View Compilation Error

0_0_22389983_6612.cpp:101:9: error: stray '\' in program
         printf("%.2lf\n", Closest_pair(0, n-1)\2);
         ^
0_0_22389983_6612.cpp: In function 'int main()':
0_0_22389983_6612.cpp:101:48: error: expected ')' before numeric constant
         printf("%.2lf\n", Closest_pair(0, n-1)\2);
                                                ^