Minor Change

AtCoder

IDabc172_b

Time2000ms

Memory256MB

Difficulty—

Given are strings $S$ and $T$. Consider changing $S$ to $T$ by repeating the operation below. Find the minimum number of operations required to do so. Operation: Choose one character of $S$ and replace it with a different character. ## Constraints * $S$ and $T$ have lengths between $1$ and $2\times 10^5$ (inclusive). * $S$ and $T$ consists of lowercase English letters. * $S$ and $T$ have equal lengths. ## Input Input is given from Standard Input in the following format: $S$ $T$ [samples]

Samples

Input #1

cupofcoffee
cupofhottea

Output #1

4

We can achieve the objective in four operations, such as the following:

*   First, replace the sixth character `c` with `h`.
*   Second, replace the eighth character `f` with `t`.
*   Third, replace the ninth character `f` with `t`.
*   Fourth, replace the eleventh character `e` with `a`.

Input #2

abcde
bcdea

Output #2

Input #3

apple
apple

Output #3

0

No operations may be needed to achieve the objective.

API Response (JSON)

{
  "problem": {
    "name": "Minor Change",
    "description": {
      "content": "Given are strings $S$ and $T$. Consider changing $S$ to $T$ by repeating the operation below. Find the minimum number of operations required to do so. Operation: Choose one character of $S$ and replac",
      "description_type": "Markdown"
    },
    "platform": "AtCoder",
    "limit": {
      "time_limit": 2000,
      "memory_limit": 262144
    },
    "difficulty": "None",
    "is_remote": true,
    "is_sync": true,
    "sync_url": null,
    "sign": "abc172_b"
  },
  "statements": [
    {
      "statement_type": "Markdown",
      "content": "Given are strings $S$ and $T$. Consider changing $S$ to $T$ by repeating the operation below. Find the minimum number of operations required to do so.\nOperation: Choose one character of $S$ and replac...",
      "is_translate": false,
      "language": "English"
    }
  ]
}

Full JSON Raw Segments