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dev-jonghoonpark committed Jul 16, 2024
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---
layout: post
title: (Leetcode) 62 - Maximum Product Subarray 풀이
categories: [스터디-알고리즘]
tags:
[자바, java, 리트코드, Leetcode, 알고리즘, matrix, dynamic programming, dp]
date: 2024-07-16 15:30:00 +0900
toc: true
---

기회가 되어 [달레님의 스터디](https://github.com/DaleStudy/leetcode-study)에 참여하여 시간이 될 때마다 한문제씩 풀어보고 있다.

[https://neetcode.io/practice](https://neetcode.io/practice)

---

[https://leetcode.com/problems/unique-paths/](https://leetcode.com/problems/unique-paths/)

어렸을 때 풀었던 확률 문제가 떠오르는 문제이다. 그 때 했던 풀이 그대로 코드로 옮겨보았다.

## 내가 작성한 풀이

```java
class Solution {
public int uniquePaths(int m, int n) {
int[][] matrix = new int[m][n];
matrix[0][0] = 1;

Deque<Coordinate> deque = new ArrayDeque<>();
deque.addLast(new Coordinate(1, 0));
deque.addLast(new Coordinate(0, 1));
while (!deque.isEmpty()) {
Coordinate coordinate = deque.removeFirst();
if (coordinate.x >= m || coordinate.y >= n || matrix[coordinate.x][coordinate.y] != 0) {
continue;
}

int top = coordinate.y > 0 ? matrix[coordinate.x][coordinate.y - 1] : 0;
int left = coordinate.x > 0 ? matrix[coordinate.x - 1][coordinate.y] : 0;
matrix[coordinate.x][coordinate.y] = top + left;

deque.addLast(new Coordinate(coordinate.x + 1, coordinate.y));
deque.addLast(new Coordinate(coordinate.x, coordinate.y + 1));
}

return matrix[m - 1][n - 1];
}
}

class Coordinate {
int x;
int y;

public Coordinate(int x, int y) {
this.x = x;
this.y = y;
}
}
```

### TC, SC

시간 복잡도는 `O(m * n)` 공간 복잡도는 `O(m * n)` 이다.

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