View Compilation Error

0_0_26297470_12183.cpp:1:6: error: expected constructor, destructor, or type conversion before ';' token
   
      ^
0_0_26297470_12183.cpp: In function 'int main()':
0_0_26297470_12183.cpp:10:18: error: 'scanf' was not declared in this scope
     scanf("%d",&t);
                  ^
0_0_26297470_12183.cpp:25:35: error: 'printf' was not declared in this scope
         printf("Case %d: ",count++);
                                   ^
0_0_26297470_12183.cpp:26:32: error: 'puts' was not declared in this scope
         if(a[i]==n) puts("lose");
                                ^
0_0_26297470_12183.cpp:39:13: error: 'cout' was not declared in this scope
             cout<<ans<<endl;
             ^
0_0_26297470_12183.cpp:39:24: error: 'endl' was not declared in this scope
             cout<<ans<<endl;
                        ^