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chazhao
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pangzhiqiang committed Oct 25, 2020
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51 changes: 51 additions & 0 deletions controller/algorithm/er-wei-shu-zu-zhong-de-cha-zhao-lcof.go
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package algorithm

/*
原题:https://leetcode-cn.com/problems/er-wei-shu-zu-zhong-de-cha-zhao-lcof/
剑指 Offer 04. 二维数组中的查找
在一个 n * m 的二维数组中,每一行都按照从左到右递增的顺序排序,每一列都按照从上到下递增的顺序排序。请完成一个函数,输入这样的一个二维数组和一个整数,判断数组中是否含有该整数。
示例:
现有矩阵 matrix 如下:
[
[1, 4, 7, 11, 15],
[2, 5, 8, 12, 19],
[3, 6, 9, 16, 22],
[10, 13, 14, 17, 24],
[18, 21, 23, 26, 30]
]
给定 target = 5,返回 true。
给定 target = 20,返回 false。
限制:
0 <= n <= 1000
0 <= m <= 1000
*/

func findNumberIn2DArray(matrix [][]int, target int) bool {
length := len(matrix)
if length == 0 {
return false
}
row := length - 1
col := 0
for row >= 0 && col < len(matrix[0]) {
if matrix[row][col] == target {
return true
} else if matrix[row][col] > target {
row--
} else {
col++
}
}
return false
}

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