Hello Everyone! I have made a video tutorial on how we can compare substrings in constant time using string hashing in C++. I have taken the problem from Codechef May CookOff "Chef Chefina and their friendship" which can be solved using hashing. Check it outhere Thank You!
I have tried to explain string hashing using a few example problems for beginners. Check it out the post here:http://threads-iiith.quora.com/String-Hashing-for-competitive-programming PS: The content in the post may seem quite naive to experienced coders :)...
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static void rehash_table(); static bool needs_rehashing() { return _needs_rehashing; } static inline void update_needs_rehash(bool rehash) { if (rehash) { _needs_rehashing = true; } } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21...
In some contest, there is some string related problem. Many authors use hashing algorithm to make the solution faster. When string length is so small that hash value does not overflow, then I have no question. But when string length is too big to hash value is over flow, then how soluti...
Actually once I had a problem in Codeforces using 2^64 as mod, but then I changed the base 33 to 77 and got AC. → Reply dalex 11 years ago, # ^ | +1 It DOESN'T depend on what number you use as a base. → Reply ...
String Hashing http://codeforces.com/problemset/problem/514/C Code http://codeforces.com/contest/159/problem/D Code Aho-corasick https://www.codechef.com/problems/LYRC https://www.codechef.com/JULY12/problems/FAVNUM https://www.codechef.com/LTIME06/problems/QMARKSstrings...
I have tried to find answers on Google and the best I could find isthis problem from HackerEarth. The suggested solutions were either hashing with binary search, or suffix tree. And I am not knowledgeable enough to transform the problem into the original problem. So far the best I could ha...
Can anyone please tell me which one is faster among those two ( map<const char * ,int> or map<string,int> ) ? BUTyou should be careful using it map<constchar*,int>T;intmain(){T["abc"]=1;cout<<T["abc"];} map<constchar*,int>T;intmain(){chartemp[]="abc";T[temp]=1;cou...
You are given a binary string (consisting of 0,1) and you can rotate the string in any order. Basically if the string is s1s2s3...s(n-1)s(n) , you can make it s2s3s4,,,s(n-1)s(n)s1 . Print out the rotation which has the maximum value in binary representation. ...