std::vector<int> a;
int p;
int N;
// ...
p = a[ N>>1 ];
What is the N>>1 part?
std::vector<int> a; int p; int N; // … p = a[ N>>1 ]; What
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Divides N by 2 (by bit shifting right 1) and using that as the index into the vector a to assign p.