Want to ask the way many sort of faster code, fill in the blanks in the answer to why is k - (I

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Want to ask the way many sort of faster code, fill in the blanks in the answer to why is k - (I - 1

Time：10-11

Fills up the topic from the blue cup 2018

CodePudding user response:

Hair in good condition to understand, I can't see the first number k