题解 | #字符个数统计#
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
const readline = require('readline'); const rl = readline.createInterface({ input: process.stdin, output: process.stdout }); let num = 0; rl.on('line', function (line) { let tokens:Array<string> = line.split(''); let str:string; while(tokens.length){ str = tokens.splice(0,1)[0]; if(!tokens.includes(str)){ num++ } } console.log(num) });