题解 | #找出字符串中第一个只出现一次的字符#
找出字符串中第一个只出现一次的字符
https://www.nowcoder.com/practice/e896d0f82f1246a3aa7b232ce38029d4
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 tokens = line.split(' '); // let a = parseInt(tokens[0]); // let b = parseInt(tokens[1]); // console.log(a + b); let countMap = {}; for (let i = 0; i < line.length; i++) { const item = line[i]; if (!countMap.hasOwnProperty(item)) { countMap[item] = [i]; } else { countMap[item].push(i); } } let min=Infinity for(let i in countMap){ if(countMap[i].length==1){ // console.log(countMap[i]) min=Math.min(min,countMap[i][0]) } } let res=(min==Infinity)?-1:line[min] console.log(res) } })();