6.8 KiB

Raw Blame History

id	title	challengeType	forumTopicId	dashedName
5900f3a91000cf542c50febc	Problem 61: Cyclical figurate numbers	5	302173	problem-61-cyclical-figurate-numbers

--description--

Triangle, square, pentagonal, hexagonal, heptagonal, and octagonal numbers are all figurate (polygonal) numbers and are generated by the following formulae:

Type of Number	Formula	Sequence
Triangle	`P_3(n) = \frac{n(n+1)}{2}`	1, 3, 6, 10, 15, ...
Square	`P_4(n) = n^2`	1, 4, 9, 16, 25, ...
Pentagonal	`P_5(n) = \frac{n(3n−1)}2`	1, 5, 12, 22, 35, ...
Hexagonal	`P_6(n) = n(2n−1)`	1, 6, 15, 28, 45, ...
Heptagonal	`P_7(n) = \frac{n(5n−3)}{2}`	1, 7, 18, 34, 55, ...
Octagonal	`P_8(n) = n(3n−2)`	1, 8, 21, 40, 65, ...

The ordered set of three 4-digit numbers: 8128, 2882, 8281, has three interesting properties.

The set is cyclic, in that the last two digits of each number is the first two digits of the next number (including the last number with the first).
Each polygonal type: triangle (P_3(127) = 8128), square (P_4(91) = 8281), and pentagonal (P_5(44) = 2882), is represented by a different number in the set.
This is the only set of 4-digit numbers with this property.

Find the sum of all numbers in ordered sets of n cyclic 4-digit numbers for which each of the P_3 to P_{n + 2} polygonal types, is represented by a different number in the set.

--hints--

cyclicalFigurateNums(3) should return a number.

assert(typeof cyclicalFigurateNums(3) === 'number');

cyclicalFigurateNums(3) should return 19291.

assert.strictEqual(cyclicalFigurateNums(3), 19291);

cyclicalFigurateNums(4) should return 28684.

assert.strictEqual(cyclicalFigurateNums(4), 28684);

cyclicalFigurateNums(5) should return 76255.

assert.strictEqual(cyclicalFigurateNums(5), 76255);

cyclicalFigurateNums(6) should return 28684.

assert.strictEqual(cyclicalFigurateNums(6), 28684);

--seed--

--seed-contents--

function cyclicalFigurateNums(n) {

  return true;
}

cyclicalFigurateNums(3);

--solutions--

function cyclicalFigurateNums(n) {
  function getChains(chain, n, numberTypes, numsExcludingLastNeededType) {
    if (chain.length === n) {
      return [chain];
    }

    const nextNumbers = getNextNumbersInChain(
      chain[chain.length - 1],
      numsExcludingLastNeededType
    );

    const chains = [];
    for (let j = 0; j < nextNumbers.length; j++) {
      const nextNumber = nextNumbers[j];
      if (chain.indexOf(nextNumber) === -1) {
        const nextChain = [...chain, nextNumber];
        chains.push(
          ...getChains(nextChain, n, numberTypes, numsExcludingLastNeededType)
        );
      }
    }
    return chains;
  }

  function getNextNumbersInChain(num, numsExcludingLastNeededType) {
    const results = [];
    const beginning = num % 100;
    numsExcludingLastNeededType.forEach(number => {
      if (Math.floor(number / 100) === beginning) {
        results.push(number);
      }
    });
    return results;
  }

  function fillNumberTypes(n, numberTypes, numsExcludingLastNeededType) {
    const [, lastTypeCheck, lastTypeArr] = numberTypes[n - 1];

    for (let i = 1000; i <= 9999; i++) {
      for (let j = 0; j < n - 1; j++) {
        const [, typeCheck, typeArr] = numberTypes[j];
        if (typeCheck(i)) {
          typeArr.push(i);
          numsExcludingLastNeededType.add(i);
        }
      }

      if (lastTypeCheck(i)) {
        lastTypeArr.push(i);
      }
    }
  }

  function isCyclicalChain(chain, n, numberTypes) {
    const numberTypesInChain = getNumberTypesInChain(chain, numberTypes);

    if (!isChainAllowed(numberTypesInChain, n)) {
      return false;
    }

    const isChainCyclic =
      Math.floor(chain[0] / 100) === chain[chain.length - 1] % 100;
    return isChainCyclic;
  }

  function getNumberTypesInChain(chain, numberTypes) {
    const numbersInChain = {};
    for (let i = 0; i < numberTypes.length; i++) {
      const numberTypeName = numberTypes[i][0];
      numbersInChain[numberTypeName] = [];
    }

    for (let i = 0; i < chain.length; i++) {
      for (let j = 0; j < n; j++) {
        const [typeName, , typeNumbers] = numberTypes[j];
        const typeNumbersInChain = numbersInChain[typeName];
        if (typeNumbers.indexOf(chain[i]) !== -1) {
          typeNumbersInChain.push(chain[i]);
        }
      }
    }
    return numbersInChain;
  }

  function isChainAllowed(numberTypesInChain, n) {
    for (let i = 0; i < n; i++) {
      const typeName = numberTypes[i][0];
      const isNumberWithTypeInChain = numberTypesInChain[typeName].length > 0;
      if (!isNumberWithTypeInChain) {
        return false;
      }

      for (let j = i + 1; j < n; j++) {
        const otherTypeName = numberTypes[j][0];
        if (
          isNumberRepeatedAsOnlyNumberInTwoTypes(
            numberTypesInChain[typeName],
            numberTypesInChain[otherTypeName]
          )
        ) {
          return false;
        }
      }
    }
    return true;
  }

  function isNumberRepeatedAsOnlyNumberInTwoTypes(
    typeNumbers,
    otherTypeNumbers
  ) {
    return (
      typeNumbers.length === 1 &&
      otherTypeNumbers.length === 1 &&
      typeNumbers[0] === otherTypeNumbers[0]
    );
  }

  function isTriangle(num) {
    return ((8 * num + 1) ** 0.5 - 1) % 2 === 0;
  }

  function isSquare(num) {
    return num ** 0.5 === parseInt(num ** 0.5, 10);
  }

  function isPentagonal(num) {
    return ((24 * num + 1) ** 0.5 + 1) % 6 === 0;
  }

  function isHexagonal(num) {
    return ((8 * num + 1) ** 0.5 + 1) % 4 === 0;
  }

  function isHeptagonal(num) {
    return ((40 * num + 9) ** 0.5 + 3) % 10 === 0;
  }

  function isOctagonal(num) {
    return ((3 * num + 1) ** 0.5 + 1) % 3 === 0;
  }

  const numberTypes = [
    ['triangle', isTriangle, []],
    ['square', isSquare, []],
    ['pentagonal', isPentagonal, []],
    ['hexagonal', isHexagonal, []],
    ['heptagonal', isHeptagonal, []],
    ['octagonal', isOctagonal, []]
  ];
  const numsExcludingLastNeededType = new Set();
  fillNumberTypes(n, numberTypes, numsExcludingLastNeededType);

  const nNumberChains = [];
  const [, , lastType] = numberTypes[n - 1];
  for (let i = 0; i < lastType.length; i++) {
    const startOfChain = lastType[i];
    nNumberChains.push(
      ...getChains([startOfChain], n, numberTypes, numsExcludingLastNeededType)
    );
  }

  const cyclicalChains = nNumberChains.filter(chain =>
    isCyclicalChain(chain, n, numberTypes)
  );

  let sum = 0;
  for (let i = 0; i < cyclicalChains.length; i++) {
    for (let j = 0; j < cyclicalChains[0].length; j++) {
      sum += cyclicalChains[i][j];
    }
  }
  return sum;
}

6.8 KiB Raw Blame History Unescape Escape