View Compilation Error

0_0_30391666_4197.cpp: In function 'll solve(int, int)':
0_0_30391666_4197.cpp:14:5: error: expected ';' before 'res'
  ll res=0;
     ^
0_0_30391666_4197.cpp:17:3: error: 'res' was not declared in this scope
   res=(x-r+1)/2;
   ^
0_0_30391666_4197.cpp:31:3: error: 'res' was not declared in this scope
   res=(l-y+1)/2;
   ^