[백준]1654-랜선 자르기(설명X)

#include <cstdio>
 
int main()
{
    int K, N, ans = 0;
    scanf("%d %d", &K, &N);
    int* lan = new int[K];
    unsigned long long max = 0;
    for (size_t i = 0; i < K; i++) {
        scanf("%d", &lan[i]);
        max = max < lan[i] ? lan[i] : max;
    }
    unsigned long long min = 1, ea, mid;
    while (max >= min) {
        ea = 0;
        mid = (max + min) / 2;
        for (size_t j = 0; j < K; j++)
            ea += lan[j] / mid;
 
        if (ea >= N) {
            ans = mid > ans ? mid : ans;
            min = mid + 1;
        }
        else
            max = mid - 1;
    }
    printf("%d", ans);
    return 0;
}