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//http://www.cnblogs.com/iwtwiioi/p/4985747.html
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#include <cstdio>
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int main()
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{
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int p, q;
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scanf("%d%d", &p, &q);
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printf("%lld", 1ll * (q - 1) * (p - 1) / 4 + (p == q) * (q - 1) / 2);
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return 0;
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} |
