mirror of https://github.com/rust-lang/rust
55 lines
1.6 KiB
Plaintext
55 lines
1.6 KiB
Plaintext
LL| |//@ compile-flags: -Zinline-mir
|
|
LL| |
|
|
LL| |use std::fmt::Display;
|
|
LL| |
|
|
LL| 1|fn main() {
|
|
LL| 1| permutations(&['a', 'b', 'c']);
|
|
LL| 1|}
|
|
LL| |
|
|
LL| |#[inline(always)]
|
|
LL| 1|fn permutations<T: Copy + Display>(xs: &[T]) {
|
|
LL| 1| let mut ys = xs.to_owned();
|
|
LL| 1| permutate(&mut ys, 0);
|
|
LL| 1|}
|
|
LL| |
|
|
LL| 16|fn permutate<T: Copy + Display>(xs: &mut [T], k: usize) {
|
|
LL| 16| let n = length(xs);
|
|
LL| 16| if k == n {
|
|
LL| 6| display(xs);
|
|
LL| 10| } else if k < n {
|
|
LL| 15| for i in k..n {
|
|
^10
|
|
LL| 15| swap(xs, i, k);
|
|
LL| 15| permutate(xs, k + 1);
|
|
LL| 15| swap(xs, i, k);
|
|
LL| 15| }
|
|
LL| 0| } else {
|
|
LL| 0| error();
|
|
LL| 0| }
|
|
LL| 16|}
|
|
LL| |
|
|
LL| 16|fn length<T>(xs: &[T]) -> usize {
|
|
LL| 16| xs.len()
|
|
LL| 16|}
|
|
LL| |
|
|
LL| |#[inline]
|
|
LL| 30|fn swap<T: Copy>(xs: &mut [T], i: usize, j: usize) {
|
|
LL| 30| let t = xs[i];
|
|
LL| 30| xs[i] = xs[j];
|
|
LL| 30| xs[j] = t;
|
|
LL| 30|}
|
|
LL| |
|
|
LL| 6|fn display<T: Display>(xs: &[T]) {
|
|
LL| 24| for x in xs {
|
|
^18
|
|
LL| 18| print!("{}", x);
|
|
LL| 18| }
|
|
LL| 6| println!();
|
|
LL| 6|}
|
|
LL| |
|
|
LL| |#[inline(always)]
|
|
LL| 0|fn error() {
|
|
LL| 0| panic!("error");
|
|
LL| |}
|
|
|