LeetCode 238. 除自身以外数组的乘积(Product of Array Except Self)

238. 除自身以外数组的乘积
238. Product of Array Except Self

题目描述

LeetCode

LeetCode238. Product of Array Except Self中等

Java 实现

class Solution {
    public int[] productExceptSelf(int[] nums) {
        int n = nums.length;
        int[] before = new int[n], after = new int[n], res = new int[n];
        before[0] = 1;
        after[n - 1] = 1;
        for (int i = 1; i < n; i++) {
            before[i] = before[i - 1] * nums[i - 1];
        }
        for (int i = n - 2; i >= 0; i--) {
            after[i] = after[i + 1] * nums[i + 1];
        }
        for (int i = 0; i < n; i++) {
            res[i] = after[i] * before[i];
        }
        return res;
    }
}

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参考资料

• https://leetcode.com/problems/product-of-array-except-self/
• https://leetcode-cn.com/problems/product-of-array-except-self/