View Compilation Error

0_0_19216549_30484.cpp: In function 'int main()':
0_0_19216549_30484.cpp:38:29: error: 'scanf' was not declared in this scope
  while(scanf("%d%d",&n,&need)!=-1)
                             ^
0_0_19216549_30484.cpp:54:52: error: 'printf' was not declared in this scope
   if(flag) {printf("The zombies eat your brains!\n");continue;}
                                                    ^
0_0_19216549_30484.cpp:56:51: error: 'printf' was not declared in this scope
   for(i=1;i<=n;i++) if(match[i]==1) {printf("%d",i);break;}
                                                   ^
0_0_19216549_30484.cpp:59:35: error: 'printf' was not declared in this scope
    if(match[l]==i) {printf(" %d",l);break;}
                                   ^
0_0_19216549_30484.cpp:60:14: error: 'printf' was not declared in this scope
   printf("\n");
              ^