View Compilation Error

0_0_35858212_30858.cpp: In function 'int main()':
0_0_35858212_30858.cpp:32:13: error: redeclaration of 'long long int res'
   long long res = 2e18;
             ^
0_0_35858212_30858.cpp:19:13: note: 'long long int res' previously declared here
   long long res = 2e18;
             ^