c++ 判断两个容器是否相等（equal）

#include <iostream>     // cout
#include <algorithm>    // equal
#include <vector>       // vector
using namespace std;
bool mypredicate (int i, int j) {
    return (i==j);
}

int main () {
    int myints[] = {20,40,60,80,100};               //   myints: 20 40 60 80 100
    vector<int>myvector (myints,myints+5);     // myvector: 20 40 60 80 100
    
    // using default comparison:
    if ( equal (myvector.begin(), myvector.end(), myints) )
        cout << "The contents of both sequences are equal.
";
    else
        cout << "The contents of both sequences differ.
";
    
    myvector[3]=81;                                 // myvector: 20 40 60 81 100
    
    // using predicate comparison:
    if ( equal (myvector.begin(), myvector.end(), myints, mypredicate) )
        cout << "The contents of both sequences are equal.
";
    else
        cout << "The contents of both sequences differ.
";
    
    return 0;
}