LeetCode 875. Koko Eating Bananas

Problem Statement

impl Solution {
    pub fn min_eating_speed(piles: Vec<i32>, h: i32) -> i32 {
        let (mut l, mut r) = (1, *piles.iter().max().unwrap());

        while l < r {
            let mid = l + (r - l) / 2;
            let mut total = 0;
            for val in &piles {
                total += (*val as f32 / mid as f32).ceil() as i32;
            }
            if total > h {
                l = mid + 1;
            } else {
                r = mid;
            }
        }

        return l;
    }
}