1        1
12      21
123    321
1234  4321
1234554321

#include<stdio.h>

int main()
{
  int i,j,k;
  for(i=1;i<=5;i++)
  {
    for(j=1;j<=5;j++)
    {
      if(j<=i)
        printf("%d",j);
      else
        printf(" ");
    }
    for(j=5;j>=1;j--)
    {
      if(j<=i)
        printf("%d",j);
      else
        printf(" ");
    } 
    printf("\n");
  }
  return 0;
}

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