Leftmost Column with At Least a One

Given a binary matrix where every row is sorted in non-decreasing order, return the index of the leftmost column that contains at least one 1, or -1 if no such column exists. Leftmost Column with At Least a One Given a binary matrix where every row is sorted in non-decreasing order, return the index of the leftmost column that contains at least one 1, or -1 if no such column exists. SWE grid binary-search two-pointer medium Frequency Single report Last asked 2026-06-04 Stage phone-screen Leftmost Column with At Least a One You are given a binary matrix binaryMatrix, where every row is sorted in non-decreasing order. Return the index of the leftmost column containing at least one 1, or -1 if no such column exists. Examples Example 1: Input: binaryMatrix = [[0,0],[1,1]] Output: 0 Example 2: Input: binaryMatrix = [[0,0],[0,0]] Output: -1 Constraints 1 <= binaryMatrix.length, binaryMatrix[i].length <= 100 Each row is sorted in non-decreasing order.