easyNeetCode 150
Single Number
Every element appears twice except one. Find the single one. Use O(1) extra space Example: [2,2,1] => 1
XOR cancels equal pairs and keeps the odd one out. One pass over the array, no extra space.
Meet Coco
Coco is an AI study partner, not a person. She listens while you explain your code, asks what a line does and never hands you the fix. Sign in free to type with Coco, up to a daily limit, and to talk with her for one hour. After that, talking comes with the $79 pack. Anyone can open the editor and run their code.
1Single Numbereasy
Based onLeetCode