best-time-to-buy-and-sell-stock-ii.rs

struct Solution;

impl Solution {
    pub fn max_profit(prices: Vec<i32>) -> i32 {
        let mut ans = 0;
        for i in 1..prices.len() {
            let value = prices[i] - prices[i - 1];
            if value > 0 {
                ans += value;
            }
        }
        ans
    }
}

fn main() {
    println!("{}", Solution::max_profit(vec![7, 1, 5, 3, 6, 4]));
}

#[cfg(test)]
mod tests {
    use crate::Solution;

    #[test]
    fn test_impl1() {
        assert_eq!(Solution::max_profit(vec![7, 1, 5, 3, 6, 4]), 7);
        assert_eq!(Solution::max_profit(vec![1, 2, 3, 4, 5]), 4);
        assert_eq!(Solution::max_profit(vec![7, 6, 4, 3, 1]), 0);
    }
}