View Compilation Error

0_0_37873949_31867.cpp: In function 'int main()':
0_0_37873949_31867.cpp:103:4: error: 'mid' was not declared in this scope
    mid=(l+r)>>1;
    ^
0_0_37873949_31867.cpp:104:4: error: 'midmid' was not declared in this scope
    midmid=(mid+r)>>1;
    ^