标签:Integers 20 10 int 31 Powerful bound 0970 integers
Powerful Integers (M)
题目
Given three integers x
, y
, and bound
, return a list of all the powerful integers that have a value less than or equal to bound
.
An integer is powerful if it can be represented as xi + yj
for some integers i >= 0
and j >= 0
.
You may return the answer in any order. In your answer, each value should occur at most once.
Example 1:
Input: x = 2, y = 3, bound = 10
Output: [2,3,4,5,7,9,10]
Explanation:
2 = 20 + 30
3 = 21 + 30
4 = 20 + 31
5 = 21 + 31
7 = 22 + 31
9 = 23 + 30
10 = 20 + 32
Example 2:
Input: x = 3, y = 5, bound = 15
Output: [2,4,6,8,10,14]
Constraints:
1 <= x, y <= 100
0 <= bound <= 10^6
题意
求所有小于等于bound的x幂与y幂之和。
思路
直接二重循环,用HashSet去重。
代码实现
Java
class Solution {
public List<Integer> powerfulIntegers(int x, int y, int bound) {
Set<Integer> hash = new HashSet<>();
for (int a = 1; a < bound; a *= x) {
for (int b = 1; a + b <= bound; b *= y) {
hash.add(a + b);
if (y == 1) break;
}
if (x == 1) break;
}
return new ArrayList<>(hash);
}
}
标签:Integers,20,10,int,31,Powerful,bound,0970,integers 来源: https://www.cnblogs.com/mapoos/p/14722508.html
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