Working with Android layouts, asynchronous communication, java libraries, REST API client architecture.

One logical task: you have an array of 99 distinct integers, each one can have a value between 1 and 100 inclusively. But no duplicates in an array. Array is not sorted. Find out which value is missing in the array.

Question

Working with Android layouts, asynchronous communication, java libraries, REST API client architecture. 

One logical task: you have an array of 99 distinct integers, each one can have a value between 1 and 100 inclusively. But no duplicates in an array. Array is not sorted. Find out which value is missing in the array.

Saddam Hussain · Accepted Answer

We know the sum of 100 numbers from 1, so we can add all the elements of the array and subtract it with the sum of 100 numbers which can be calculated with some mathematical formula.

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