下⾯程序的运⾏结果为（ ）。
#include <iostream>
#include <algorithm>
bool check(int n, int a[], int k, int dist) {
int cnt = 1;
int last = a[0];
for (int i = 1; i < n; i++) {
if (a[i] - last >= dist) {
cnt++;
last = a[i];
}
}
return cnt >= k;
}
int solve(int n, int a[], int k) {
std::sort(a, a + n);
int l = 0;
int r = a[n - 1] - a[0];
while (l < r) {
int mid = (l + r + 1) / 2;
if (check(n, a, k, mid))
l = mid;
else
r = mid - 1;
}
return l;
}
int main() {
int a[] = {1, 2, 8, 4, 9};
int n = 5;
int k = 3;
std::cout << solve(n, a, k) << std::endl;
return 0;
}
- A.
2 - B.
3 - C.
4 - D.
5