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n0047_permutations_ii.rs
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/**
* [47] Permutations II
*
* Given a collection of numbers that might contain duplicates, return all possible unique permutations.
*
* Example:
*
*
* Input: [1,1,2]
* Output:
* [
* [1,1,2],
* [1,2,1],
* [2,1,1]
* ]
*
*
*/
pub struct Solution {}
// submission codes start here
impl Solution {
pub fn permute_unique(nums: Vec<i32>) -> Vec<Vec<i32>> {
let mut nums = nums;
nums.sort_unstable();
Solution::permute(nums)
}
fn permute(mut nums: Vec<i32>) -> Vec<Vec<i32>> {
if nums.len() <= 1 {
return vec![nums];
}
let mut prev: Option<i32> = None;
let mut res = Vec::new();
for (i, &num) in nums.iter().enumerate() {
if prev.is_some() && prev.unwrap() == num {
continue;
} else {
prev = Some(num)
}
let mut sub = nums.clone();
sub.remove(i);
let mut permutations: Vec<Vec<i32>> = Solution::permute(sub)
.into_iter()
.map(|x| {
let mut x = x;
x.push(num);
x
})
.collect();
res.append(&mut permutations);
}
res
}
}
// submission codes end
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_47() {
assert_eq!(
Solution::permute(vec![1, 1, 2]),
vec![vec![2, 1, 1], vec![1, 2, 1], vec![1, 1, 2],]
);
assert_eq!(Solution::permute(vec![1, 1, 1]), vec![vec![1, 1, 1],]);
assert_eq!(
Solution::permute(vec![1, 1, 1, 2]),
vec![
vec![2, 1, 1, 1],
vec![1, 2, 1, 1],
vec![1, 1, 2, 1],
vec![1, 1, 1, 2],
]
);
assert_eq!(
Solution::permute(vec![1, 1, 2, 2, 3, 3]),
vec![
vec![3, 3, 2, 2, 1, 1],
vec![3, 2, 3, 2, 1, 1],
vec![2, 3, 3, 2, 1, 1],
vec![3, 2, 2, 3, 1, 1],
vec![2, 3, 2, 3, 1, 1],
vec![2, 2, 3, 3, 1, 1],
vec![3, 3, 2, 1, 2, 1],
vec![3, 2, 3, 1, 2, 1],
vec![2, 3, 3, 1, 2, 1],
vec![3, 3, 1, 2, 2, 1],
vec![3, 1, 3, 2, 2, 1],
vec![1, 3, 3, 2, 2, 1],
vec![3, 2, 1, 3, 2, 1],
vec![2, 3, 1, 3, 2, 1],
vec![3, 1, 2, 3, 2, 1],
vec![1, 3, 2, 3, 2, 1],
vec![2, 1, 3, 3, 2, 1],
vec![1, 2, 3, 3, 2, 1],
vec![3, 2, 2, 1, 3, 1],
vec![2, 3, 2, 1, 3, 1],
vec![2, 2, 3, 1, 3, 1],
vec![3, 2, 1, 2, 3, 1],
vec![2, 3, 1, 2, 3, 1],
vec![3, 1, 2, 2, 3, 1],
vec![1, 3, 2, 2, 3, 1],
vec![2, 1, 3, 2, 3, 1],
vec![1, 2, 3, 2, 3, 1],
vec![2, 2, 1, 3, 3, 1],
vec![2, 1, 2, 3, 3, 1],
vec![1, 2, 2, 3, 3, 1],
vec![3, 3, 2, 1, 1, 2],
vec![3, 2, 3, 1, 1, 2],
vec![2, 3, 3, 1, 1, 2],
vec![3, 3, 1, 2, 1, 2],
vec![3, 1, 3, 2, 1, 2],
vec![1, 3, 3, 2, 1, 2],
vec![3, 2, 1, 3, 1, 2],
vec![2, 3, 1, 3, 1, 2],
vec![3, 1, 2, 3, 1, 2],
vec![1, 3, 2, 3, 1, 2],
vec![2, 1, 3, 3, 1, 2],
vec![1, 2, 3, 3, 1, 2],
vec![3, 3, 1, 1, 2, 2],
vec![3, 1, 3, 1, 2, 2],
vec![1, 3, 3, 1, 2, 2],
vec![3, 1, 1, 3, 2, 2],
vec![1, 3, 1, 3, 2, 2],
vec![1, 1, 3, 3, 2, 2],
vec![3, 2, 1, 1, 3, 2],
vec![2, 3, 1, 1, 3, 2],
vec![3, 1, 2, 1, 3, 2],
vec![1, 3, 2, 1, 3, 2],
vec![2, 1, 3, 1, 3, 2],
vec![1, 2, 3, 1, 3, 2],
vec![3, 1, 1, 2, 3, 2],
vec![1, 3, 1, 2, 3, 2],
vec![1, 1, 3, 2, 3, 2],
vec![2, 1, 1, 3, 3, 2],
vec![1, 2, 1, 3, 3, 2],
vec![1, 1, 2, 3, 3, 2],
vec![3, 2, 2, 1, 1, 3],
vec![2, 3, 2, 1, 1, 3],
vec![2, 2, 3, 1, 1, 3],
vec![3, 2, 1, 2, 1, 3],
vec![2, 3, 1, 2, 1, 3],
vec![3, 1, 2, 2, 1, 3],
vec![1, 3, 2, 2, 1, 3],
vec![2, 1, 3, 2, 1, 3],
vec![1, 2, 3, 2, 1, 3],
vec![2, 2, 1, 3, 1, 3],
vec![2, 1, 2, 3, 1, 3],
vec![1, 2, 2, 3, 1, 3],
vec![3, 2, 1, 1, 2, 3],
vec![2, 3, 1, 1, 2, 3],
vec![3, 1, 2, 1, 2, 3],
vec![1, 3, 2, 1, 2, 3],
vec![2, 1, 3, 1, 2, 3],
vec![1, 2, 3, 1, 2, 3],
vec![3, 1, 1, 2, 2, 3],
vec![1, 3, 1, 2, 2, 3],
vec![1, 1, 3, 2, 2, 3],
vec![2, 1, 1, 3, 2, 3],
vec![1, 2, 1, 3, 2, 3],
vec![1, 1, 2, 3, 2, 3],
vec![2, 2, 1, 1, 3, 3],
vec![2, 1, 2, 1, 3, 3],
vec![1, 2, 2, 1, 3, 3],
vec![2, 1, 1, 2, 3, 3],
vec![1, 2, 1, 2, 3, 3],
vec![1, 1, 2, 2, 3, 3]
]
);
}
}