0_0_22945072_27890.cpp: In function 'void sub(int, int, int)':
0_0_22945072_27890.cpp:27:8: error: 'a' was not declared in this scope
if(a>(t[num].l+t[num].r)/2)
^
0_0_22945072_27890.cpp: In function 'void add(int, int, int)':
0_0_22945072_27890.cpp:37:8: error: 'a' was not declared in this scope
if(a>(t[num].l+t[num].r)/2)
^
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