일곱난쟁이

• 강의 듣기 전 내 풀이

const solution = (...dwarves) => {
  const sum = dwarves.reduce((a, b) => a + b);
  for (let i = 0; i < dwarves.length - 1; i++) {
    const former = dwarves[i];
    for (let j = 1; j < dwarves.length; j++) {
      const latter = dwarves[j];
      if (sum - (former + latter) == 100) {
        return dwarves.filter((v, index) => index !== i && index !== j);
      }
    }
  }
};

const result = solution(20, 7, 23, 19, 10, 15, 25, 8, 13);
console.log(result);

• 강의 풀이

function solution(arr) {
  let answer = arr;
  let sum = answer.reduce((a, b) => a + b, 0);
  for (let i = 0; i < 8; i++) {
    for (let j = i + 1; j < 9; j++) {
      if (sum - (answer[i] + answer[j]) == 100) {
        answer.splice(j, 1);
        answer.splice(i, 1);
        // 흠... 뒤에서부터 splice를 한다라...
      }
    }
  }
  return answer;
}

let arr = [20, 7, 23, 19, 10, 15, 25, 8, 13];
console.log(solution(arr));