47 lines
952 B
Rust
47 lines
952 B
Rust
/**
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* [46] Permutations
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*/
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pub struct Solution {}
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// submission codes start here
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impl Solution {
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pub fn permute(nums: Vec<i32>) -> Vec<Vec<i32>> {
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let mut result = vec![];
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let mut output = nums.clone();
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Self::search(output.len(), &mut output, &mut result, 0);
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result
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}
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fn search(length: usize, output: &mut Vec<i32>, result: &mut Vec<Vec<i32>>, pos: usize) {
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if length == pos {
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result.push(output.clone());
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return;
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}
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for i in pos..length {
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Self::swap(output, i, pos);
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Self::search(length, output, result, pos + 1);
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Self::swap(output, i, pos);
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}
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}
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fn swap(output: &mut Vec<i32>, a: usize, b: usize) {
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let temp = output[a];
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output[a] = output[b];
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output[b] = temp;
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}
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}
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// submission codes end
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_46() {}
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}
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