Viewing other problems with insights similar to only this insight from Codeforces 913G: Power Substring:
Given this number n modulo 5^50, can you find r such that 2^r=n. This would solve the problem by Solarion
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Codeforces 1860B: Fancy Coins
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- Be careful not to use brute force. The constraints are less than 10^8. Consider using floor division and modulus instead. by Solarion
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