Need some test case for Double Burgers [BURGER]

Here is my submission. Can anybody please provide me a test case where my solution is wrong? It will be a great help. Thanks in advance.

4
2 100
1 100
4 100121
12 342
15
-1
-1
-1

Getting same answers(15, -1, -1, -1).

For sure precision error man , not able to give u test case but be careful in large numbers in case of log , floor and ceil

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