function icecreamParlor(m, arr) {
    for (let i = 0; i < arr.length; i++) {
        let balance = m - arr[i];
        let find = arr.findIndex((num, index) => {
            return i != index && num === balance
        })
        if(find != -1) {
            return [i + 1, find + 1]
        }
    }
}