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TangDou/LanQiaoBei/LanQiaoBei13ShengSai_ZJ_I/BC3.cpp
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13
TangDou/LanQiaoBei/LanQiaoBei13ShengSai_ZJ_I/BC3.cpp
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#include <bits/stdc++.h>
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using namespace std;
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// https://blog.csdn.net/gl620321/article/details/104907041/
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/*
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通过找规律可以得到,如果(p, q)=d=1(互质), 最大的凑不出来的数是a*b-a-b.
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这个可以看作是一个定理
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*/
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int main() {
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int a, b;
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cin >> a >> b;
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cout << a * b - a - b << endl;
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return 0;
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}
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