View Compilation Error

0_0_34442060_9894.cpp: In function 'int main()':
0_0_34442060_9894.cpp:9:22: error: 'scanf' was not declared in this scope
  while(~scanf("%d",&t))
                      ^
0_0_34442060_9894.cpp:13:11: error: 'a' was not declared in this scope
    memset(a,0,sizeof(a));
           ^
0_0_34442060_9894.cpp:13:24: error: 'memset' was not declared in this scope
    memset(a,0,sizeof(a));
                        ^
0_0_34442060_9894.cpp:18:23: error: 'r' was not declared in this scope
     scanf("%d %d %c",&r[i].x,&r[i].y,&str[0]);
                       ^
0_0_34442060_9894.cpp:36:14: error: 'r' was not declared in this scope
     case 'L':r[wu1[i]-1].m=(wu2[i]+r[wu1[i]-1].m)%4;break;
              ^
0_0_34442060_9894.cpp:97:17: error: 'printf' was not declared in this scope
    printf("OK\n");continue;
                 ^