题解 | #等差数列#
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
function getDcNumList(str){
// 字符串自动会隐式转换成数字
const num = str * 1
let sum = 0
let i , j
for(i = 0, j = 2; i < num; i++,j += 3){
sum += j
}
return sum
}
console.log(getDcNumList(readline()))
// 字符串自动会隐式转换成数字
const num = str * 1
let sum = 0
let i , j
for(i = 0, j = 2; i < num; i++,j += 3){
sum += j
}
return sum
}
console.log(getDcNumList(readline()))
