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Author: assassint2017

Search a 2D Matrix II/Search_a_2D_Matrix_II.cpp

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+// 剑指offer上的题目
+// Runtime: 60 ms, faster than 94.48% of C++ online submissions for Search a 2D Matrix II.
+// Memory Usage: 12.8 MB, less than 91.11% of C++ online submissions for Search a 2D Matrix II.
+
+class Solution 
+{
+public:
+    bool searchMatrix(vector<vector<int>>& matrix, int target) 
+    {
+        int row = matrix.size();
+        if (row == 0) return false;
+
+        int col = matrix[0].size();
+        if (col == 0) return false;
+
+        int rowIndex = 0, colIndex = col - 1;
+
+        while (colIndex >= 0 && rowIndex < row)
+        {
+            if (matrix[rowIndex][colIndex] > target)
+            {
+                --colIndex;
+            }
+            else if (matrix[rowIndex][colIndex] < target)
+            {
+                ++rowIndex;
+            }
+            else
+            {
+                return true;
+            }
+        }
+
+        return false;
+    }
+};