rust_test/src/main.rs

struct Solution;
impl Solution {
    pub fn count_hill_valley(nums: Vec<i32>) -> i32 {
        let mut down = false;
        for i in 1..nums.len() {
            if nums[i] != nums[0]{
                down = nums[i] < nums[0];
                break;
            }
        }
        let mut ans = 0;
        for i in 2..nums.len() {
            if nums[i] == nums[i-1]
            {
                continue;
            }
            if down && nums[i] >nums[i-1]
            {
                ans += 1;
                down = false;
                continue;
            }
            if !down && nums[i] < nums[i-1] {
                ans += 1;
                down = true;
                continue;
            }
        }
        ans
    }
}

fn main() {
    let sl = Solution::count_hill_valley(vec![6,6,5,5,4,1]);
    println!("{}", sl);
}