View Compilation Error

0_0_38050738_18963.cpp: In function 'void modify(int, int, int, int, int, int)':
0_0_38050738_18963.cpp:49:6: error: 'up' was not declared in this scope
  up(k);
      ^
0_0_38050738_18963.cpp: In function 'void ask(int, int, int, int, int)':
0_0_38050738_18963.cpp:61:6: error: 'up' was not declared in this scope
  up(k);
      ^