49 lines
955 B
Go
49 lines
955 B
Go
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/*
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* @Author : huangzj
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* @Time : 2021/3/16 15:45
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* @Description：
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*/
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package NumberMoreThan
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type NumberMoreThanHalfObj struct{}
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func (n *NumberMoreThanHalfObj) Doc() string {
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return `
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题目：
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数组中有一个数字出现的次数超过数组长度的一半，请找出这个数字。
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例如输入一个长度为9的数组{1,2,3,2,2,2,5,4,2}。由于数字2在数组中出现了5次，超过数组长度的一半，因此输出2。
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要求：时间复杂度O(N),空间复杂度O(1)
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`
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}
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func NumberMoreThanHalf(numList []int) int {
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var number, count int
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for _, j := range numList {
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if number == j {
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count++
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} else if number != j && count <= 1 {
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number = j
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} else {
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//number !=j && count >1
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count--
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}
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}
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//最后验证，确保一定超过
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countValid := 0
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for _, j := range numList {
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if j == number {
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countValid++
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}
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}
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if countValid <= len(numList)/2 {
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return -1
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}
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return number
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}
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