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Module DEMO-32-106DEMO-C-32

Find Missing Number

DEMO-C-32 • Programming in C

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Problem Statement

Given an array containing n-1 distinct numbers taken from the range 1 to n, find the missing number. Input the value of n (the range limit, making the array size n-1) and then the array elements.

Example

Input:

5 1 2 4 5

Output:

3

Constraints

n <= 100

Input Format

n and n-1 integers

Output Format

Missing number

Sample Testcases

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Sample #1
Public sample
Input
5
1 2 4 5
Output
3
Explanation
Sum 1..5 = 15. Array sum=12. Missing 3.
Sample #2
Public sample
Input
3
2 3
Output
1
Explanation
Missing 1.

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