LeetCode-in-Java

2554. Maximum Number of Integers to Choose From a Range I

Medium

You are given an integer array banned and two integers n and maxSum. You are choosing some number of integers following the below rules:

• The chosen integers have to be in the range [1, n].
• Each integer can be chosen at most once.
• The chosen integers should not be in the array banned.
• The sum of the chosen integers should not exceed maxSum.

Return the maximum number of integers you can choose following the mentioned rules.

Example 1:

Input: banned = [1,6,5], n = 5, maxSum = 6

Output: 2

Explanation:

You can choose the integers 2 and 4.

2 and 4 are from the range [1, 5], both did not appear in banned, and their sum is 6, which did not exceed maxSum.

Example 2:

Input: banned = [1,2,3,4,5,6,7], n = 8, maxSum = 1

Output: 0

Explanation:

You cannot choose any integer while following the mentioned conditions.

Example 3:

Input: banned = [11], n = 7, maxSum = 50

Output: 7

Explanation:

You can choose the integers 1, 2, 3, 4, 5, 6, and 7. They are from the range [1, 7], all did not appear in banned, and their sum is 28, which did not exceed maxSum.

Constraints:

• 1 <= banned.length <= 104
• 1 <= banned[i], n <= 104
• 1 <= maxSum <= 109

Solution

public class Solution {
    public int maxCount(int[] banned, int n, int maxSum) {
        boolean[] arr = new boolean[10002];
        for (int j : banned) {
            arr[j] = true;
        }
        int sum = 0;
        int count = 0;
        for (int i = 1; i <= n; i++) {
            if (!arr[i]) {
                sum += i;
                if (sum > maxSum) {
                    return count;
                }
                count++;
            }
        }
        return count;
    }
}

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