View Compilation Error

0_0_32865075_21245.cpp: In function 'void Mdebug(Matrix)':
0_0_32865075_21245.cpp:17:39: error: 'printf' was not declared in this scope
                 printf("%d", a.m[i][j]);
                                       ^
0_0_32865075_21245.cpp:18:16: error: 'puts' was not declared in this scope
         puts("");
                ^
0_0_32865075_21245.cpp: In function 'void init()':
0_0_32865075_21245.cpp:41:15: error: 'clean' was not declared in this scope
     clean(A, 0);
               ^
0_0_32865075_21245.cpp: In function 'int main()':
0_0_32865075_21245.cpp:75:30: error: 'scanf' was not declared in this scope
     int cas; scanf("%d", &cas);
                              ^
0_0_32865075_21245.cpp:79:24: error: 'clean' was not declared in this scope
         clean(ans[0], 0);
                        ^
0_0_32865075_21245.cpp:95:48: error: 'printf' was not declared in this scope
         printf("Case %d: %I64d\n", I, ans[t][0]);
                                                ^