C Programming Language (Code With C Programming Language)

Problem Title: Binary Search?

When Jojo was a little kid, his teacher asked him a question. What was the answer of 1² + 2² + 3² + ... +N²? Of course that problem was hard enough for a primary student. But since he is a university student, and he knows that the answer is 1/6 * N * (N +1) * (2N +1), such problem is to easy for him. Now Jojo came up with a new problem. If he has an integer M, what is the smallest integer N such that 1² + 2² + 3² + ... +N² is Greater Than or Equal to M. After thinking for some time, he came up with a solution, but his solution takes a lot of time. Since you are his nemesis, he challenges you to solve the problem Quicker than him. Of course you accept his challenge!

Format Input

The first line is an integer T representing the number of test cases. For each test case there will be 1 line consisting of an integer M.

Format Output

For each test case output Case #X: N. X is the test case number and N is the smallest integer such that 1² + 2² + 3² + ... +N² is greater than or equal to M.

Constraints

• 1 T 2000
• 1 M 1000000000000000000

Sample Input & Output (Standard Input and Output)

2 2 Case #1: 2 10 Case #2: 3