View Compilation Error

0_0_17131017_434.cpp: In function 'void init()':
0_0_17131017_434.cpp:12:25: error: 'memset' was not declared in this scope
     memset(f,0,sizeof(f));
                         ^
0_0_17131017_434.cpp: In function 'int main()':
0_0_17131017_434.cpp:23:24: error: 'scanf' was not declared in this scope
     while(scanf("%d",&n)!=EOF&&n)
                        ^
0_0_17131017_434.cpp:23:27: error: 'EOF' was not declared in this scope
     while(scanf("%d",&n)!=EOF&&n)
                           ^
0_0_17131017_434.cpp:25:29: error: 'memset' was not declared in this scope
         memset(b,0,sizeof(b));
                             ^
0_0_17131017_434.cpp:51:31: error: 'printf' was not declared in this scope
             if(k!=1)printf(" ");
                               ^
0_0_17131017_434.cpp:52:30: error: 'printf' was not declared in this scope
             printf("%lld",sum);
                              ^
0_0_17131017_434.cpp:54:20: error: 'printf' was not declared in this scope
         printf("\n");
                    ^