Good afternoon! Here's our prompt for today.

Can you determine the deletion distance between two strings? Let's define the deletion distance as the numbers of characters needed to delete from two strings to make them equal.

For example, the deletion distance of algo and daily is 5. The reason is we can delete the go (2 deletion) in algo, and the d, i and y (3 deletions) in daily.

Constraints

• Length of both the strings <= 1000
• The strings can be empty
• Take into consideration all the ASCII characters
• Let m and n be the the lengths of string 1 and string 2
• Expected time complexity O(m*n)
• Expected space complexity : O(m*n)

Try to solve this here or in Interactive Mode.

How do I practice this challenge?

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  console.log('PASSED: ' + "deletionDistance('some', 'thing') should return 9");

var assert = require('assert');

​

function deletionDistance(str1, str2) {

  return '';

}

​

class Graph {

  constructor() {

    this.adjacencyList = new Map();

    this.verticesCount = 0;

  }

​

  addVertex(nodeVal) {

    this.adjacencyList.set(nodeVal, []);

    this.verticesCount++;

  }

​

  addEdge(src, dest) {

    this.adjacencyList.get(src).push(dest);

    this.adjacencyList.get(dest).push(src);

    // push to both adjacency lists

  }

​

  removeVertex(val) {

    if (this.adjacencyList.get(val)) {

      this.adjacencyList.delete(val);

    }

​

    this.adjacencyList.forEach((vertex) => {

We'll now take you through what you need to know.

How do I use this guide?