function luckBalance(k, contests) {
  const importantContestsVals = []
  let val = 0;
  
  for (let i = 0; i < contests.length; i++) { 
    if (contests[i][1]) {
      importantContestsVals.push(contests[i][0])
    } else { 
      val += contests[i][0]
    }
  }
  
  importantContestsVals.sort((a, b) => a - b)
  const negativeArr = importantContestsVals.splice(0, importantContestsVals.length - k)
  const largestArr = negativeArr.length >= importantContestsVals.length ? negativeArr.length : importantContestsVals.length

  for (let j = 0; j < largestArr; j++) { 
    if (negativeArr[j]) { 
      val -= negativeArr[j]
    }
    if (importantContestsVals[j]) { 
      val += importantContestsVals[j]
    }
  }

  return val
}