var num = new Array(10000).fill('').map((item,index) => (index + 1)). 在点号后面补充代码,让num是这个数组中0出现的次数,100算出现了2次0 var num = new Array(10000).fill('').map((item,index) => (index + 1)).reduce((pre,current) => { return pre + (function(current) { // 方法一 //…
POJ 3286 How many 0's?(几多0?) Time Limit: 1000MS Memory Limit: 65536K [Description] [题目描述] A Benedict monk No.16 writes down the decimal representations of all natural numbers between and including m and n, m ≤ n. How many 0's will he write down? 一个…