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pub fn merge_sort<T: PartialOrd + Copy>(s: &mut [T]) {
let len = s.len();
if len < 2 {
return;
}
let mid = len / 2;
merge_sort(&mut s[..mid]);
merge_sort(&mut s[mid..]);
let mut tmp = Vec::with_capacity(len);
let mut i = 0;
let mut j = mid;
while i < mid && j < len {
if s[i] < s[j] {
tmp.push(s[i]);
i += 1;
} else {
tmp.push(s[j]);
j += 1;
}
}
if i < mid {
tmp.extend_from_slice(&s[i..mid]);
} else if j < len {
tmp.extend_from_slice(&s[j..len]);
}
s.copy_from_slice(&tmp[..]);
}