Practice Real Company Assessment Patterns • Latest 2025–2026 Mock Tests

Programming Exercises

Find the missing number in an array from 1 to n.

Medium

Problem Statement

Find the missing number in an array from 1 to n.

Sample Input

[1, 2, 4, 5], n = 5

Sample Output

3

Limits

Time: 2s · Memory: 256 MB

Code Editor
00:00
import java.util.*; public class Main { public static int findMissingNumber() { int[] arr = {1, 2, 4, 5}; int n = 5; // Your code here return 0; } }
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Input
[1, 2, 4, 5], n = 5
Expected Output
3