update
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@ -14,7 +14,7 @@ static ull fact(const ull n)noexcept{
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if(it != fact_map.end())return (*it).second;
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ull ret {1};
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for(ull i{2};i<=n;i++){
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ret=(ret*i)%k;
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ret=(ret%k*i%k);
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}
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fact_map.insert({n,ret});
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return ret;
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