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#include<stdio.h>
int main() {
int i, j, k, l;
for(i=1; i<=5; i++) {
/* Print blank space */
for(j=i; j<=5; j++)
printf(" ");
/* construct left side of the pyramid */
for(k=1; k<=i; k++)
printf("%d",k);
/* Construct right side of the pyramid */
for(l=i-1; l>=1; l--)
printf("%d",l);
printf("\n");
}
return 0;
}
/* Output */
1
121
12321
1234321
123454321