Grokking the Coding Interview: Patterns for Coding Questions
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Solution: Conflicting Appointments
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Problem Statement

Given an array of intervals representing ‘N’ appointments, find out if a person can attend all the appointments.

Example 1:

Intervals: [[1,4], [2,5], [7,9]]
Output: false
Explanation: Since [1,4] and [2,5] overlap, a person cannot attend both of these appointments.

Example 2:

Intervals: [[6,7], [2,4], [13, 14], [8,12], [45, 47]]
Output: true
Explanation: None of the appointments overlap, therefore a person can attend all of them.

Example 3:

Intervals: [[4,5], [2,3], [3,6]]
Output: false

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