View Compilation Error

0_0_24133345_22739.cpp: In function 'int Read()':
0_0_24133345_22739.cpp:24:17: error: 'getchar' was not declared in this scope
    ch = getchar();
                 ^
0_0_24133345_22739.cpp: In function 'int solve(int, int, int)':
0_0_24133345_22739.cpp:54:34: error: 'memset' was not declared in this scope
         memset(vis,-1,sizeof(vis));
                                  ^
0_0_24133345_22739.cpp: In function 'int main()':
0_0_24133345_22739.cpp:88:40: error: 'scanf' was not declared in this scope
     while (scanf("%d%d%d%d",&n,&X,&Y,&Z)==4) {
                                        ^
0_0_24133345_22739.cpp:108:26: error: 'printf' was not declared in this scope
         printf("%d\n",ans);
                          ^