Alyona and a tree time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Alyona has a tree with n vertices. The root of the tree is the vertex 1. In each vertex Alyona wrote an positive integer,…
Power Strings Time Limit: 3000 MS Memory Limit: 65536 KB 64-bit integer IO format: %I64d , %I64u Java class name: Main [Submit] [Status] [Discuss] Description Given two strings a and b we define a*b to be their concatenation. For example, if a = "abc…
Color the ball Time Limit: 9000/3000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 21453 Accepted Submission(s): 10399 Problem Description N个气球排成一排,从左到右依次编号为1,2,3-.N.每次给定2个整数a b(a <= b),lele便为骑上他的"小飞鸽"牌电动车从气球…
一.前言 如何判断一个对象或一个值是否是一个数组,在面试或工作中我们常常会遇到这个问题,既然出现频率高,想着还是做个整理,那么本文主要基于几种判断方式,以及方式判断的原理,是否存在问题展开讨论. 二.判断对象是否是数组的几种方式 1.通过instanceof判断 instanceof运算符用于检验构造函数的prototype属性是否出现在对象的原型链中的任何位置,返回一个布尔值. let a = []; a instanceof Array; //true let b = {}; b insta…
C. New Year and Domino They say "years are like dominoes, tumbling one after the other". But would a year fit into a grid? I don't think so. Limak is a little polar bear who loves to play. He has recently got a rectangular grid with h rows and…
一整数(有正有负)数组,用尽量少的时间计算数组中和为某个整数的所有子数组 public class SumK { public static void main(String[] args) { int[] array = {4,5,2,4,7,1,8,-3,6,3,2,6,1,4,-6,7,-4,2,-1,8,5,2,7,4,3}; int k = 11; Map<Integer,Integer> set = new HashMap<Integer,Integer>(); int…
