View Compilation Error

0_0_37652517_10540.cpp: In function 'void update(int, int, int)':
0_0_37652517_10540.cpp:158:18: error: 'u' was not declared in this scope
         pushdown(u);
                  ^
0_0_37652517_10540.cpp:160:18: error: 'l' was not declared in this scope
         if (mid>=l)
                  ^
0_0_37652517_10540.cpp:162:27: error: 'r' was not declared in this scope
             update (u*2,l,r);
                           ^
0_0_37652517_10540.cpp:164:17: error: 'r' was not declared in this scope
         if (mid<r)
                 ^
0_0_37652517_10540.cpp:166:27: error: 'l' was not declared in this scope
             update (u*2+1,l,r);
                           ^