freeCodeCamp/curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-172-investigating-numbers-with-few-repeated-digits.md

id	challengeType	videoUrl	localeTitle
5900f4181000cf542c50ff2b	5		问题172：调查重复数字很少的数字

Description

有多少个18位数字n（没有前导零），n中没有数字出现超过三次？

Instructions

Tests

tests:
  - text: <code>euler172()</code>应返回227485267000992000。
    testString: assert.strictEqual(euler172(), 227485267000992000);

Challenge Seed

function euler172() {
  // Good luck!
  return true;
}

euler172();

Solution

// solution required

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