made it shorter
unsigned long long div2(unsigned long long a){ unsigned long long ans{}; while (ans + ans + 1 < a) ans++; return ans; }- unsigned long long div2(unsigned long long a){
unsigned long long ans = 0, i;for (i = 1; i <= a; i++) {if (i % 2){continue;} else {ans++;}}- unsigned long long ans{};
- while (ans + ans + 1 < a) ans++;
- return ans;
- }