0_0_28898387_16128.cpp: In function 'void update(int, int, int, int, int)':
0_0_28898387_16128.cpp:24:32: error: 'f' was not declared in this scope
update(k * 2,l,mid,L,R,f);
^
0_0_28898387_16128.cpp:27:40: error: 'f' was not declared in this scope
update(k * 2 + 1,mid + 1,r,L,R,f);
^
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