Valid Sudoku Explained in 10 Minutes | NeetCode 150

This video explains Valid Sudoku from the NeetCode 150 Arrays & Hashing section in about 10 minutes. We validate the board by tracking the numbers already seen in every row, column, and 3×3 box. The key idea is using hash sets and mapping each cell to its box with (row // 3, col // 3). I’m working through the NeetCode 150 as an average CS student and explaining each problem while I learn the patterns behind it. Watch the full series: NeetCode 150 From Scratch Topics covered: Valid Sudoku LeetCode 36 Rows and columns 3×3 boxes Hash sets Arrays and hashing #leetcode #neetcode150 #codinginterview