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 map = new Map();
for(let i = 0; i < line.length; i++){
let c = line.charAt(i);
if(map.get(c)){
map.set(c, map.get(c)+1);
}else{
map.set(c, 1);
}
}
let flag = true; // 用于判断是否存在只出现一次的字符
for(const [k, v] of map){
if(v === 1){
flag = false;
console.log(k);
break;
}
}
if(flag){
console.log(-1);
}
}
}()
