CodeChef - Python Practice Solution - Chairs Requirement

Problem:

• Chef's coding class is very famous in Chefland.
• This year X students joined his class and each student will require one chair to sit on. Chef already has Y chairs in his class. Determine the minimum number of new chairs the Chef must buy so that every student is able to get one chair to sit on.

Input Format:

• The first line contains a single integer T — the number of test cases. Then the test cases follow.
• The first and only line of each test case contains two integers X and Y — the number of students in the class and the number of chairs Chef already has.

Output Format:

• For each test case, output the minimum number of extra chairs Chef must buy so that every student gets one chair.

Constraints: 

• 1 ≤ T ≤ 1000
• 0 ≤ X, Y ≤ 100

Sample Input:

4
20 14
41 41
35 0
50 100

Sample Output:

6
0
35
0

Explanation:

• Test case 1: There are 20 students in the class and the Chef has 14 chairs already. Therefore Chef must buy 6 more chairs.
• Test case 2: There are 41 students in the class and Chef already has exactly 41 chairs. Therefore Chef does not need to buy any more chairs.
• Test case 3: There are 35 students in the class and Chef has no chairs initially. Therefore Chef must buy 35 chairs.

Solution:

for _ in range(int(input())):
    x, y = list(map(int,input().split()))
    
    if x > y:
        print(x-y)
    else:
        print(0)

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