set C++容器

    // 举例如下:
    int a[] = {1,2,3,4,5,6,7,8,1,2};
    int nSize = sizeof(a)/sizeof(a[0]);
    using namespace std;
    set<int> sint;
    for(int i=0; i<nSize; ++i)
    {
        pair<set<int>::iterator,bool> result = sint.insert(i);
        if(result.second == false) // 插入的值重复,返回false
        {
            // do something
        }
    }