cppreference.com > C++ Algorithms > equal equal Syntax:
      #include <algorithm>
      bool equal( iterator start1, iterator end1, iterator start2 );
      bool equal( iterator start1, iterator end1, iterator start2, BinPred p );
The equal() function returns true if the elements in two ranges are the same. The first range of elements are those between start1 and end1. The second range of elements has the same size as the first range but starts at start2. If the binary predicate p is specified, then it is used instead of == to compare each pair of elements. For example, the following code uses equal() to compare two vectors of integers:
     vector<int> v1;
     for( int i = 0; i < 10; i++ ) {
       v1.push_back( i );
     }

     vector<int> v2;
     for( int i = 0; i < 10; i++ ) {
       v2.push_back( i );
     }

     if( equal( v1.begin(), v1.end(), v2.begin() ) ) {
       cout << "v1 and v2 are equal" << endl;
     } else {
       cout << "v1 and v2 are NOT equal" << endl;
     }
Related topics: find_if lexicographical_compare mismatch search