View Compilation Error

0_0_27365093_1968.cpp: In function 'int main()':
0_0_27365093_1968.cpp:47:12: error: 'pl' was not declared in this scope
         if(pl)
            ^
0_0_27365093_1968.cpp:48:40: error: 'nl' was not declared in this scope
             printf("Case #%d: Yes\n",++nl);
                                        ^
0_0_27365093_1968.cpp:50:39: error: 'nl' was not declared in this scope
             printf("Case #%d: No\n",++nl);
                                       ^