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#!/bin/sh
//usr/bin/env rustc --test $0 -o kachow && ./kachow --nocapture; rm -f kachow ; exit
fn max_diff(a: &[i32]) -> i32 {
let n = a.len();
let mut pairs = Vec::new();
for i in 0..n {
for j in i + 1..n {
pairs.push((a[i] * a[j], i, j));
}
}
let mut md = 0;
for i in 0..pairs.len() {
for j in i + 1..pairs.len() {
let (p1, x1, y1) = pairs[i];
let (p2, x2, y2) = pairs[j];
if x1 != x2 && x1 != y2 && y1 != x2 && y1 != y2 {
md = md.max((p1 - p2).abs());
}
}
}
md
}
#[test]
fn example() {
assert_eq!(max_diff(&[5, 9, 3, 4, 6]), 42);
assert_eq!(max_diff(&[1, -2, 3, -4]), 10);
assert_eq!(max_diff(&[-3, -1, -2, -4]), 10);
assert_eq!(max_diff(&[10, 2, 0, 5, 1]), 50);
assert_eq!(max_diff(&[7, 8, 9, 10, 10]), 44);
}
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