problem MEXUM(problem_link)
My sol(sol_link) is giving WA. I could not figure out, why is this happening. Someone please help me find out the error.
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problem MEXUM(problem_link)
My sol(sol_link) is giving WA. I could not figure out, why is this happening. Someone please help me find out the error.
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Auto comment: topic has been updated by manoj9april (previous revision, new revision, compare).
In your code, I found these three lines will get overflow.
line 111 -> ans = (ans + (i*(mul*po2[n-sum])%mod)%mod )%mod;
line 114 -> ans = (ans + (i*(mul*po2[n-sum])%mod)%mod )%mod;
line 119 -> mul = (mul * (po2[fre[i]]-1+mod)%mod)%mod;
I changed these three lines as follow and got AC:
line 111 -> ans = (ans + (i*((mul*po2[n-sum])%mod))%mod )%mod;
line 114 -> ans = (ans + (i*((mul*po2[n-sum])%mod))%mod )%mod;
line 119 -> mul = (mul * ((po2[fre[i]]-1+mod)%mod))%mod;
(a*(b*c)%mod)%mod is equivalent to (a*b*c)%mod. Sorry for my bad English, Hope this will help you in the future.
your modified code solution link: https://www.codechef.com/viewsolution/32300055
Thanks man...i got my mistake..