Distribute Candies (E)
题目
Alice has n candies, where the ith candy is of type candyType[i]. Alice noticed that she started to gain weight, so she visited a doctor.
The doctor advised Alice to only eat n / 2 of the candies she has (n is always even). Alice likes her candies very much, and she wants to eat the maximum number of different types of candies while still following the doctor's advice.
Given the integer array candyType of length n, return the maximum number of different types of candies she can eat if she only eats n / 2 of them.
Example 1:
Input: candyType = [1,1,2,2,3,3]
Output: 3
Explanation: Alice can only eat 6 / 2 = 3 candies. Since there are only 3 types, she can eat one of each type.
Example 2:
Input: candyType = [1,1,2,3]
Output: 2
Explanation: Alice can only eat 4 / 2 = 2 candies. Whether she eats types [1,2], [1,3], or [2,3], she still can only eat 2 different types.
Example 3:
Input: candyType = [6,6,6,6]
Output: 1
Explanation: Alice can only eat 4 / 2 = 2 candies. Even though she can eat 2 candies, she only has 1 type.
Constraints:
n == candyType.length2 <= n <= 10^4nis even.-10^5 <= candyType[i] <= 10^5
题意
给定长度为n的数组，从中取n/2个，使得这n/2个数中不同的数的个数最多。
思路
统计不同种类的个数，最后和n/2比较即可。
代码实现
Java
class Solution {
public int distributeCandies(int[] candyType) {
Set<Integer> set = new HashSet<>();
int types = 0;
for (int type : candyType) {
set.add(type);
}
return Math.min(set.size(), candyType.length / 2);
}
}
```# Distribute Candies (E)
## 题目
Alice has `n` candies, where the `ith` candy is of type `candyType[i]`. Alice noticed that she started to gain weight, so she visited a doctor.
The doctor advised Alice to only eat `n / 2` of the candies she has (`n` is always even). Alice likes her candies very much, and she wants to eat the maximum number of different types of candies while still following the doctor's advice.
Given the integer array `candyType` of length `n`, return *the **maximum** number of different types of candies she can eat if she only eats* `n / 2` *of them*.
**Example 1:**
Input: candyType = [1,1,2,2,3,3]
Output: 3
Explanation: Alice can only eat 6 / 2 = 3 candies. Since there are only 3 types, she can eat one of each type.
**Example 2:**
Input: candyType = [1,1,2,3]
Output: 2
Explanation: Alice can only eat 4 / 2 = 2 candies. Whether she eats types [1,2], [1,3], or [2,3], she still can only eat 2 different types.
**Example 3:**
Input: candyType = [6,6,6,6]
Output: 1
Explanation: Alice can only eat 4 / 2 = 2 candies. Even though she can eat 2 candies, she only has 1 type.
**Constraints:**
- `n == candyType.length`
- `2 <= n <= 10^4`
- `n` is even.
- `-10^5 <= candyType[i] <= 10^5`
---
## 题意
给定长度为n的数组，从中取n/2个，使得这n/2个数中不同的数的个数最多。
## 思路
统计不同种类的个数，最后和n/2比较即可。
---
## 代码实现
### Java
```java
class Solution {
public int distributeCandies(int[] candyType) {
Set<Integer> set = new HashSet<>();
int types = 0;
for (int type : candyType) {
set.add(type);
}
return Math.min(set.size(), candyType.length / 2);
}
}