function freqQuery(queries) {
  let map = new Map(), result = []
  for (let [op, val] of queries) {
    switch (op) {
      case 1: {
        map.has(val) ? map.set(val, map.get(val) + 1) : map.set(val, 1)
        break
      }
      case 2: {
        if (map.has(val) && map.get(val) > 0)
          map.set(val, map.get(val) - 1)
        break
      }
      case 3: {
        if ([...map.values()].includes(val))
          result.push(1)
        else
          result.push(0)
      }
    }
  }
  return result
}