Add solution 556

Author: vulgur

556_ReshapeTheMatrix.swift

@@ -0,0 +1,14 @@
+class Solution {
+    func matrixReshape(_ nums: [[Int]], _ r: Int, _ c: Int) -> [[Int]] {
+        let numbers = nums.reduce([], +)
+        if numbers.count != r*c {
+            return nums
+        }
+
+        var reshaped = Array(repeating:[Int](), count:r)
+        for count in 0..<numbers.count {
+            reshaped[count/c].append(numbers[count])
+        }
+        return reshaped
+    }
+}