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摘要： 2024.12.20 周五 Q1. 1000 Ethan runs a vaccination station to help people combat the seasonal flu. He analyses the historical data in order to develop an 阅读全文

摘要： 2024.12.19 周四 Q1. 1000 Consider a $2 \times n$ grid, where $n$ is an even integer. You may place the integers $1, 2, \ldots, 2n$ on the grid, using ea 阅读全文

摘要： 2024.12.18 周三 Q1. 1000 You have an array of zeros $a_1, a_2, \ldots, a_n$ of length $n$. You can perform two types of operations on it: Choose an inde 阅读全文

摘要： 2024.12.17 周二 Q1. 1000 Jonathan is fighting against minions. There are $n$ of them with strengths $a_1, a_2, \dots, a_n$. Denote $(l, r)$ as the group 阅读全文

摘要： 2024.12.16 周一 Q1. 1000 Monocarp is playing yet another computer game. And yet again, his character is killing some monsters. There are $n$ monsters, n 阅读全文

摘要： Codeforces Round 993 (Div. 4) 2024.12.15 rank289 +123：1381->1504 A Cube is given an integer $n$. She wants to know how many ordered pairs of positive 阅读全文

摘要： 2024.12.14 周六 Q1. 1000 You are given two strings $a$ and $b$ of equal length, consisting of only characters 0 and/or 1; both strings start with charac 阅读全文

摘要： 2024.12.13 周五 Q1. 1000 Polycarp has a problem — his laptop keyboard is broken. Now, when he presses the 'b' key, it acts like an unusual backspace: it 阅读全文

摘要： 2024.12.12 周四 Q1. 1000 You have an array $a$ of $n$ integers. You can no more than once apply the following operation: select three integers $i$, $j$, 阅读全文

摘要： 2024.12.11 周三 Q1. 1100 给定一长度为 $n$ 的数组，你需要执行 $k$ 次操作：每次选择一连续子数组(可为空)，将和作为一元素放到到数组的任意位置。问最后数组和的最大值。 Q2. 1100 给你一长度为$2n$的数组$a$，$1$~$n$各出现2次。让你找出两个大小为$2k$ 阅读全文