Pattern Printing – Till N & Reverse

Problem Statement

Write a program that accepts an integer N and prints a total of 2N lines, following the pattern shown in the examples below.

Input Format

The first line contains the integer N.

Output Format

Print the pattern in 2N lines as described.

Boundary Conditions

2 ≤ N ≤ 100

Example Input/Output

Example 1

Input:

4

Output:

1
22
333
4444
4444
333
22
1

Example 2

Input:

7

Output:

1
22
333
4444
55555
666666
7777777
7777777
666666
55555
4444
333
22
1

Python Implementation

n=int(input());p=[]
for i in range(1,n+1):
    l=[]
    for j in range(i):l.append(i)
    for i in l:print(i,end='')
    print();p.append(l)
for i in p[::-1]:
    for j in i:print(j,end='')
    print()

C Implementation

#include 
#include 

int main() {
    int n, a = 1, i, j;
    scanf("%d", &n);

    // Printing the upper pattern
    for (i = 0; i < n; i++) {
        for (j = 0; j <= i; j++)
            printf("%d", a);
        a++;
        printf("\n");
    }

    // Printing the reverse pattern
    for (i = 0; i < n; i++) {
        a--;
        for (j = 0; j < n - i; j++)
            printf("%d", a);
        printf("\n");
    }

    return 0;
}

Why Practice Pattern Printing?

Pattern printing exercises are crucial for understanding nested loops and logic-building in programming. Whether you use Python or C, practicing such problems will enhance your coding skills and logical thinking.

Conclusion

We hope this article helps you master the art of pattern printing. Try implementing the code examples provided, experiment with different values of N, and explore variations of the pattern. Happy coding!