题解 | #等差数列#
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;
void async function () {
// Write your code here
while(line = await readline()){
let n = Number(line);
let a1 = 2,d=3;
let result = n*(n-1)*d/2 + n*a1;//等差数列前n项的和
console.log(result);
}
}()
，可以适当对关键信息加粗一点，比如关键技术、性能指标之类的。
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