Overall hint: Imagine all outputs as a matrix of space and star. Then count spaces and stars to find out the trend of increment or decrement of number of stars/spaces. Utilize several IF statement to control when star will be printed, when space will be printed and when enter will be printed. Nested loop may be utilized to print multiple lines.

PROBLEM 1) Number Line Sample input:

6

Sample output

123456

PROBLEM 2) Rectangle Sample input:

4

6

Sample output

123456

123456

123456

123456

Hint: 4 and 6 means 4 lines of numbers having 1..6 in each line.

PROBLEM 3) Triangle Left Justified Draw right angled triangle of given height Sample input:

4

Sample output

1

12

123

1234

Hint: One loop for lines, another loop for printing number 1 to i when it is line i.

PROBLEM 4) Triangle Right Justified Draw right angled triangle of given height Sample input:

4

Sample output

1

12

123

1234

PROBLEM 5) Triangle Isosceles Draw triangle of given height Sample input 1:

3

Sample output 1:

1

123

12345

Sample input 2:

4

Sample output 2:

1

123

12345

1234567

PROBLEM 6) Rhombus

Just draw the image of the above triangle once. And then, the opposite, once. Sample input:

3

Sample output

1

123

12345

123

1

PROBLEM 7) Hollow Rectangle

Display a rectangle of given length and width.

Sample input:

4

5

Sample output

12345

1 5

1 5

12345

Hint 1: Print the character space ( ) in the middle.

Hint 2: You can re-use your solution to PROBLEM 2) Rectangle and use IF condition to selectively print first and last star of each line and all stars of first and last line.

8) Hollow Triangle Left Justified Draw right angled triangle of given height Sample input: 5

Sample output

• 12 1 3 1 4

12345

PROBLEM 9) Hollow Triangle Right Justified Draw right angled triangle of given height Sample input: 5

Sample output

5

45

3 5

• 5

12345

PROBLEM 10) Hollow Triangle Isosceles Draw triangle of given height Sample input 1:

3

Sample output 1:

1 1 3

12345

Sample input 2:

4

Sample output 2:

1

1 3

1 5

1234567

11) Hollow Rhombus

Just draw the image of the above triangle once. And then, the opposite, once. Sample input: 3

Sample output

1

1 3

1 5

1 3

1

PROBLEM 12) Triangle Right Justified Draw right angled triangle of given height Sample input: 4

Sample output

4

34

234

1234

PROBLEM 13) Palindrome Sample input: 5

Sample output

123454321

PROBLEM 14) Palindromic Triangle Sample input: 5

Sample output

1

121

12321

1234321

123454321

PROBLEM 15) Star Line

Print as many stars as given in input Sample input: 6

Sample output

******

• Rectangle using solution of PROBLEM 15) Star Line Sample input:

4

6

Sample output

******

******

******

******

Hint: 4 and 6 means 4 lines of stars having 6 stars in each line.

• Triangle Left Justified Draw right angled triangle of given height Sample input:

4

Sample output

*

**

***

****

Hint: One loop for lines, another loop for printing i number of stars when it is line i.

PROBLEM 18) Triangle Right Justified Draw right angled triangle of given height Sample input:

4

Sample output

*

**

***

****

Hint: Count and print appropriate number of spaces in front of stars. Notice that there is one less space and one more star in each line.

PROBLEM 19) Triangle Isosceles Draw triangle of given height Sample input 1:

3

Sample output 1:

*

***

*****

Sample input 2:

4

Sample output 2:

*

***

*****

*******

PROBLEM 20) Rhombus using PROBLEM 19) Triangle Isosceles

Just draw the image of the above triangle once. And then, the opposite, once. Sample input:

3

Sample output

*

***

*****

***

*

21) Hollow Rectangle using solution of PROBLEM 16) Rectangle Display a rectangle of given length and width.

Sample input:

4

5

Sample output

*****

• *
• *

*****

Hint 1: Print the character space ( ) in the middle.

Hint 2: You can re-use your solution to PROBLEM 16 and use if condition to selectively print first and last star of each line and all stars of first and last line.

PROBLEM 22) Hollow Triangle Left Justified using solution of PROBLEM 17) Triangle Left Justified Draw right angled triangle of given height Sample input:

5

Sample output

*

**

• *
• *

*****

PROBLEM 23) Hollow Triangle Right Justified using solution of PROBLEM 18) Triangle Right Justified Draw right angled triangle of given height Sample input:

5

Sample output

*

**

• *
• *

*****

PROBLEM 24) Hollow Triangle Isosceles using solution of PROBLEM 19) Triangle Isosceles Draw triangle of given height Sample input 1:

3

Sample output 1:

*

• *

*****

Sample input 2:

4

Sample output 2:

*

• *
• *

*******

PROBLEM 25) Hollow Rhombus using solution of PROBLEM 20) Rhombus Just draw the image of the above triangle once. And then, the opposite, once. Sample input:

3

Sample output

*

• *
• *
• *

*

26. First 15 problems from URI Online Judge (See link below) :

https://www.urionlinejudge.com.br/judge/en/problems/index/1