Merge pull request #166 from ashwek/CountingSort

Create Counting_Sort.cpp

Sorting/Counting_Sort.cpp

@@ -0,0 +1,55 @@
+#include<iostream>
+using namespace std;
+
+int Max(int Arr[], int N){
+	int max = Arr[0];
+	for(int i=1; i<N; i++)
+		if(Arr[i] > max)
+			max = Arr[i];
+	return max;
+}
+
+int Min(int Arr[], int N){
+	int min = Arr[0];
+	for(int i=1; i<N; i++)
+		if(Arr[i] < min)
+			min = Arr[i];
+	return min;
+}
+
+void Print(int Arr[], int N){
+	for(int i=0; i<N; i++) cout<<Arr[i] <<", ";
+}
+
+int *Counting_Sort(int Arr[], int N){
+
+	int max = Max(Arr, N);
+	int min = Min(Arr, N);
+	int *Sorted_Arr = new int[N];
+	
+	int *Count = new int[max-min+1];
+	
+	for(int i=0; i<N; i++) Count[Arr[i]-min]++;
+  
+	for(int i=1; i<(max-min+1); i++) Count[i]+=Count[i-1];
+	
+	for(int i=N-1; i>=0; i--){
+		Sorted_Arr[Count[Arr[i]-min]-1] = Arr[i];
+		Count[Arr[i]-min]--;
+	}
+	
+	return Sorted_Arr;
+}
+
+int main(){
+
+	int Arr[] = {47, 65, 20, 66, 25, 53, 64, 69, 72, 22, 74, 25, 53, 15, 42, 36, 4, 69, 86, 19}, N = 20;
+	int *Sorted_Arr;
+	
+	cout<<"\n\tOrignal Array = ";Print(Arr, N);
+	Sorted_Arr = Counting_Sort(Arr, N);
+	cout<<"\n\t Sorted Array = ";Print(Sorted_Arr, N);
+	cout<<endl;
+	
+	return 0;
+}