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g1401_1500.s1496_path_crossing.readme.md Maven / Gradle / Ivy

1496\. Path Crossing

Easy

Given a string `path`, where `path[i] = 'N'`, `'S'`, `'E'` or `'W'`, each representing moving one unit north, south, east, or west, respectively. You start at the origin `(0, 0)` on a 2D plane and walk on the path specified by `path`.

Return `true` _if the path crosses itself at any point, that is, if at any time you are on a location you have previously visited_. Return `false` otherwise.

**Example 1:**

![](https://assets.leetcode.com/uploads/2020/06/10/screen-shot-2020-06-10-at-123929-pm.png)

**Input:** path = "NES"

**Output:** false

**Explanation:** Notice that the path doesn't cross any point more than once.

**Example 2:**

![](https://assets.leetcode.com/uploads/2020/06/10/screen-shot-2020-06-10-at-123843-pm.png)

**Input:** path = "NESWW"

**Output:** true

**Explanation:** Notice that the path visits the origin twice.

**Constraints:**

*   1 <= path.length <= 104
*   `path[i]` is either `'N'`, `'S'`, `'E'`, or `'W'`.