[LeetCode] 1198. Find Smallest Common Element in All Rows
Given an m x n matrix mat where every row is sorted in strictly increasing order, return the smallest common element in all rows ...
原文：【leetcode&CN&競賽】1198.Find Smallest Common Element in All Rows
題目如下： 給你一個矩陣mat，其中每一行的元素都已經按遞增順序排好了。請你幫忙找出在所有這些行中最小的公共元素。 如果矩陣中沒有這樣的公共元素，就請返回 。 示例： 提示： lt mat.length, mat i .length lt lt mat i j lt mat i 已按遞增順序排列。 解題思路：我最初的想法遍歷整個矩陣，記錄每一個值出現的個數，如果某個值出現的次數恰好等於矩陣的行數， ...
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