[javascript-algorithm]プログラマー-残高の計算

(1)問題リンク

(2)解答と解説1

-問題を解く

        let price = 3;
        let money = 20;
        let count = 4;

        function solution1(price, money, count){
            let answer = 0;

            for(let i = 1; i <= count; i++) answer += price * i

            return answer > money ? answer - money : 0;
        }

        console.log(solution1(price, money, count)); // 10

-問題の説明

（2）問題解きと説明2

-問題を解く

        let price = 3;
        let money = 20;
        let count = 4;

        function solution2(price, money, count) {
            const tmp = price * count * (count + 1) / 2 - money;
            return tmp > 0 ? tmp : 0;
        }

        console.log(solution2(price, money, count)) // 10

-問題の説明

（2）問題解きと解説3

-問題を解く

        let price = 3;
        let money = 20;
        let count = 4;

        const solution3 = (...list) => Math.max(list[0] * list[2] * ++list[2] / 2 - list[1], 0);

        console.log(solution3(price, money, count)) // 10

-問題の説明

（3）参考資料