Algorithm

Problem link- https://www.spoj.com/problems/CPTTRN1/

CPTTRN1 - Character Patterns (Act 1)

#basics

 

Using two characters: . (dot) and * (asterisk) print a chessboard-like pattern. The first character printed should be * (asterisk).

Input

You are given t < 100 - the number of test cases and for each of the test cases two positive integers: l - the number of lines and c - the number of columns in the pattern (l, c < 100).

Output

For each of the test cases output the requested pattern (please have a look at the example). Use one line break in between successive patterns.

Example

Input:
3
3 1
4 4
2 5

Output:
*
.
*

*.*.
.*.*
*.*.
.*.*

*.*.*
.*.*.

 

Code Examples

#1 Code Example with C Programming

Code - C Programming

#include<stdio.h>
int main()
{
    int t,i,j,x,y,z;
    scanf("%d",&t);
    for(i=1;i<=t;i++)
    {
        scanf("%d%d",&x,&y);
        for(j=1;j<=x;j++)
        {
            for(z=1;z<=y;z++)
            {
                if((j+z)%2==0)
                {
                printf("*");
                }
                else
                {
                printf(".");
                }
            }
            printf("\n");
        }
        printf("\n");
    }
    return 0;
}
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Input

x
–
+
cmd
3
3 1
4 4
2 5

Output

x
–
+
cmd
*
.
*
*.*.
.*.*
*.*.
.*.*
*.*.*
.*.*.

#2 Code Example with Python Programming

Code - Python Programming

def main():
    t = int(input())
    while t:
        m = list(input().split())
        l = int(m[0])
        c = int(m[1])
        pos = 0
        for j in range(l):
            for i in range(c):
                if pos % 2 == 0:
                    print ('*', end='')
                    pos += 1
                else:
                    print('.', end='')
                    pos += 1
            if c % 2 == 0:
                pos += 1
            print()
        t -= 1

if __name__ == '__main__':
    main()
Copy The Code & Try With Live Editor

Input

x
–
+
cmd
3
3 1
4 4
2 5

Output

x
–
+
cmd
*
.
*
*.*.
.*.*
*.*.
.*.*
*.*.*
.*.*.
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Demonstration

SPOJ Solution-Character Patterns (Act 1)-Solution in C, C++, Java, Python

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