct
8 Correct 76 ms 15960 KB Output is correct
9 Correct 108 ms 16132 KB Output is correct
10 Correct 169 ms 16212 KB Output is correct
11 Correct 69 ms 16128 KB Output is correct
12 Correct 120 ms 15964 KB Output is correct
13 Correct 58 ms 16124 KB Output is correct
14 Correct 62 ms 15960 KB Output is correct
15 Correct 68 ms 15964 KB Output is correct