EXL

_    [a-z]  [0-9]  [=]  ¬
s0    s1     s2    ok  end
s1    s1     s1    ok  ok
s2    ok     s2    ok  ok

_       in == ['a'-'z']                     in == ['0'-'9']                    in == ['=']           ¬
s0    val := in; next; s1                 val := in-'0'; next; s2            next; ret(ASSIGN)  ret(EOT)
s1    val := concat(val, in); next; s1    val := concat(val, in); next; s1   ret(IDENT, val)    ret(IDENT, val)
s2    ret(INTEGER, val)                   val := val*10+in-'0'; next; s2     ret(INTEGER, val)  ret(INTEGER, val)

s0 ('a') -> val := 'a'; next; s1
s1 ('1') -> val := 'a1'; next; s1
s1 ('=') -> ret(IDENT, 'a1')

s0 ('9') -> val := 9; next; s2
s2 ('5') -> val := 95; next; s2
s2 (¬) -> ret(INTEGER, 95)

#include <iostream>
#include <vector>
#include <climits>
#include <map>
#include <ctime>

class MyMatrixInt {
public:
    MyMatrixInt(size_t rows = 1, size_t cols = 1, int range = 1)
    {
        reFill(rows, cols, range);
    }

    void reFill(size_t rows = 1, size_t cols = 1, int range = 1)
    {
        data_.clear();
        for (size_t i = 0; i < rows; ++i) {
            std::vector<int> row;
            for (size_t j = 0; j < cols; ++j) {
                row.push_back(rand() % range);
            }
            data_.push_back(row);
        }
    }

    int maxUniqueElem() const
    {
        int max_elem = INT_MIN;

        std::map<int, int> elem_map;

        for (size_t i = 0; i < data_.size(); i++) {
            for (size_t j = 0; j < data_[i].size(); j++) {
                elem_map[data_[i][j]]++;
            }
        }

        std::map<int, int>::reverse_iterator rit;
        for (rit = elem_map.rbegin(); rit != elem_map.rend(); ++rit) {
            if (rit->second == 1) {
                max_elem = rit->first;
                break;
            }
        }

        return max_elem;
    }

    void print() const
    {
        for (size_t i = 0; i < data_.size(); ++i) {
            for (size_t j = 0; j < data_[0].size(); j++) {
                std::cout << data_[i][j] << "\t";
            }
            std::cout << std::endl;
        }
    }


private:
    std::vector<std::vector<int> > data_;
};


int main()
{
    MyMatrixInt my_mat;

    //srand(time(NULL));
    my_mat.reFill(5, 5, 10); // Fill 2D 5x5 Matrix
    my_mat.print();

    int max = my_mat.maxUniqueElem();

    if (max != INT_MIN) {
        std::cout << "\nMax element is: " << max << std::endl;
    }
    else {
        std::cout << "\nMax element in matrix isn't found!" << std::endl;
    }

    return 0;
}

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