View Compilation Error

0_0_23145098_13580.cpp: In function 'void pushDown(int, int)':
0_0_23145098_13580.cpp:34:33: error: 'r' was not declared in this scope
         sum[ls[o]] += add[o] * (r-l/2);
                                 ^
0_0_23145098_13580.cpp:34:35: error: 'l' was not declared in this scope
         sum[ls[o]] += add[o] * (r-l/2);
                                   ^