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今日の問題

↑押してください。

自分の回答(javascript)

function Main(input){
    min = 1e18
    max = -1e18
    let abc = "abcdefghijklmnopqrstuvwxyz".split("")
    let ABC = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".split("")
    let f = 3
    if(f == 0){
      input = parseInt(input.trim())
    }
    if(f == 1){
      input = input.trim().split("\n").map((a)=>parseInt(a))
    }
    if(f == 2){
      input = input.trim().split("\n").map((a)=>a.split(" ").map((b)=>parseInt(b)))
    }
    //ここより上は定型文です。
    input = input.trim().split("\n")
    res = 1
   n = parseInt(input.shift())
   t = input.shift().split("/")
   mae = 0
   for(let i = 0;i<t.length;i++){
     ato = 0
     for(let j = 0;j<t[i].length;j++){
       if(t[i][j] == "2"){
         ato ++
       }else{
         break
       }
     }
     res = Math.max(res,Math.min(mae,ato)*2+1)
     mae = 0
     for(let j = t[i].length-1;j>=0;j--){
       if(t[i][j] == "1"){
         mae ++
       }else{
         break
       }
     }
     
   }
   console.log(res)
  }
  Main(require("fs").readFileSync(0, "utf8"));
  

工夫した点

"/"でsplitしてそれぞれの前と後での連続数の最大値を更新していきました。特に計算量の心配はありません。

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