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Wendy and Bob Game winner Jp morgan solution

 

#include<bits/stdc++.h>
using namespace std;

int power(int base , int expo)
{
    if(expo ==0)
    {
        return 1;
    }
    if(expo == 1)
    {
        return base;
    }
    int x = power(base , expo/2);
    if(expo%2 ==0)
    {
        return x*x;
    }
    else
    {
        return x*x*base;
    }
}
int find_pattern(string pattern , string &s)
{
    int pattern_hash =0;
    int base =31;
    int mod = 1e9 +7;
    int cnt_occurances =0;
    unordered_map<char, int>map;
    map['w'] = 2;
    map['b'] = 1;
    for(int i =0 ; i < pattern.length(); i++)
    {  
        int t = map[pattern[i]];
        pattern_hash = (pattern_hash + t*power(base , i)) %mod;
    }
    int substring_hash = (map[s[0]]*power(base , 0)  +map[s[1]]*power(base , 1) + map[s[2]]*power(base , 2 ))%mod;
    if(substring_hash == pattern_hash)
    {
       cnt_occurances++;
    }
    for(int i =3 ; i < s.length() ; i++)
    {
       
    substring_hash = (substring_hash/base - map[s[i-2]] + map[s[i]]*power(base, 2)%mod)%mod;
   
    if(substring_hash == pattern_hash)
    {
        cnt_occurances++;
    }
       
       
    }
    return cnt_occurances;
}
bool solve(string &s)
{
    int cnt_wendy = find_pattern("www", s);
    int cnt_bob = find_pattern("bbb" , s );
    return cnt_wendy > cnt_bob ? true : false;
  
}
int main()
{
    string s = "wwwbbbww";
   
    string p = solve(s) == true ? "wendy" : "bob";
    cout << p;
   
}

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