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adjacent_find() Function in C++
adjacent_find() Function in C++
This C++ program demonstrates the adjacent_find() algorithm. The adjacent_find takes iterator to the beginning and end of a container and an optional predicate as third parameter. The program uses function adjacent_find() to find adjacent pair of elements in which both the elements are same or satisfy boolean true for a predicate passed as a parameter.
Here is the source code of the C++ program which demonstrates the adjacent_find() algorithm. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.
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/*
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* C++ Program to demonstrate adjacent_find algorithm on string vector
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*/
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#include <iostream>
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#include <algorithm>
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#include <functional>
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#include <vector>
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#include <iomanip>
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using namespace std;
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void print(int a[], int len)
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{
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for(int i = 0; i < len; i++)
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{
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cout << setw(2) << a[i] << " ";
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}
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cout << endl;
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}
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int main()
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{
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int a[] = {1, 2, 3, 3, 5, 6, 6, 3};
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int alen = sizeof(a) / sizeof(int);
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int * ii = a, * ij = a;
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cout << "Array : ";
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print(a, alen);
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// Finding without use of predicates
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cout << "Pairwise elements (a, b) where a == b : ";
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while(ii <= a + alen)
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{
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ii = adjacent_find(ii, a + alen);
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if(ii != a + alen)
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cout << "(" << *ii << ", " << *(ii + 1) << ") ";
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ii = ii + 2;
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}
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cout << endl;
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// Finding with use of predicates
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sort(a, a + alen, greater<int>());
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cout << "Pairwise elements (a, b) where a >= b : ";
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while(ij <= a + alen)
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{
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ij = adjacent_find(ij, a + alen, greater_equal<int>());
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if(ij != a + alen)
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cout << "(" << *ij << ", " << *(ij + 1) << ") ";
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ij = ij + 2;
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}
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cout << endl;
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}
$ a.out Array : 1 2 3 3 5 6 6 3 Pairwise elements (a, b) where a == b : (3, 3) (6, 6) Pairwise elements (a, b) where a >= b : (6, 6) (5, 3) (3, 3) (2, 1)
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