function solve (params) {
  params.pop()
  let countries = {}

  params.forEach(param => {
    let [country, contestant, points] = param.split(' -> ')

    if (!countries.hasOwnProperty(country)) {
      countries[country] = {}
    }
    if (!countries[country].hasOwnProperty(contestant)) {
      countries[country][contestant] = 0
    }

    countries[country][contestant] += Number(points)
  })

  Object.entries(countries)
    .sort((a, b) => {
      let aSum = Object.values(b[1]).reduce((n1, n2) => n1 + n2, 0)
      let bSum = Object.values(a[1]).reduce((n1, n2) => n1 + n2, 0)
      return aSum - bSum
    })
    .forEach(country => {
      let [countryName, totalPoints] = [
        country[0],
        Object.values(country[1]).reduce((a, b) => a + b, 0)
      ]
      console.log(`${countryName}: ${totalPoints}`)

      Object.entries(country[1]).forEach(contestant => {
        console.log(`-- ${contestant[0]} -> ${contestant[1]}`)
      })
    })
}