View Compilation Error

0_0_23137092_24192.cpp: In function 'int main()':
0_0_23137092_24192.cpp:5:18: error: 'scanf' was not declared in this scope
     scanf("%d",&n);
                  ^
0_0_23137092_24192.cpp:16:32: error: 'printf' was not declared in this scope
         printf("%d\n",step[m-1]);
                                ^