26 de dez. de 2025

Problem 17

Number letter counts

Problem 17

If the numbers from 1 to 5 are written out in words: one, two, three, four, five, then there are 5 + 4 + 4 + 4 + 5 = 22 letters used in total.

If all the numbers from 1 to 1000 (one thousand) inclusive were written out in words, how many letters would be used?

NOTE: Do not count spaces or hyphens. For example, 342 (three hundred and forty-two) contains 23 letters and 115 (one hundred and fifteen) contains 20 letters. The use of "and" when writing out numbers is in compliance with British usage

Tentativa 1 - 26/12/2025

Tentar quebrar em partes

345 = 300 + 40 + 5 = three hundred + AND+ forty five?

o AND vem sempre entre centena e dezena

JavaScript REPL

function problem17() {
  let sum = 0;
  for (let i = 1; i <= 1000; i++) {
    sum += writeNumberInWords(i).len;
  }
  return sum;
}

console.log(writeNumberInWords(6));
console.log(writeNumberInWords(9));
console.log(writeNumberInWords(10));
console.log(writeNumberInWords(14));
console.log(writeNumberInWords(25));
console.log(writeNumberInWords(48));
console.log(writeNumberInWords(99));
console.log(writeNumberInWords(100));
console.log(writeNumberInWords(102));
console.log(writeNumberInWords(115));
console.log(writeNumberInWords(145));
console.log(writeNumberInWords(200));
console.log(writeNumberInWords(290));
console.log(writeNumberInWords(342));
console.log(writeNumberInWords(999));
console.log(writeNumberInWords(1000));

console.log(problem17());

21124 correto

Problem 16

Power digit sum

Problem 18

Maximum path sum I

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