View Compilation Error

0_0_13431733_10336.cpp: In function 'double solve(int, int)':
0_0_13431733_10336.cpp:48:7: error: 'i' was not declared in this scope
  for( i=l+n/2;i<=r&&(a[i].x-mid)<dmin;i++){
       ^
0_0_13431733_10336.cpp:52:6: error: 'i' was not declared in this scope
  for(i=0;i<c;i++){
      ^