Adding 74. Search a 2D Matrix in Swift

Author: Mahim1997

swift/74-Search-a-2D-Matrix.swift

@@ -0,0 +1,26 @@
+class Solution {
+    func searchMatrix(_ matrix: [[Int]], _ target: Int) -> Bool {
+        let ROWS = matrix.count
+        let COLS = matrix[0].count
+        
+        var row = ROWS - 1
+        var col = 0
+        
+        while row >= 0 && col < COLS {
+            let number = matrix[row][col]
+            
+            if number == target {
+                return true
+            }
+            
+            if number > target {
+                row -= 1    // go up                
+            }
+            else {
+                col += 1    // go right                
+            }
+        }
+    
+        return false
+    }
+}