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