# Shortest Common Supersequence

Given strings `a`

and `b`

, return the length of the shortest string that has both `a`

and `b`

as subsequences.

https://binarysearch.com/problems/Shortest-Common-Supersequence

## Examples

### Example 1

**Input**

- a =
`bell`

- b =
`yellow`

**Output**

- answer =
`7`

**Explanation**

One possible solution is `"ybellow"`

.

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