Golang | Leetcode Golang题解之第457题环形数组是否存在循环
题目：
题解：
func circularArrayLoop(nums []int) bool {
n := len(nums)
next := func(cur int) int {
return ((cur+nums[cur])%n + n) % n // 保证返回值在 [0,n) 中
}
for i, num := range nums {
if num == 0 {
continue
}
slow, fast := i, next(i)
// 判断非零且方向相同
for nums[slow]*nums[fast] > 0 && nums[slow]*nums[next(fast)] > 0 {
if slow == fast {
if slow == next(slow) {
break
}
return true
}
slow = next(slow)
fast = next(next(fast))
}
add := i
for nums[add]*nums[next(add)] > 0 {
tmp := add
add = next(add)
nums[tmp] = 0
}
}
return false
}