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The goal is to find the maximum number of unique types of candies Alice can eat. We can take the following steps:
maxCandies = n / 2.maxCandies.Time Complexity: O(n) because we iterate over the array to create the set.
Space Complexity: O(n) for storing the unique types in a set.
1#include <stdio.h>
2#include <stdlib.h>
3
4int cmpfunc(const void *a, const void *b) {
5 return (*(int*)a - *(int*)b);
6}
7
8int distributeCandies(int* candyType, int candyTypeSize) {
9 qsort(candyType, candyTypeSize, sizeof(int), cmpfunc);
10 int uniqueTypes = 1;
11 for (int i = 1; i < candyTypeSize; i++) {
12 if (candyType[i] != candyType[i - 1])
13 uniqueTypes++;
14 }
15 return (uniqueTypes < candyTypeSize / 2) ? uniqueTypes : candyTypeSize / 2;
16}The solution sorts the candy types to easily count unique types. After sorting, a single pass through the array determines the number of unique types. The result is the minimum between the unique types and n / 2.
For another perspective:
n / 2.Time Complexity: O(n) for creating the counter.
Space Complexity: O(n) for storing unique types in the counter.
1using System.Collections.Generic;
public class Solution {
public int DistributeCandies(int[] candyType) {
Dictionary<int, int> candyMap = new Dictionary<int, int>();
foreach (var candy in candyType) {
if (!candyMap.ContainsKey(candy)) {
candyMap[candy] = 0;
}
candyMap[candy]++;
}
return Math.Min(candyMap.Count, candyType.Length / 2);
}
}C# solution with Dictionary to tabulate candy counts, checking count of keys versus n / 2 for the answer.