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English Version

题目描述

给定三个整数 x 、 y 和 bound ,返回 值小于或等于 bound 的所有 强整数 组成的列表 。

如果某一整数可以表示为 xi + yj ,其中整数 i >= 0 且 j >= 0,那么我们认为该整数是一个 强整数 。

你可以按 任何顺序 返回答案。在你的回答中,每个值 最多 出现一次。

 

示例 1:

输入:x = 2, y = 3, bound = 10
输出:[2,3,4,5,7,9,10]
解释: 
2 = 20 + 30
3 = 21 + 30
4 = 20 + 31
5 = 21 + 31
7 = 22 + 31
9 = 23 + 30
10 = 20 + 32

示例 2:

输入:x = 3, y = 5, bound = 15
输出:[2,4,6,8,10,14]

 

提示:

  • 1 <= x, y <= 100
  • 0 <= bound <= 106

解法

Python3

class Solution:
    def powerfulIntegers(self, x: int, y: int, bound: int) -> List[int]:
        s = set()
        i = 1
        while i < bound:
            j = 1
            while j < bound:
                if i + j <= bound:
                    s.add(i + j)
                if y == 1:
                    break
                j *= y
            if x == 1:
                break
            i *= x
        return list(s)

Java

class Solution {
    public List<Integer> powerfulIntegers(int x, int y, int bound) {
        Set<Integer> s = new HashSet<>();
        for (int i = 1; i < bound; i *= x) {
            for (int j = 1; j < bound; j *= y) {
                if (i + j <= bound) {
                    s.add(i + j);
                }
                if (y == 1) {
                    break;
                }
            }
            if (x == 1) {
                break;
            }
        }
        return new ArrayList<>(s);
    }
}

JavaScript

/**
 * @param {number} x
 * @param {number} y
 * @param {number} bound
 * @return {number[]}
 */
var powerfulIntegers = function (x, y, bound) {
    let res = new Set();
    for (let i = 1; i < bound; i *= x) {
        for (let j = 1; j < bound; j *= y) {
            if (i + j <= bound) {
                res.add(i + j);
            }
            if (y == 1) break;
        }
        if (x == 1) break;
    }
    return [...res];
};

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