freeCodeCamp/curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-48-self-powers.md

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id title challengeType videoUrl dashedName
5900f39c1000cf542c50feaf 问题48自我权力 5 problem-48-self-powers

--description--

系列1 1 + 2 2 + 3 3 + ... + 10 10 = 10405071317.查找该系列的最后十位数字1 1 + 2 2 + 3 3 + ... + 1000 1000

--hints--

selfPowers(10, 3)应该返回317。

assert.strictEqual(selfPowers(10, 3), 317);

selfPowers(150, 6)应返回29045。

assert.strictEqual(selfPowers(150, 6), 29045);

selfPowers(673, 7)应该返回2473989。

assert.strictEqual(selfPowers(673, 7), 2473989);

selfPowers(1000, 10)应该返回9110846700。

assert.strictEqual(selfPowers(1000, 10), 9110846700);

--seed--

--seed-contents--

function selfPowers(power, lastDigits) {

  return true;
}

selfPowers(1000, 10);

--solutions--

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;
}