82 lines
2.1 KiB
Rust
82 lines
2.1 KiB
Rust
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/**
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* [54] Spiral Matrix
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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 spiral_order(matrix: Vec<Vec<i32>>) -> Vec<i32> {
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let (height, width) = (matrix.len() as i32, matrix[0].len() as i32);
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let mut result = Vec::with_capacity((height * width) as usize);
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let mut matrix = matrix;
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let directions = vec![(0, 1), (1, 0), (0, -1), (-1, 0)];
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let mut pos: (i32, i32) = (0, 0);
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let mut direction = 0;
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loop {
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result.push(matrix[pos.0 as usize][pos.1 as usize]);
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matrix[pos.0 as usize][pos.1 as usize] = i32::MAX;
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let mut flag = true;
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let mut count = 0;
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while flag {
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if count > 4 {
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break;
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}
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let next_pos = (
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pos.0 + directions[direction].0,
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pos.1 + directions[direction].1,
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);
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if next_pos.0 < 0 || next_pos.0 >= height || next_pos.1 < 0 || next_pos.1 >= width {
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direction = (direction + 1) % 4;
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count += 1;
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continue;
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} else {
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if (matrix[next_pos.0 as usize][next_pos.1 as usize] == i32::MAX) {
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direction = (direction + 1) % 4;
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count += 1;
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continue;
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}
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}
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pos = next_pos;
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flag = false;
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}
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if flag {
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break;
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}
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}
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result
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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_54() {
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assert_eq!(
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vec![1, 2, 3, 6, 9, 8, 7, 4, 5],
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Solution::spiral_order(vec![vec![1, 2, 3], vec![4, 5, 6], vec![7, 8, 9]])
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);
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assert_eq!(
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vec![1, 2, 3, 4, 8, 12, 11, 10, 9, 5, 6, 7],
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Solution::spiral_order(vec![
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vec![1, 2, 3, 4],
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vec![5, 6, 7, 8],
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vec![9, 10, 11, 12]
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])
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);
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}
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}
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