50.数组中重复出现的数字 知识点:数组:Set的不可重复性 题目描述 在一个长度为n的数组里的所有数字都在0到n-1的范围内. 数组中某些数字是重复的,但不知道有几个数字是重复的.也不知道每个数字重复几次.请找出数组中任一一个重复的数字. 例如,如果输入长度为7的数组[2,3,1,0,2,5,3],那么对应的输出是2或者3.存在不合法的输入的话输出-1 解法一: 直接使用暴力查找,从头开始遍历,查找相同的元素 public class Solution(){ public int duplic
Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once. Find all the elements of [1, n] inclusive that do not appear in this array. Could you do it without extra space and in O(n) runtime?
[抄题]: Given a non-empty array of integers, return the third maximum number in this array. If it does not exist, return the maximum number. The time complexity must be in O(n). Example 1: Input: [3, 2, 1] Output: 1 Explanation: The third maximum is 1.
include "stdafx.h" #include<iostream> #include<vector> #include <algorithm> #include<iomanip> #include<string> using namespace std; class Solution { public: long long nums = 0; int InversePairs(vector<int> dat
Find the kth largest element in an unsorted array. Note that it is the kth largest element in the sorted order, not the kth distinct element. For example, Given [3,2,1,5,6,4] and k = 2, return 5. Note: You may assume k is always valid, 1 ≤ k ≤ array'