added leetcode 566 (#193)

Author: gantavyamalviya

C++/Reshape-the-Matrix.cpp

@@ -0,0 +1,23 @@
+class Solution {
+public:
+    vector<vector<int>> matrixReshape(vector<vector<int>>& mat, int r, int c) {
+        if(mat.size()*mat[0].size() != r*c) return mat;
+        vector<int> v;
+        for(int i=0;i<mat.size();i++){
+            for(int j=0;j<mat[0].size();j++){
+                v.push_back(mat[i][j]);
+            }
+        }
+        int k=0;
+        vector<vector<int>> vnew;
+        vector<int> input;
+        for(int i=0;i<r;i++){
+            for(int j=0;j<c;j++){
+                input.push_back(v[k++]);
+            }
+            vnew.push_back(input);
+            input.clear();
+        }
+        return vnew;
+    }
+};