【LeetCode】169. Majority Element

原题链接：https://leetcode.com/problems/majority-element/description/

要求：

Given an array of size n, find the majority element. The majority element is the element that appears more than ⌊ n/2 ⌋ times.

You may assume that the array is non-empty and the majority element always exist in the array.

想法：

1.比较普通的想法，有一个标记，初始值为1，对应一个计数初始值为1.

遍历数组，若数组值和标记值相等，计数加一；否则计数减一，当计数为0时，更改标记值为当前数组值。代码如下：

 1 class Solution {
 2 public:
 3     int majorityElement(vector<int>& nums) {
 4         int res = nums[0];
 5         int count = 1;
 6         for (int i = 1;i < nums.size(); ++i) {
 7             if (res == nums[i]) count++;
 8             else {
 9                 count--;
10                 if (count == 0) {
11                     res = nums[i];
12                     count = 1;
13                 }
14             }
15         }
16         return res;
17     }
18 };

2.首先将整个数组排序，由题意返回数组中间值即可。代码如下：

class Solution {
public:  int majorityElement(vector<int>& nums) {  sort(nums.begin(),  nums.end());  return nums[nums.size() / 2];  }
};

第二个方法代码量相对较少，容易想到，不过我比较了一下运行时间，还是第一个方法的时间少。

转载于:https://www.cnblogs.com/jialei-bupt/p/7259400.html

【LeetCode】169. Majority Element相关推荐

【LeetCode】169. Majority Element 解题小结
题目:Given an array of size n, find the majority element. The majority element is the element that app ...
leetcode讲解--169. Majority Element
169. Majority Element Given an array of size n, find the majority element. The majority element is t ...
LeetCode - Easy - 169. Majority Element
Topic Array Divide and Conquer Bit Manipulation Description https://leetcode.com/problems/majority-e ...
【leetcode】解题日记（未完待续）
开坑,有生之年系列,希望有一天能解出 leetcodeleetcodeleetcode 上的所有题目. 写题解好麻烦,懒得写(手动狗头),进度如下,不定期更新. 总题数已解答题解数 2058 23 ...
[勇者闯LeetCode] 169. Majority Element
[勇者闯LeetCode] 169. Majority Element Description Given an array of size n, find the majority element. ...
【LeetCode】309. Best Time to Buy and Sell Stock with Cooldown 最佳买卖股票时机含冷冻期（Medium）（JAVA）
[LeetCode]309. Best Time to Buy and Sell Stock with Cooldown 最佳买卖股票时机含冷冻期(Medium)(JAVA) 题目地址: https: ...
【Leetcode】100. 相同的树
题目给定两个二叉树,编写一个函数来检验它们是否相同. 如果两个树在结构上相同,并且节点具有相同的值,则认为它们是相同的. 示例 1: 输入: 1 1/ \ / \2 3 2 3[1,2,3], [1 ...
【leetcode】85. Maximal Rectangle 0/1矩阵的最大全1子矩阵
1. 题目 Given a 2D binary matrix filled with 0's and 1's, find the largest rectangle containing only 1 ...
【leetcode】486. Predict the Winner
题目如下: Given an array of scores that are non-negative integers. Player 1 picks one of the numbers fro ...

【LeetCode】169. Majority Element

【LeetCode】169. Majority Element相关推荐

最新文章

热门文章