开始计概A下半学期。

cs101/2025mid/exam_2025mid_07_op.cpp

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+#include <cmath>
+#include <iostream>
+
+long long calc_min_ops(long long a, long long b) {
+    if (a > b) { return a - b; }
+    long long div = b / a;
+    auto multiply_times = static_cast<long long>(std::log2(div));
+    a = a * std::pow(2, multiply_times);
+    return std::min(multiply_times + b - a, multiply_times + 1 + (2 * a - b));
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+    long long a, b;
+    std::cin >> a >> b;
+    std::cout << calc_min_ops(a, b) << std::endl;
+
+    return 0;
+}