1.7 KiB
1.7 KiB
id | challengeType | title |
---|---|---|
5900f38b1000cf542c50fe9e | 5 | Problem 31: Coin sums |
Description
Instructions
Tests
tests:
- text: <code>coinSums(50)</code> should return 451.
testString: 'assert(coinSums(50) == 451, "<code>coinSums(50)</code> should return 451.");'
- text: <code>coinSums(100)</code> should return 4563.
testString: 'assert(coinSums(100) == 4563, "<code>coinSums(100)</code> should return 4563.");'
- text: <code>coinSums(150)</code> should return 21873.
testString: 'assert(coinSums(150) == 21873, "<code>coinSums(150)</code> should return 21873.");'
- text: <code>coinSums(200)</code> should return 73682.
testString: 'assert(coinSums(200) == 73682, "<code>coinSums(200)</code> should return 73682.");'
Challenge Seed
function coinSums(n) {
// Good luck!
return n;
}
coinSums(200);
Solution
const coinSums = (n) => {
const getWays = (n, m=8, c=[1, 2, 5, 10, 20, 50, 100, 200]) => {
if (n === 0) return 1;
if (m === 0 || n < 0) return 0;
return getWays(n - c[m - 1], m, c) + getWays(n, m - 1, c);
};
return getWays(n);
};