onlyblues

摘要： D. Many Perfect Squares You are given a set $a_1, a_2, \ldots, a_n$ of distinct positive integers. We define the squareness of an integer $x$ as the n 阅读全文

摘要： C. Equal Frequencies Let's call a string balanced if all characters that are present in it appear the same number of times. For example, "coder", "app 阅读全文

摘要： Difference Between Maximum and Minimum Price Sum There exists an undirected and initially unrooted tree with $n$ nodes indexed from $0$ to $n - 1$. Yo 阅读全文

摘要： D. Friendly Spiders Mars is home to an unusual species of spiders — Binary spiders. Right now, Martian scientists are observing a colony of $n$ spider 阅读全文

摘要： C. Interesting Sequence Petya and his friend, robot Petya++, like to solve exciting math problems. One day Petya++ came up with the numbers $n$ and $x 阅读全文

摘要： 最大价值 已知，小写字母 $a \sim z$ 的价值分别为 $w_a,w_b, \ldots, w_z$。 对于一个由小写字母构成的长度为 $l$ 的字符串 $S=s_{1} s_{2} \ldots s_{l}$，其价值为 $w_{s1} \times 1 + w_{s2} \times 2 + 阅读全文

摘要： B. Gardener and the Array The gardener Kazimir Kazimirovich has an array of $n$ integers $c_1, c_2, \dots, c_n$. He wants to check if there are two di 阅读全文

摘要： 等差数列 给定一个长度为 $n$ 的正整数数列 $a_1,a_2, \ldots, a_n$ 和一个正整数 $k$。 你可以对数列进行以下两种操作： + i x ，增加操作，将 $a_i$ 的值增加 $x$（$x \geq 1$）。- i x ，减少操作，将 $a_i$ 的值减少 $x$（$x \g 阅读全文

摘要： Maximize the Minimum Powered City You are given a 0-indexed integer array stations of length $n$, where stations[i] represents the number of power sta 阅读全文

摘要： Number of Great Partitions You are given an array nums consisting of positive integers and an integer k . Partition the array into two ordered groups  阅读全文