View Compilation Error

0_0_30471015_28866.cpp: In function 'int get_k(int, int, int)':
0_0_30471015_28866.cpp:78:13: error: expected ')' before 'R'
             R = mid;
             ^
0_0_30471015_28866.cpp:78:20: error: expected ')' before ';' token
             R = mid;
                    ^