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| // @Title: 摆动序列 (Wiggle Subsequence)
// @Author: 15816537946@163.com
// @Date: 2020-12-13 19:18:24
// @Runtime: 0 ms
// @Memory: 2.1 MB
// 贪心
func wiggleMaxLength(nums []int) int {
n := len(nums)
if n < 2 {
return n
}
ret := 1
prevDiff := nums[1] - nums[0]
if prevDiff != 0 {
ret = 2
}
for i := 2; i < n; i++ {
diff := nums[i] - nums[i-1]
if diff > 0 && prevDiff < 0 || diff < 0 && prevDiff > 0 {
ret++
prevDiff = diff
}
}
return ret
}
|