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#include <iostream> #include <vector> #include <algorithm> #include <map> using namespace std; typedef long long ll; int main() { ios_base::sync_with_stdio(false); ll N, S; cin >> S >> N; ll cnt = 0; while(N >= 2 * S) { if(N == S + 2) { N = S; } else if(N % 2 == 1) { N--; } else { N /= 2; } cnt++; } cout << cnt + (N - S + 1) / 2 << endl; return 0; } // 99123959998
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