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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
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找数字 给定一个正整数 $m$ 和一个非负整数 $s$。 请你找到长度为 $m$ 且各位数字之和为 $s$ 的最小和最大非负整数。 要求所求非负整数不得包含前导零。 输入格式 共一行，两个整数 $m,s$。 输出格式 在一行内输出满足条件的最小和最大非负整数。 如果无解，则输出 -1 -1。 数据范 阅读全文
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B. Jumbo Extra Cheese 2 Pak Chanek has $n$ two-dimensional slices of cheese. The $i$-th slice of cheese can be represented as a rectangle of dimension 阅读全文
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D. Moving Dots We play a game with $n$ dots on a number line. The initial coordinate of the $i$-th dot is $x_i$. These coordinates are distinct. Every 阅读全文
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B. Sum of Two Numbers The sum of digits of a non-negative integer $a$ is the result of summing up its digits together when written in the decimal syst 阅读全文
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E. Sum Over Zero You are given an array $a_1, a_2, \ldots, a_n$ of $n$ integers. Consider $S$ as a set of segments satisfying the following conditions 阅读全文
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D. Lucky Permutation You are given a permutation$^\dagger$ $p$ of length $n$. In one operation, you can choose two indices $1 \le i < j \le n$ and swa 阅读全文