UNIQUE function
UNIQUE () function is a default function, the function of Unique's function unique in STL is to remove adjacent repeating elements (only one), and an easy ignore feature is it It doesn't really delete the duplicate element. He is a function in C ++, so the header file should be added #include, the specific usage is as follows:

int num[10];

Unique (NUM, NUN + N) is returned by Num to the tail address of the non-repetitive element, which is said to be deleted than the repeated element, in fact, the function moves repeated elements to the back, Then it is still saved in the original number group and then returns the address of the last element, because the unique removes the adjacent repeating elements, so it is necessary to discharge the next order before use.

Below is a small example of using the UNIQUE function to retrieve, I believe that if you understand the following example, you will use the UNQIUE function to go back.

#include<iostream>
#include<string>
#include<algorithm>
using namespace std;

int num[10]={1,2,3,8,7,5,3,1,2,4};
int main()
{
    sort(num,num+10);
    cout<<"Elements before going to the top:"<<endl;
    for(int i=0;i<10;i++)
    {
        cout<<num[i]<<" ";
    }
    cout<<endl;
    sort(num,num+10);
    int len=unique(num,num+10)-num;// Number of not repeated elements after heavy weight
    cout<<"The number of elements after returning is:"<<len<<endl;
    cout<<"The elements of the backward are:";
    for(int i=0;i<len;i++)
    {
        cout<<num[i]<<" ";
    }
    cout<<endl;
    return 0;
}
/*
 Before you get the element:
1 1 2 2 3 3 4 5 7 8
 The number of elements after retransmission is: 7
 The elements that are retained are: 1 2 3 4 5 7 8
*/

Of course, UNIQUE can also be re-emphasized.

#include <iostream>
#include <string>
#include <algorithm>

using namespace std;
int main()
{
    string str("Helloword!_Helloword!");
    cout<<str<<endl;
    sort( str.begin(),str.end());// Sort
    cout<<str<<endl;
    str.erase(unique(str.begin(),str.end()),str.end());// unique () Move the duplicate element to the end and returns the last element of the last element
    cout<<str<<endl;
    return 0;
}