set-count

////////////////////////////////////////
//      2018/04/28 13:32:07
//      set-count

// returns the number of elements
#include <iostream>
#include <set>

using namespace std;

void print(set<int, less<int>>& s){
    set<int, less<int>>::iterator it;
    for (it = s.begin(); it != s.end(); it++){
        cout << *it << " ";
    }
    cout << endl;
}
//===========================
int main(){
    int ary[] = { 1, 2, 3, 2, 3, 4, 8, 2, 5, 6 };
    set<int, less<int>> s;

    s.insert(ary, ary + 10);
    print(s);

    cout << "cont of '2'(0 or 1) is ";
    int n = s.count(2);

    cout << n << endl;

    return 0;
}

/*
OUTPUT:
    1 2 3 4 5 6 8
    cont of '2'(0 or 1) is 1
*/