---
title: 'Part 1 Session 2'
---

###### tags: `Part 1` `Session 2`
Session 2 - Arrays and Strings (UMPIRE)
===

## Highlights For This Session

* **Breakout session 1:** We will start with a breakout session for 5-10 minutes, with groups of 2-3, to warm up with an easy coding problem.
* **Introduce The Sliding-Window-Technique**: We will then introduce one of the common techniques to solve an array/string problem
* **Breakout session 2:** We will breakout for the second time where you will group into 2-3 to practice applying this technique on a new coding problem.

## Breakout session 1: (U-M-P-I-R-E)

The goal for this breakout session is to practice all aspects of the UMPIRE technique end-to-end, and implementing a solution.

Pick any one of the following problems to discuss in the breakout room.

### Problem 1:
Write a method to convert a string representation of an integer into its equivalent integer number.

For example:

Input: "123"
Output: 123

Input: "-6714"
Ouput: -6714

### Problem 2:
Write a method that takes an integer as input and returns its string representation.

For example:

Input: 123
Output: "123"

Input: -6714
Ouput: "-6714"

### Problem 3:
Reverse the ordering of words in a sentence.

**For example:**

Input: "The weather is amazing today!"
Output: "today! amazing is weather The"

## Breakout session 2: (I-R-E)

The goal for this breakout session is to practice implementing a solution for a problem, review and evaluate your code with a few test cases.

### Problem Statement
Given a string, find the length of the longest substring in it with no more than K distinct characters.

Example 1:

Input: String="araaci", K=2
Output: 4
#### Explanation: The longest substring with no more than '2' distinct characters is "araa".
Example 2:

Input: String="araaci", K=1
Output: 2
#### Explanation: The longest substring with no more than '1' distinct characters is "aa".
Example 3:

Input: String="cbbebi", K=3
Output: 5
#### Explanation: The longest substrings with no more than '3' distinct characters are "cbbeb" & "bbebi"