/in/foo.cc: In function 'int LCA(int, int)':
/in/foo.cc:58:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(i=0;i<=18;i++)
  ^~~
/in/foo.cc:60:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   if(x==y) return x;
   ^~
/in/foo.cc:61:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(i=18;i>=0;i--)
  ^~~
/in/foo.cc:65:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   if(x==y) return x;
   ^~
/in/foo.cc: In function 'int UP(int, int)':
/in/foo.cc:70:8: warning: unused variable 'k' [-Wunused-variable]
  int i,k;
        ^
/in/foo.cc: In function 'void Solve2(int, int, int)':
/in/foo.cc:99:8: warning: unused variable 'k' [-Wunused-variable]
  int i,k,j;
        ^
/in/foo.cc:99:10: warning: unused variable 'j' [-Wunused-variable]
  int i,k,j;
          ^