View Compilation Error

0_0_16399978_31136.cpp: In function 'int main()':
0_0_16399978_31136.cpp:28:48: error: expected ')' before '{' token
                 if(beh->first-g>=(pre->first-g){
                                                ^
0_0_16399978_31136.cpp:35:13: error: expected primary-expression before '}' token
             }
             ^