Java | Leetcode Java题解之第457题环形数组是否存在循环

题目：

题解：

class Solution {
    public boolean circularArrayLoop(int[] nums) {
        int n = nums.length;
        for (int i = 0; i < n; i++) {
            if (nums[i] == 0) {
                continue;
            }
            int slow = i, fast = next(nums, i);
            // 判断非零且方向相同
            while (nums[slow] * nums[fast] > 0 && nums[slow] * nums[next(nums, fast)] > 0) {
                if (slow == fast) {
                    if (slow != next(nums, slow)) {
                        return true;
                    } else {
                        break;
                    }
                }
                slow = next(nums, slow);
                fast = next(nums, next(nums, fast));
            }
            int add = i;
            while (nums[add] * nums[next(nums, add)] > 0) {
                int tmp = add;
                add = next(nums, add);
                nums[tmp] = 0;
            }
        }
        return false;
    }

    public int next(int[] nums, int cur) {
        int n = nums.length;
        return ((cur + nums[cur]) % n + n) % n; // 保证返回值在 [0,n) 中
    }
}

原文地址：https://blog.csdn.net/m0_57195758/article/details/142710287

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