CPP

insertion sort c++

// C++ program for insertion sort
#include <bits/stdc++.h>
using namespace std;
 
/* Function to sort an array using insertion sort*/
void insertionSort(int arr[], int n)
{
    int i, key, j;
    for (i = 1; i < n; i++)
    {
        key = arr[i];
        j = i - 1;
 
        /* Move elements of arr[0..i-1], that are
        greater than key, to one position ahead
        of their current position */
        while (j >= 0 && arr[j] > key)
        {
            arr[j + 1] = arr[j];
            j = j - 1;
        }
        arr[j + 1] = key;
    }
}
 
// A utility function to print an array of size n
void printArray(int arr[], int n)
{
    int i;
    for (i = 0; i < n; i++)
        cout << arr[i] << " ";
    cout << endl;
}
 
/* Driver code */
int main()
{
    int arr[] = { 12, 11, 13, 5, 6 };
    int n = sizeof(arr) / sizeof(arr[0]);
 
    insertionSort(arr, n);
    printArray(arr, n);
 
    return 0;
}
 
// This is code is contributed by rathbhupendra

c++ code for insertion sort

#include<bits/stdc++.h>

using namespace std;

int main()
{
    //insertion sort
    int a[5] = {1,56,94,12,31};
    //if(n>1)
 int i,j;
 for(i=0;i<5-1;i++)
 {
     for(j=i+1;j>0;j--)
     {
         if(a[j]>=a[j-1])
         {
             break;
         }
         swap(a[j],a[j-1]);
     }
 }
 for(i=0;i<5;i++)
 {
     cout<<a[i]<<" ";
 }
 return 0;
}

insertion sort cpp

void insertionSort(int a[], int N) {
  for (int i = 1; i < N; ++i) { // O(N)
    int X = a[i]; // X is the item to be inserted
    int j = i-1;
    for (; j >= 0 && a[j] > X; --j) // can be fast or slow
      a[j+1] = a[j]; // make a place for X
    a[j+1] = X; // index j+1 is the insertion point
  }
}

// https://visualgo.net/en/sorting?slide=9-1
// [[29May2022]]