what is wrong submission but passed↵
[306759678](https://mirror.codeforces.com/contest/2069/submission/306759678)↵
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this is the changed one and passed which i think is correct↵
[309488880](https://mirror.codeforces.com/contest/2069/submission/309488880)↵
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ask gives hash of string from l to r↵
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whats wrong : inv[i] gives modular inverse of factorial of i↵
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whats correct : inv[i] should be modular inverse of power of i base prime (P)↵
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↵
↵
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why i think this has happened : maybe due to combined probability of binary search, unsufficient tests, and bunch of luck i manage to AC the problem XD
[306759678](https://mirror.codeforces.com/contest/2069/submission/306759678)↵
↵
this is the changed one and passed which i think is correct↵
[309488880](https://mirror.codeforces.com/contest/2069/submission/309488880)↵
↵
↵
ask gives hash of string from l to r↵
↵
whats wrong : inv[i] gives modular inverse of factorial of i↵
↵
whats correct : inv[i] should be modular inverse of power of i base prime (P)↵
↵
↵
↵
↵
↵
why i think this has happened : maybe due to combined probability of binary search, unsufficient tests, and bunch of luck i manage to AC the problem XD
