STL set 컨테이너의 키 설정 문의 드립니다.

#include <cstdio>
#include <set>
 
using namespace std ;
 
#define ARRAY_ROW  2
#define ARRAY_COL  3
 
typedef int (Array)[ARRAY_ROW][ARRAY_COL] ;
 
struct Data
{
        static int row ;
        static int col ;
 
        Array array ;
};
 
int Data::row = ARRAY_ROW ;
int Data::col = ARRAY_COL ;
 
struct DataCompare
{
        bool operator() (const Data& lhs, const Data& rhs) const
        {
//             memcmp를 쓰면 안된다. 음수값의 비교가 안된다.
//             int ret = memcmp(&lhs.array, &rhs.array, sizeof(lhs.array)) ;
 
                for(int ii = 0; ii < lhs.row; ii++)
                {
                        for(int jj = 0; jj < lhs.col; jj++)
                        {
                                if( lhs.array[ii][jj] < rhs.array[ii][jj])
                                        return 1 ;
                                else if( lhs.array[ii][jj] > rhs.array[ii][jj])
                                        return 0 ;
                        }
                }
                return 0 ;
        }
};
 
int main()
{
        set<Data, DataCompare>      setData ;
        set<Data, DataCompare>::const_iterator  setDataIter ;
 
        Data data1 = {{{8,7,0}, {8,1,3}}};
        setData.insert(data1) ;
        Data data2 = {{{2,3,4}, {4,5,7}}};
        setData.insert(data2) ;
        Data data3 = {{{2,3,4}, {4,5,6}}};
        setData.insert(data3) ;
        Data data4 = {{{-1,3,4}, {4,-1,6}}};
        setData.insert(data4) ;
        Data data5 = {{{2,3,4}, {4,5,6}}};
        setData.insert(data5) ;
        Data data6 = {{{-1,3,4}, {4,1,6}}};
        setData.insert(data6) ;
 
        setDataIter = setData.begin() ;
        for(; setDataIter != setData.end(); setDataIter++)
        {
                printf("================\n") ;
                for(int ii = 0; ii < 2; ii++)
                {
                        for(int jj = 0; jj < 3; jj++)
                                printf("%d ", setDataIter->array[ii][jj]) ;
                        printf("\n") ;
                }
        }
 
        Data data7 = {{{-1,3,4}, {4,-1,6}}};
 
        setDataIter = setData.find(data7) ;
        if(setDataIter != setData.end())
        {
                printf("find~!!\n") ;
        }
 
        Data data8 = {{{0,0,4}, {4,-1,6}}};
 
        setDataIter = setData.find(data8) ;
        if(setDataIter == setData.end())
        {
                printf("cannot Find~!!\n") ;
        }
 
        return 1 ;
}