code incognito - INVENTON

general
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1

in the event CODE INCOGNITO there was a question of INVENTON, i compared many test cases from successful submission with my submission all outputs were same but still giving me a wrong answer

can any one help me to figure out where the testcases are failing and why , below is the link of my answer

https://www.codechef.com/viewsolution/20245447

2

how about

3
576460752303423487
576460752303423488
576460752303423489

should give

59
60
60
3

@joffan can you explain why is the approach “log2(n) + 1” not giving correct answer?

4

can you please help me to figure out why the expected result is not coming in the 1st one

5

You probably don’t have enough precision on log2() to distinguish nearly-59 from 59. Which is why I chose this example.

6

Precision on the log result. There can be 18 digits in the source number and you probably aren’t getting that many signficant figures for the log.