histograma

#include <iostream>

int main() {

    unsigned short N, M, P;

    while(1) {

        std::cin >> N >> M;
        if(N == 0 && M ==0) break;

        std::cin >> P;

        unsigned short matrix[N][M], counter[++P];

        for(unsigned short i=0; i<N; i++) {
            for(unsigned short j=0; j<M; j++)
                std::cin >> matrix[i][j];


        }

        for(unsigned short i=0; i<P; i++) {
            counter[i] = 0;

            for(unsigned short j=0; j<N; j++){
                for(unsigned short k=0; k<M; k++)
                    if(matrix[j][k] == i) counter[i]++;
            }

            std::cout << i << ":" << counter[i] << " ";
        }
        std::cout << "\n";
    }

    return 0;
}