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Sort in C++ STL
About Sorting in STL
Sorting is defined as arranging the data in a particular order, which can be increasing , decreasing or in any specific way. Sorting in STL is done by inbuilt function sort().
Syntax of Sort() :
sort (RandomAccessIterator first, RandomAccessIterator last, Compare comp);The function doesn’t produce a result. Just the items/elements from the first to the last iterations are updated. The third parameter, comp, must be a function that establishes the hierarchy of the components to be sorted in. If nothing else is supplied, the sorting happens in ascending order.
Example of Sorting in Ascending Order :
#include<iostream>
#include<bits/stdc++.h>
using namespace std;
int main() {
vector arr;
arr.push_back(34);
arr.push_back(70);
arr.push_back(20);
arr.push_back(56);
arr.push_back(1);
cout<<"The element of array before sorting : ";
for(int i=0;i < arr.size();i++){
cout<< arr[i]<<" ";
}
cout<< endl;
// sort function to sorting the elements
sort(arr.begin(), arr.end());
cout<<"The element of array after sorting : ";
for(int i=0;i < arr.size();i++){
cout<< arr[i]<<" ";
}
return 0;
}
Output :
The element of array before sorting : 34 70 20 56 1 The element of array after sorting : 1 20 34 56 70
In the above program, we take the array and used sort function to sort the elements in ascending order as comparator is not used , by default elements are arranged in ascending order.
Example of Sorting in Descending Order:
#include<iostream>
#include<bits/stdc++.h>
using namespace std;
int main() {
vector arr;
arr.push_back(34);
arr.push_back(70);
arr.push_back(20);
arr.push_back(56);
arr.push_back(1);
cout<<"The element of array before sorting : ";
for(int i=0;i< arr.size();i++){
cout<< arr[i]<<" ";
}
cout<());
cout<<"The element of array after sorting : ";
for(int i=0;i< arr.size();i++){
cout<< arr[i]<<" ";
}
return 0;
}
Output :
The element of array before sorting : 34 70 20 56 1 The element of array after sorting : 70 56 34 20 1
In the above program, we take the array and used sort function to sort the elements in decreasing order as greater<int>() comparator is used to sort the elements in decreasing order
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