From 5ce97dd25e414a287e61130ff25f3e448697277e Mon Sep 17 00:00:00 2001
From: ImmidiSivani <147423543+ImmidiSivani@users.noreply.github.com>
Date: Sun, 28 Jul 2024 15:32:33 +0530
Subject: [PATCH] solution added to 970
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+---
+id: powerful-integers
+title: Powerful Integers
+sidebar_label: 970-Powerful Integers
+tags:
+ - Math
+ - LeetCode
+ - Java
+ - Python
+ - C++
+description: "This is a solution to the Powerful Integers problem on LeetCode."
+sidebar_position: 12
+---
+
+## Problem Description
+
+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 `x^i + y^j` 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.
+
+### Examples
+
+**Example 1:**
+
+```
+Input: x = 2, y = 3, bound = 10
+Output: [2,3,4,5,7,9,10]
+Explanation:
+2 = 2^0 + 3^0
+3 = 2^1 + 3^0
+4 = 2^0 + 3^1
+5 = 2^1 + 3^1
+7 = 2^2 + 3^1
+9 = 2^3 + 3^0
+10 = 2^0 + 3^2
+```
+
+**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`
+
+---
+
+## Solution for Powerful Integers Problem
+
+To solve this problem, we need to find all unique integers that can be represented as `x^i + y^j` and are less than or equal to `bound`. We iterate over possible values of `i` and `j` while ensuring the results stay within the bounds.
+
+### Approach
+
+1. **Iterate Over Powers:**
+ - For `x`, calculate powers `x^i` starting from `i = 0` and stopping when `x^i > bound`.
+ - For each `x^i`, calculate powers `y^j` starting from `j = 0` and stopping when `y^j > bound`.
+ - If `x^i + y^j <= bound`, add it to the result set to ensure uniqueness.
+
+2. **Handling Edge Cases:**
+ - If `x == 1`, then `x^i` will always be `1` for all `i`, so the loop should run only once for `i = 0`.
+ - Similarly, if `y == 1`, then `y^j` will always be `1`.
+
+### Code in Different Languages
+
+
+
+
+
+```cpp
+class Solution {
+public:
+ vector powerfulIntegers(int x, int y, int bound) {
+ set resultSet;
+ for (int i = 1; i < bound; i = (x == 1) ? bound : i * x) {
+ for (int j = 1; i + j <= bound; j = (y == 1) ? bound : j * y) {
+ resultSet.insert(i + j);
+ }
+ }
+ return vector(resultSet.begin(), resultSet.end());
+ }
+};
+```
+
+
+
+
+
+```java
+class Solution {
+ public List powerfulIntegers(int x, int y, int bound) {
+ Set resultSet = new HashSet<>();
+ for (int i = 1; i < bound; i = (x == 1) ? bound + 1 : i * x) {
+ for (int j = 1; i + j <= bound; j = (y == 1) ? bound + 1 : j * y) {
+ resultSet.add(i + j);
+ }
+ }
+ return new ArrayList<>(resultSet);
+ }
+}
+```
+
+
+
+
+
+```python
+class Solution:
+ def powerfulIntegers(self, x: int, y: int, bound: int) -> List[int]:
+ result_set = set()
+ i = 1
+ while i < bound:
+ j = 1
+ while i + j <= bound:
+ result_set.add(i + j)
+ if y == 1:
+ break
+ j *= y
+ if x == 1:
+ break
+ i *= x
+ return list(result_set)
+```
+
+
+
+
+#### Complexity Analysis
+
+- **Time Complexity**: $O(log_x(text{bound})*log_y(text{bound}))$, since we iterate logarithmically based on the bound.
+- **Space Complexity**: $O(k)$, where `k` is the number of unique powerful integers found.
+
+---
+
+