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.
# | User | Rating |
---|---|---|
1 | tourist | 4009 |
2 | jiangly | 3773 |
3 | Radewoosh | 3646 |
4 | ecnerwala | 3624 |
5 | jqdai0815 | 3620 |
5 | Benq | 3620 |
7 | orzdevinwang | 3612 |
8 | Geothermal | 3569 |
8 | cnnfls_csy | 3569 |
10 | gyh20 | 3447 |
# | User | Contrib. |
---|---|---|
1 | awoo | 161 |
2 | maomao90 | 160 |
3 | nor | 157 |
4 | atcoder_official | 156 |
4 | cry | 156 |
6 | -is-this-fft- | 155 |
7 | maroonrk | 154 |
8 | adamant | 153 |
9 | Um_nik | 151 |
10 | djm03178 | 146 |
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.
Name |
---|
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..