Permutation Check

AtCoder

IDabc205_b

Time2000ms

Memory256MB

Difficulty—

You are given a sequence of $N$ integers between $1$ and $N$ (inclusive): $A = (A_1, A_2, \dots, A_N)$. Determine whether $A$ is a permutation of $(1, 2, \dots, N)$. ## Constraints * $1 \leq N \leq 10^3$ * $1 \leq A_i \leq N$ * All values in input are integers. ## Input Input is given from Standard Input in the following format: $N$ $A_1$ $A_2$ $\ldots$ $A_N$ [samples]

Samples

Input #1

5
3 1 2 4 5

Output #1

Yes

$(3, 1, 2, 4, 5)$ is a permutation of $(1, 2, 3, 4, 5)$, so we should print `Yes`.

Input #2

6
3 1 4 1 5 2

Output #2

No

$(3, 1, 4, 1, 5, 2)$ is not a permutation of $(1, 2, 3, 4, 5, 6)$, so we should print `No`.

Input #3

3
1 2 3

Output #3

Yes

Input #4

1
1

Output #4

Yes

API Response (JSON)

{
  "problem": {
    "name": "Permutation Check",
    "description": {
      "content": "You are given a sequence of $N$ integers between $1$ and $N$ (inclusive): $A = (A_1, A_2, \\dots, A_N)$. Determine whether $A$ is a permutation of $(1, 2, \\dots, N)$.",
      "description_type": "Markdown"
    },
    "platform": "AtCoder",
    "limit": {
      "time_limit": 2000,
      "memory_limit": 262144
    },
    "difficulty": "None",
    "is_remote": true,
    "is_sync": true,
    "sync_url": null,
    "sign": "abc205_b"
  },
  "statements": [
    {
      "statement_type": "Markdown",
      "content": "You are given a sequence of $N$ integers between $1$ and $N$ (inclusive): $A = (A_1, A_2, \\dots, A_N)$.\nDetermine whether $A$ is a permutation of $(1, 2, \\dots, N)$.\n\n## Constraints\n\n*   $1 \\leq N \\le...",
      "is_translate": false,
      "language": "English"
    }
  ]
}

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