swap: interchange v[i] and v[j]

void swap(int v[], int i, int j){
     int temp;
     
      temp = v[i];
      v[i] = v[j];
      v[j] = temp;
}
/*swap: without temp */
void swap(int v[], int i , int j){
   v[i] ^= v[j];
   v[j] ^= v[i];
   v[i] ^= v[j];
}