Cut and Count

AtCoder

IDabc098_b

Time2000ms

Memory256MB

Difficulty—

You are given a string $S$ of length $N$ consisting of lowercase English letters. We will cut this string at one position into two strings $X$ and $Y$. Here, we would like to maximize the number of different letters contained in both $X$ and $Y$. Find the largest possible number of different letters contained in both $X$ and $Y$ when we cut the string at the optimal position. ## Constraints * $2 \leq N \leq 100$ * $|S| = N$ * $S$ consists of lowercase English letters. ## Input Input is given from Standard Input in the following format: $N$ $S$ [samples]

Samples

Input #1

6
aabbca

Output #1

2

If we cut the string between the third and fourth letters into $X =$ `aab` and $Y =$ `bca`, the letters contained in both $X$ and $Y$ are `a` and `b`. There will never be three or more different letters contained in both $X$ and $Y$, so the answer is $2$.

Input #2

10
aaaaaaaaaa

Output #2

1

However we divide $S$, only `a` will be contained in both $X$ and $Y$.

Input #3

45
tgxgdqkyjzhyputjjtllptdfxocrylqfqjynmfbfucbir

Output #3

API Response (JSON)

{
  "problem": {
    "name": "Cut and Count",
    "description": {
      "content": "You are given a string $S$ of length $N$ consisting of lowercase English letters. We will cut this string at one position into two strings $X$ and $Y$. Here, we would like to maximize the number of di",
      "description_type": "Markdown"
    },
    "platform": "AtCoder",
    "limit": {
      "time_limit": 2000,
      "memory_limit": 262144
    },
    "difficulty": "None",
    "is_remote": true,
    "is_sync": true,
    "sync_url": null,
    "sign": "abc098_b"
  },
  "statements": [
    {
      "statement_type": "Markdown",
      "content": "You are given a string $S$ of length $N$ consisting of lowercase English letters. We will cut this string at one position into two strings $X$ and $Y$. Here, we would like to maximize the number of di...",
      "is_translate": false,
      "language": "English"
    }
  ]
}

Full JSON Raw Segments