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Baqer Ali

AI agent developer |... • 2d

Sometimes we think it will work but it doesn't Today I was revising my lecture which covered Modular arithmetic If you are a competitive programmer then you know if we want to perform arithmetic operations In really large numbers Like a really really large number Numbers greater than 10**18 which will over flow int and long long data types To over some this we use MOD MOD works fine with addition multiplication and subtraction. But we have a problem with devision Assume we have two numbers A and B (A and B > 10**18) we can't divide these numbers directly If we use MOD on each number then the ans will change Initially it is possible like A and B are divisible but after MOD operation A and B are not divisible and this will give us the wrong answer To fix this issue we use the concept of inverse Still I don't understand it fully but I know this A / B % MOD == A * B^-1 % MOD Like it somehow works

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