题解 | #MP3光标位置#
MP3光标位置
https://www.nowcoder.com/practice/eaf5b886bd6645dd9cfb5406f3753e15
const readline = require('readline') const rl = readline.createInterface({ input: process.stdin, output: process.stdout }) function test(n,str){ const arr = new Array(n).fill(0) let start = 0,end = n % 4 - 1,cur = 0 for(const item of str){ if(item === 'U'){ if(cur === 0){ cur = arr.length-1 if(n < 4){ start = 0 end = n-1 }else{ start = cur - 3 end = cur } }else{ cur-- if(Math.abs(cur - end) > 3){ start = cur end = cur + 3 } } }else{ if(cur === arr.length-1){ cur = 0 start = 0 end = 3 }else{ cur++ if(Math.abs(cur - start) > 3){ end = cur start = end - 3 } } } } let res = [] for(let i=start+1;i<=end+1;i++){ res.push(i) } console.log(res.join(' ')) console.log(++cur) } const arr = [] rl.on('line',function(line){ arr.push(line) }) rl.on('close',function(){ test(+arr[0],arr[1]) })