View Compilation Error

0_0_32863268_8266.cpp: In function 'int main()':
0_0_32863268_8266.cpp:76:30: error: 'scanf' was not declared in this scope
     while(~scanf("%d%d",&m,&n))
                              ^
0_0_32863268_8266.cpp:78:34: error: 'memset' was not declared in this scope
         memset(sec,-1,sizeof(sec));
                                  ^
0_0_32863268_8266.cpp:82:17: error: 'getchar' was not declared in this scope
         getchar();
                 ^
0_0_32863268_8266.cpp:95:54: error: 'printf' was not declared in this scope
             printf("God please help our poor hero.\n");
                                                      ^
0_0_32863268_8266.cpp:100:110: error: 'printf' was not declared in this scope
             printf("It takes %d seconds to reach the target position, let me show you the way.\n",sec[m][n]-1);
                                                                                                              ^