From 33e53306398bbd9d35ea20e08b4075f58ff2a377 Mon Sep 17 00:00:00 2001
From: Shashikala <shashikala1631@gmail.com>
Date: Thu, 1 Oct 2020 14:48:40 +0530
Subject: [PATCH] added matrix rotation algorithm

---
 HelloWorld/helloworld.cpp           | 16 ++++++++--------
 algorithms/Rotate_matrixby90deg.cpp | 27 +++++++++++++++++++++++++++
 2 files changed, 35 insertions(+), 8 deletions(-)
 create mode 100644 algorithms/Rotate_matrixby90deg.cpp

diff --git a/HelloWorld/helloworld.cpp b/HelloWorld/helloworld.cpp
index b759adf..707e4f5 100644
--- a/HelloWorld/helloworld.cpp
+++ b/HelloWorld/helloworld.cpp
@@ -1,8 +1,8 @@
-#include<stdio.h>
-#include<iostream>
-
-int main()
-{
-	printf("Hello World!");
-}
-
+#include<stdio.h>
+#include<iostream>
+
+int main()
+{
+	printf("Hello World!");
+}
+
diff --git a/algorithms/Rotate_matrixby90deg.cpp b/algorithms/Rotate_matrixby90deg.cpp
new file mode 100644
index 0000000..df91c90
--- /dev/null
+++ b/algorithms/Rotate_matrixby90deg.cpp
@@ -0,0 +1,27 @@
+//Rotate matrix by 90 degree
+#include<bits/stdc++.h>
+using namespace std;
+int main()
+{
+    int n;
+    cin>>n;
+    int i,j,matrix[n][n];
+    for(int i=0;i<n;i++)
+        for(int j=0l;j<n;j++)
+            cin>>matrix[i][j];
+        for(i=0;i<n;i++)
+            for(j=i+1;j<n;j++)
+                swap(matrix[i][j],matrix[j][i]);
+        int k;
+        for(k=0;k<n;k++)
+        {
+            i=0,j=n-1;
+            while(j>i)
+            {
+                swap(matrix[k][i],matrix[k][j]);
+                i++;
+                j--;
+            }
+        }
+    return 0;
+}