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34 lines
604 B
34 lines
604 B
#include <bits/stdc++.h>
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using namespace std;
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const int N = 1010;
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int n, m;
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//结构体
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struct Node {
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int num;
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int step;
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};
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//队列中装的是结构体
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queue<Node> q;
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void bfs() {
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//形成一个数对放入队列
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q.push({n, 0});
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//套路
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while (q.size()) {
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auto x = q.front();
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q.pop();
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if (x.num == m) {
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printf("%d", x.step);
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break;
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}
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q.push({x.num + 1, x.step + 1});
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q.push({x.num - 1, x.step + 1});
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q.push({x.num * 2, x.step + 1});
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}
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}
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int main() {
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cin >> n >> m;
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bfs();
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return 0;
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} |