Dsa Bit Missing Number

In this tutorial, you'll learn about How to Fix Missing Number Errors. We cover key concepts, practical examples, and best practices.

Fix missing number errors when XOR approach not used or sum overflow for large n.

Quick Fix

Wrong

def miss(n):
    return sum(range(len(n)+1))-sum(n)

Works but sum of range may overflow for large n in languages with fixed integers.

Right

def miss(n):
    res=len(n)
    for i,v in enumerate(n):
        res^=i^v
    return res

[3,0,1] -> 2. [0,1] -> 2. [9,6,4,2,3,5,7,0,1] -> 8. O(n) time, O(1) space.

Prevention

XOR index and value. res starts with n. For each i, v: res ^= i ^ v. Missing number remains.

DodaTech Tools

Doda Browser's algorithm visualizer steps through DSA operations line by line. DodaZIP archives implementation patterns for team sharing. Durga Antivirus Pro detects memory corruption patterns in algorithm implementations.

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