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+---
+数组相关
+---
+
+[04. 二维数组中的查找](https://leetcode-cn.com/problems/er-wei-shu-zu-zhong-de-cha-zhao-lcof/)
+
+```java
+class Solution {
+
+    public boolean findNumberIn2DArray(int[][] matrix, int target) {
+        if (matrix == null || matrix.length == 0) {
+            return false;
+        }
+        int m = matrix.length, n = matrix[0].length;
+        int row = 0, col = n - 1;
+        while (row < m && col >= 0) {
+            if (matrix[row][col] > target) {
+                col--;
+            } else if (matrix[row][col] < target) {
+                row++;
+            } else {
+                return true;
+            }
+        }
+        return false;
+    }
+}
+```
+