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Long Long Mod Mul
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| using ull = unsigned long long; | |
| ull _mod_mul(ull a,ull b,ull m){ | |
| a%=m,b%=m; | |
| ull ans=0; | |
| for(;b;b>>=1){ | |
| if(b&1){ | |
| ans+=a; | |
| if(ans>=m)ans-=m; | |
| } | |
| a<<=1; | |
| if(a>=m)a-=m; | |
| } | |
| if(ans>=m)ans-=m; | |
| else if(ans<0)ans+=m; | |
| return ans; | |
| } |
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