update

Author: jasoncao11

P112. 搜索二维矩阵.md

@@ -0,0 +1,24 @@
+![algo48](./images/algo48.jpg)
+
+```
+class Solution(object):
+    def searchMatrix(self, matrix, target):
+        """
+        :type matrix: List[List[int]]
+        :type target: int
+        :rtype: bool
+        """
+
+        row = len(matrix)-1
+        col = 0
+        start = matrix[row][col]
+
+        while (row>=0 and col < len(matrix[0])):
+            if matrix[row][col] < target:
+                col += 1
+            elif matrix[row][col] > target:
+                row -= 1
+            else:
+                return True
+        return False
+```