1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
pub struct Solution;
#[allow(unused)]
impl Solution {
pub fn max_profit(prices: Vec<i32>) -> i32 {
let mut min_price = i32::MAX;
let mut max_profit = 0;
for price in prices {
min_price = min_price.min(price);
max_profit = max_profit.max(price - min_price);
}
max_profit
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test() {
assert_eq!(Solution::max_profit(vec![7, 1, 5, 3, 6, 4]), 5);
assert_eq!(Solution::max_profit(vec![1, 2, 3, 4, 5]), 4);
assert_eq!(Solution::max_profit(vec![7, 6, 4, 3, 1]), 0);
}
}