View Compilation Error

0_0_17329966_190.cpp: In function 'int find(int)':
0_0_17329966_190.cpp:34:12: error: 'pre' was not declared in this scope
     return pre[a]=(pre[a]==a?a:find(pre[a]));
            ^
0_0_17329966_190.cpp: In function 'int main()':
0_0_17329966_190.cpp:92:7: error: expected primary-expression before '%' token
      }%0
       ^
0_0_17329966_190.cpp:92:8: error: expected '}' at end of input
      }%0
        ^