LeetCode 1744: Can You Eat Your Favorite Candy on Your Favorite Day? Solution

Master LeetCode problem 1744 (Can You Eat Your Favorite Candy on Your Favorite Day?), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

1744. Can You Eat Your Favorite Candy on Your Favorite Day?

Medium

Array Prefix Sum

Problem Explanation

Explanation:

To solve this problem, we need to iterate through the queries and determine if it's possible to eat the favorite candy on the favorite day based on the constraints given. We can use prefix sum to calculate the total number of candies eaten by a certain day and then check if it's within the daily cap limit.

Algorithm:

Calculate the prefix sum of all candies in an array prefixSum.
For each query, calculate the total candies eaten by the favorite day using prefixSum and check if it's within the daily cap limit.
Update the answer array accordingly.

Time Complexity:

The time complexity of this approach is O(n) where n is the number of queries.

Space Complexity:

The space complexity is O(n) for storing the prefix sum array and the answer array.

Solution Code

class Solution {
    public boolean[] canEat(int[] candiesCount, int[][] queries) {
        int n = candiesCount.length;
        long[] prefixSum = new long[n];
        prefixSum[0] = candiesCount[0];
        
        for (int i = 1; i < n; i++) {
            prefixSum[i] = prefixSum[i - 1] + candiesCount[i];
        }
        
        boolean[] answer = new boolean[queries.length];
        
        for (int i = 0; i < queries.length; i++) {
            int type = queries[i][0];
            long favoriteDay = queries[i][1];
            long dailyCap = queries[i][2];
            
            long totalCandiesEaten = type == 0 ? favoriteDay + 1 : prefixSum[type - 1] / dailyCap + 1;
            long totalCandiesBeforeDay = prefixSum[type];
            
            answer[i] = totalCandiesEaten > favoriteDay && favoriteDay * dailyCap >= totalCandiesBeforeDay;
        }
        
        return answer;
    }
}

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