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3232. Find if Digit Game Can Be Won

Description

You are given an array of positive integers nums.

Alice and Bob are playing a game. In the game, Alice can choose either all single-digit numbers or all double-digit numbers from nums, and the rest of the numbers are given to Bob. Alice wins if the sum of her numbers is strictly greater than the sum of Bob's numbers.

Return true if Alice can win this game, otherwise, return false.

 

Example 1:

Input: nums = [1,2,3,4,10]

Output: false

Explanation:

Alice cannot win by choosing either single-digit or double-digit numbers.

Example 2:

Input: nums = [1,2,3,4,5,14]

Output: true

Explanation:

Alice can win by choosing single-digit numbers which have a sum equal to 15.

Example 3:

Input: nums = [5,5,5,25]

Output: true

Explanation:

Alice can win by choosing double-digit numbers which have a sum equal to 25.

 

Constraints:

  • 1 <= nums.length <= 100
  • 1 <= nums[i] <= 99

Solutions

Solution 1: Summation

According to the problem description, as long as the sum of the units digits is not equal to the sum of the tens digits, Xiaohong can always choose a larger sum to win.

The time complexity is $O(n)$, where $n$ is the length of the array $\textit{nums}$. The space complexity is $O(1)$.

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class Solution:
    def canAliceWin(self, nums: List[int]) -> bool:
        a = sum(x for x in nums if x < 10)
        b = sum(x for x in nums if x > 9)
        return a != b

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class Solution {
    public boolean canAliceWin(int[] nums) {
        int a = 0, b = 0;
        for (int x : nums) {
            if (x < 10) {
                a += x;
            } else {
                b += x;
            }
        }
        return a != b;
    }
}

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class Solution {
public:
    bool canAliceWin(vector<int>& nums) {
        int a = 0, b = 0;
        for (int x : nums) {
            if (x < 10) {
                a += x;
            } else {
                b += x;
            }
        }
        return a != b;
    }
};

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func canAliceWin(nums []int) bool {
    a, b := 0, 0
    for _, x := range nums {
        if x < 10 {
            a += x
        } else {
            b += x
        }
    }
    return a != b
}

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function canAliceWin(nums: number[]): boolean {
    let [a, b] = [0, 0];
    for (const x of nums) {
        if (x < 10) {
            a += x;
        } else {
            b += x;
        }
    }
    return a !== b;
}

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