1.7 KiB
1.7 KiB
id | challengeType | title |
---|---|---|
5900f39c1000cf542c50feaf | 5 | Problem 48: Self powers |
Description
Instructions
Tests
tests:
- text: <code>selfPowers(10, 3)</code> should return 317.
testString: assert.strictEqual(selfPowers(10, 3), 317, '<code>selfPowers(10, 3)</code> should return 317.');
- text: <code>selfPowers(150, 6)</code> should return 29045.
testString: assert.strictEqual(selfPowers(150, 6), 29045, '<code>selfPowers(150, 6)</code> should return 29045.');
- text: <code>selfPowers(673, 7)</code> should return 2473989.
testString: assert.strictEqual(selfPowers(673, 7), 2473989, '<code>selfPowers(673, 7)</code> should return 2473989.');
- text: <code>selfPowers(1000, 10)</code> should return 9110846700.
testString: assert.strictEqual(selfPowers(1000, 10), 9110846700, '<code>selfPowers(1000, 10)</code> should return 9110846700.');
Challenge Seed
function selfPowers(power, lastDigits) {
// Good luck!
return true;
}
selfPowers(1000, 10);
Solution
function selfPowers(power, lastDigits) {
let sum = 0;
const modulo = Math.pow(10, lastDigits);
for (let i = 1; i <= power; i++) {
let temp = i;
for (let j = 1; j < i; j++) {
temp *= i;
temp %= modulo;
}
sum += temp;
sum %= modulo;
}
return sum;
}