View Compilation Error

0_0_29966228_10405.cpp:53:36: error: expected ',' or '...' before '%' token
 bool cmp2(const node &a,const node %2
                                    ^
0_0_29966228_10405.cpp:53:37: error: expected ')' at end of input
 bool cmp2(const node &a,const node %2
                                     ^
0_0_29966228_10405.cpp:53:37: error: expected initializer at end of input