#include <stdio.h>
int main(){
for (int i = 1;i<n;i++) {
    int key=arr[i];
    int j = i -1;
while (j>=0&&arr[j]>key) {
    arr[j+1]=arr[j];//arr[1]=12
    j-;//-1
   }
   arr[j+1]=key;//a[0]=11;
   return 0;
    
}