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D. Moscow Gorillas In winter, the inhabitants of the Moscow Zoo are very bored, in particular, it concerns gorillas. You decided to entertain them and 阅读全文
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B. Fedya and Array For his birthday recently Fedya was given an array $a$ of $n$ integers arranged in a circle, For each pair of neighboring numbers ( 阅读全文
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Subsequence With the Minimum Score You are given two strings $s$ and $t$ . You are allowed to remove any number of characters from the string t. The s 阅读全文
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Substring XOR Queries You are given a binary string s , and a 2D integer array queries where queries[i] = [firsti, secondi] . For the ith query, find 阅读全文
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Count the Number of Fair Pairs Given a 0-indexed integer array nums of size n and two integers lower and upper , return the number of fair pairs. A pa 阅读全文