Problem:
Score : 200 points

Problem Statement

There are N balls placed in a row.
AtCoDeer the deer is painting each of these in one of the K colors of his paint cans.
For aesthetic reasons, any two adjacent balls must be painted in different colors.

Find the number of the possible ways to paint the balls.

Constraints

1≦N≦1000

2≦K≦1000

The correct answer is at most 2^{31}-1.

Input

The input is given from Standard Input in the following format:

N K

Output

Print the number of the possible ways to paint the balls.

Sample Input 1

2 2

Sample Output 1

2

We will denote the colors by 0 and 1. There are two possible ways: we can either paint the left ball in color 0 and the right ball in color 1, or paint the left in color 1 and the right in color 0.

Sample Input 2

1 10

Sample Output 2

10

Since there is only one ball, we can use any of the ten colors to paint it. Thus, the answer is ten.

Solution in JavaScript (Node.js 12.16.1) (judge verdict: Accepted)

const main = input => {
  const [N, K] = input.trim().split(' ').map(x => parseInt(x))
  let count = 0
  for (let i = 0; i < N; i++) {
    if (i === 0) {
      count += K
      continue
    }
    count *= (K - 1)
  }

  console.log(count)
}

// 標準入力
main(require("fs").readFileSync("/dev/stdin", "utf8"))