题解 | #序列找数# 攒人品
序列找数
https://www.nowcoder.com/practice/a7d1856a72404ea69fdfb5786d65539c
// const readline=require("readline") // const rl=readline.createInterface({ // input:process.stdin, // output:process.stdout // }) // const arr=[] // let max // rl.on("line",function(line){ // arr.push(parseInt(line)) // max=arr[0] // }) const readline = require("readline"); const rl = readline.createInterface({ input: process.stdin, output: process.stdout, }); let arr let max rl.on("line", function(line) { arr=line.split(" ") arr=arr.map((item)=>parseInt(item)) max=arr[0] }); rl.on("close",function(){ const sum=(max/2)*(max+1) arr.shift() const sum1=arr.reduce((a,b)=>a+b) console.log(sum-sum1) })