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Working with Array and Vectors using STL in C++
Array and vectors are very important data structures in competitive programming for solving problems. And the STL (Standard Template Library) in c++ programming provide some functions to perform operations of arrays and vectors.
Let’s see some of these functions in action,
Finding sum, Min and Max of the array/vector − In STL there are function that helps you to find the sum, max, and min of the array/vector. Functions with there function,
Finding sum
accumulate(startIndex, endIndex, initialSum)
Greatest element of the array/vecto
*max_element(startIndex, endIndex)
Smallest element of array/vector
*min_element(startIndex, endIndex)
Program to perform operations on array −
Example
#include <bits/stdc++.h>
using namespace std;
int main(){
int array[] = {65, 7,12, 90, 31, 113 };
int l = sizeof(array) / sizeof(array[0]);
cout<<"The elments of the array are : ";
for(int i = 0; i<l; i++)
cout<<array[i]<<"\t";
cout<<endl;
cout<<"The sum of all elements of the array: "<<accumulate(array, array + l, 0)<<endl;
cout<<"The element with maximum value in array: "<<*max_element(array, array + l)<<endl;
cout<<"The element with minimum value in array: "<<*min_element(array, array + l)<<endl;
return 0;
}Output
The elments of the array are : 65 7 12 90 31 113 The sum of all elements of the array: 318 The element with maximum value in array: 113 The element with minimum value in array: 7
Program to perform operations on vector −
Example
#include <bits/stdc++.h>
using namespace std;
int main(){
vector<int> vec= {65, 7,12, 90, 31, 113 };
cout<<"The sum of all elments of the vector: "<<accumulate(vec.begin(), vec.end() + 1, 0)<<endl;
cout<<"The element with maximum value in vector: "<<*max_element(vec.begin(), vec.end())<<endl;
cout<<"The element with minimum value in vector: "<<*min_element(vec.begin(), vec.end())<<endl;
return 0;
}Output
The sum of all elments of the vector: 318 The element with maximum value in vector: 113 The element with minimum value in vector: 7
Sorting elements of the array/vector −
In STL, there is a function sort() which can be used to sort elements of the array/vector. The function uses quick sort technique for sorting array/vector.
Syntax
sort(startIndex, endIndex)
Program to sort elements of the array −
Example
#include <bits/stdc++.h>
using namespace std;
int main(){
int array[] = {65, 7,12, 90, 31, 113 };
int l = sizeof(array) / sizeof(array[0]);
cout<<"The elments of the array are : ";
for(int i = 0; i<l; i++)
cout<<array[i]<<"\t";
cout<<endl;
cout<<"\nSorting elements of the array…\n\n";
sort(array, array+l);
cout<<"The sorted array is : ";
for(int i = 0; i<l; i++)
cout<<array[i]<<"\t";
cout<<endl;
return 0;
}Output
The elments of the array are : 65 7 12 90 31 113 Sorting elements of the array... The sorted array is : 7 12 31 65 90 113
Program to sort elements of vector −
Example
#include <bits/stdc++.h>
using namespace std;
int main(){
vector<int> vec = {65, 7,12, 90, 31, 113 };
cout<<"The elments of the vector are : ";
for(int i = 0; i<vec.size(); i++)
cout<<vec[i]<<"\t";
cout<<endl;
cout<<"\nSorting elements of the vector...\n\n";
sort(vec.begin(), vec.end());
cout<<"The sorted vector is : ";
for(int i = 0; i<vec.size(); i++)
cout<<vec[i]<<"\t";
cout<<endl;
return 0;
}Output
The elments of the vector are : 65 7 12 90 31 113 Sorting elements of the vector... The sorted vector is : 7 12 31 65 90 113
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