test_employees_1 = [[1,5,[2,3]],[2,3,[]],[3,3,[]]]; // id = 1 11
test_employees_2 = [[1,7,[2,3]],[2,1,[]],[3,2,[4]],[4,3,[]]]; // id = 1
test_employees_3 = [[1,2,[5]],[5,-3,[]]]; // id = 5 -3
test_employees_4 = [[1,10,[2,3,4]],[2,-1,[]],[3,-2,[]],[4,-3,[]]]; // id = 3 -2


function mapEmployeesToObj(arrEmployees) {
  const employeeObj = arrEmployees.reduce((acc, item) => {
    const id = item[0];
    const value = item?.[1] ?? 0;
    const subIds = item?.[2] ?? null;
    return {
      ...acc,
      [id]: {
        value,
        subIds
      }
    }
  }, {})
  return employeeObj;
}

const handleImportanceValue = function(employees, startId) {
  const employeeObj = mapEmployeesToObj(employees);
  const rootEmployee = employeeObj[startId]

  if (rootEmployee) {
    const calcImportanceValue = function({ value, subIds }) {
      let result = 0;
      subIds.forEach(subId => {

        const employee = employeeObj[subId];
        result += calcImportanceValue(employee);
      })
      return result + value;
    }

    return calcImportanceValue(rootEmployee)
  }

  return startId;
}
console.log(handleImportanceValue(test_employees_1, 1));
console.log(handleImportanceValue(test_employees_2, 1));
console.log(handleImportanceValue(test_employees_3, 5));
console.log(handleImportanceValue(test_employees_4, 3));