Increment Decrement

AtCoder

IDabc052_b

Time2000ms

Memory256MB

Difficulty—

You have an integer variable $x$. Initially, $x=0$. Some person gave you a string $S$ of length $N$, and using the string you performed the following operation $N$ times. In the $i$\-th operation, you incremented the value of $x$ by $1$ if $S_i=$`I`, and decremented the value of $x$ by $1$ if $S_i=$`D`. Find the maximum value taken by $x$ during the operations (including before the first operation, and after the last operation). ## Constraints * $1≤N≤100$ * $|S|=N$ * No characters except `I` and `D` occur in $S$. ## Input The input is given from Standard Input in the following format: $N$ $S$ [samples]

Samples

Input #1

5
IIDID

Output #1

2

After each operation, the value of $x$ becomes $1$, $2$, $1$, $2$ and $1$, respectively. Thus, the output should be $2$, the maximum value.

Input #2

7
DDIDDII

Output #2

0

The initial value $x=0$ is the maximum value taken by $x$, thus the output should be $0$.

API Response (JSON)

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    "name": "Increment Decrement",
    "description": {
      "content": "You have an integer variable $x$. Initially, $x=0$. Some person gave you a string $S$ of length $N$, and using the string you performed the following operation $N$ times. In the $i$\\-th operation, you",
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    "platform": "AtCoder",
    "limit": {
      "time_limit": 2000,
      "memory_limit": 262144
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    "difficulty": "None",
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    "sync_url": null,
    "sign": "abc052_b"
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  "statements": [
    {
      "statement_type": "Markdown",
      "content": "You have an integer variable $x$. Initially, $x=0$.\nSome person gave you a string $S$ of length $N$, and using the string you performed the following operation $N$ times. In the $i$\\-th operation, you...",
      "is_translate": false,
      "language": "English"
    }
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