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排队 $n$ 个小朋友排成一排，从左到右依次编号为 $1 \sim n$。 第 $i$ 个小朋友的身高为 $h_i$。 虽然队伍已经排好，但是小朋友们对此并不完全满意。 对于一个小朋友来说，如果存在其他小朋友身高比他更矮，却站在他右侧的情况，该小朋友就会感到不满。 每个小朋友的不满程度都可以量化计算 阅读全文
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E. Hanging Hearts Pak Chanek has $n$ blank heart-shaped cards. Card $1$ is attached directly to the wall while each of the other cards is hanging onto 阅读全文
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D. Count GCD You are given two integers $n$ and $m$ and an array $a$ of $n$ integers. For each $1 \le i \le n$ it holds that $1 \le a_i \le m$. Your t 阅读全文
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D. Knowledge Cards Pak Chanek, a renowned scholar, invented a card puzzle using his knowledge. In the puzzle, you are given a board with $n$ rows and 阅读全文
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E. Cactus Wall Monocarp is playing Minecraft and wants to build a wall of cacti. He wants to build it on a field of sand of the size of $n \times m$ c 阅读全文
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D. ConstructOR You are given three integers $a$, $b$, and $d$. Your task is to find any integer $x$ which satisfies all of the following conditions, o 阅读全文
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区间最大公约数 给定一个长度为 $N$ 的数列 $A$，以及 $M$ 条指令，每条指令可能是以下两种之一： C l r d ，表示把 $A[l],A[l+1], \ldots ,A[r]$ 都加上 $d$。 Q l r ，表示询问 $A[l],A[l+1], \ldots ,A[r]$ 的最大公约数 阅读全文
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B. Diverse Substrings A non-empty digit string is diverse if the number of occurrences of each character in it doesn't exceed the number of distinct c 阅读全文
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Maximum Number of Non-overlapping Palindrome Substrings You are given a string s and a positive integer k . Select a set of non-overlapping substrings 阅读全文
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Minimum Number of Operations to Sort a Binary Tree by Level You are given the root of a binary tree with unique values. In one operation, you can choo 阅读全文