GeT AC

AtCoder

IDabc122_c

Time2000ms

Memory256MB

Difficulty—

You are given a string $S$ of length $N$ consisting of `A`, `C`, `G` and `T`. Answer the following $Q$ queries: * Query $i$ ($1 \leq i \leq Q$): You will be given integers $l_i$ and $r_i$ ($1 \leq l_i < r_i \leq N$). Consider the substring of $S$ starting at index $l_i$ and ending at index $r_i$ (both inclusive). In this string, how many times does `AC` occurs as a substring? ## Constraints * $2 \leq N \leq 10^5$ * $1 \leq Q \leq 10^5$ * $S$ is a string of length $N$. * Each character in $S$ is `A`, `C`, `G` or `T`. * $1 \leq l_i < r_i \leq N$ ## Input Input is given from Standard Input in the following format: $N$ $Q$ $S$ $l_1$ $r_1$ $:$ $l_Q$ $r_Q$ [samples] ## Notes A substring of a string $T$ is a string obtained by removing zero or more characters from the beginning and the end of $T$. For example, the substrings of `ATCODER` include `TCO`, `AT`, `CODER`, `ATCODER` and (the empty string), but not `AC`.

Samples

Input #1

8 3
ACACTACG
3 7
2 3
1 8

Output #1

2
0
3

*   Query $1$: the substring of $S$ starting at index $3$ and ending at index $7$ is `ACTAC`. In this string, `AC` occurs twice as a substring.
*   Query $2$: the substring of $S$ starting at index $2$ and ending at index $3$ is `CA`. In this string, `AC` occurs zero times as a substring.
*   Query $3$: the substring of $S$ starting at index $1$ and ending at index $8$ is `ACACTACG`. In this string, `AC` occurs three times as a substring.

API Response (JSON)

{
  "problem": {
    "name": "GeT AC",
    "description": {
      "content": "You are given a string $S$ of length $N$ consisting of `A`, `C`, `G` and `T`. Answer the following $Q$ queries: *   Query $i$ ($1 \\leq i \\leq Q$): You will be given integers $l_i$ and $r_i$ ($1 \\leq ",
      "description_type": "Markdown"
    },
    "platform": "AtCoder",
    "limit": {
      "time_limit": 2000,
      "memory_limit": 262144
    },
    "difficulty": "None",
    "is_remote": true,
    "is_sync": true,
    "sync_url": null,
    "sign": "abc122_c"
  },
  "statements": [
    {
      "statement_type": "Markdown",
      "content": "You are given a string $S$ of length $N$ consisting of `A`, `C`, `G` and `T`. Answer the following $Q$ queries:\n\n*   Query $i$ ($1 \\leq i \\leq Q$): You will be given integers $l_i$ and $r_i$ ($1 \\leq ...",
      "is_translate": false,
      "language": "English"
    }
  ]
}

Full JSON Raw Segments