View Compilation Error

0_0_18871147_12667.cpp: In member function 'int Hungary::look()':
0_0_18871147_12667.cpp:22:39: error: 'memset' was not declared in this scope
             memset(used,0,sizeof(used));
                                       ^
0_0_18871147_12667.cpp: In member function 'void Hungary::reset()':
0_0_18871147_12667.cpp:28:31: error: 'memset' was not declared in this scope
         memset(g, 0, sizeof(g));
                               ^
0_0_18871147_12667.cpp: In function 'int main()':
0_0_18871147_12667.cpp:38:11: error: 'cin' was not declared in this scope
     while(cin >> k >> acm.nx >> acm.ny, k){
           ^
0_0_18871147_12667.cpp:42:33: error: 'scanf' was not declared in this scope
             scanf("%d%d", &a, &b);
                                 ^
0_0_18871147_12667.cpp:45:34: error: 'printf' was not declared in this scope
         printf("%d\n", acm.look());
                                  ^