View Compilation Error

0_0_35759727_31548.cpp: In function 'mat mul(mat, mat)':
0_0_35759727_31548.cpp:12:31: error: 'memset' was not declared in this scope
     memset(r.a, 0, sizeof(r.a));
                               ^
0_0_35759727_31548.cpp: In function 'mat pow(mat, int)':
0_0_35759727_31548.cpp:31:31: error: 'memset' was not declared in this scope
     memset(b.a, 0, sizeof(b.a));
                               ^
0_0_35759727_31548.cpp: In function 'int main()':
0_0_35759727_31548.cpp:45:32: error: 'scanf' was not declared in this scope
     while(~scanf("%d%d", &n, &k)&& n+k ){
                                ^
0_0_35759727_31548.cpp:57:35: error: 'memset' was not declared in this scope
         memset(A.a, 0, sizeof(A.a));
                                   ^
0_0_35759727_31548.cpp:87:27: error: 'printf' was not declared in this scope
         printf("%d\n", sum);
                           ^