glad that i understand the problem writes the 150 lines code by me fully in 1 hr just a glag value remains that why not completed but question was craxy and experience is mind blowing

Q.Statment(rough): we have given three vector of string named transaction,ruleList and merchant

the format of each of three string vector like
transaction:comma separated merchant,amount,customer,time; // time is in hr from 0 to 23
ruleList:comma separated min_threshold,*factor,+factor,penalty;
merchantList: comma separated merchant name and merchant base score .

so basically we have to return a vector of string fraud_score for each merchant exist in merchant_list the output string format is comma seprated <merchant,fraudscorre>

keep initial fraud score = curr score of merchants by merchant_List;

Rules:
1 --> if (amount > min_threshold) then currfact should multipley by multiplicative factor

2 --> if(the transaction between merchant and customer >=3)
then on third transition add additive for 1st and second
and on >3 add curr additve factor(+factor);

3 --> if(the transaction between merchant and customer >=3 in the same hour )
if(hr is betwwen 12 to 17 inclusive }
for 3 rd transaction ->add penalty for 1st and second transaction
for >3 transaction add their penalty in curr score;

if(hr is betwwen 9 to 11 or 18 to 21 )
subtract current penalty from curr score

my approach

stuff used and for

1 maps

• map<pair<string,string>,int> for saving 1st and second transaction additive factor

-map<pairpair<string,string>,int>,int> for for saving 1st and second transaction penalty hour wise ;
mp[{{merchant,customer},hr}]+=penalty;

• map<pairpair<string,string>,int>,int> for for saving freq of hour wise ;
  mp[{{merchant,customer},hr}]++;

• map<string,int> for saving and updating merchants score....

-map<{string,string},int> for counting frequency

simple logic used

for (int i=0;i<n;i++)
{
extracted all things by stringstream with ',' separated;
updated logic

}

so for curr=1 we have to add the additive and penalty so for this i used to flag f1 and f2 where if f1=0 it mean 1 or 2 and second freq is coming add additive and penalty

so for curr=2 we have to add the additive and penalty so for this i used to flag f1 and f2 where if f1=0 it mean 1 or 2 and second freq is coming add additive and penalty and then make both flags 1

if curr>=3 and flag then condition written

everything is perfect i didnt updated the f2 only .