View Compilation Error

0_0_36224842_24310.cpp: In function 'void dfs(int, int, long long int)':
0_0_36224842_24310.cpp:126:50: error: invalid initialization of reference of type 'int&' from expression of type 'const int'
     while( R>1 and Bad(Hull[R-1],Hull[R],mine,DSC)){
                                                  ^
0_0_36224842_24310.cpp:94:13: note: in passing argument 4 of 'bool Bad(Line&, Line&, Line&, int&)'
 inline bool Bad(Line &P,Line &C,Line &N,int &flag){
             ^