View Compilation Error

0_0_18450878_31185.cpp: In function 'int main()':
0_0_18450878_31185.cpp:105:19: error: 'mid' was not declared in this scope
             while(mid + eps < mmid)
                   ^
0_0_18450878_31185.cpp:105:31: error: 'mmid' was not declared in this scope
             while(mid + eps < mmid)
                               ^