vidyavnv

from pymongo import MongoClient
from bson.code import Code

client = MongoClient()
db = client["dbname"]

col = db["collName"]

map = Code("function(){ if(this.fieldName){emit(this.fieldName,1);}}")
reduce = Code("function(key,values) {"

vidyavnv

/*Bill Gates is on one of his philanthropic journeys to a village in Utopia. He has N packets of candies and 
would like to distribute one packet to each of the K children in the village (each packet may contain 
different number of candies). To avoid a fight between the children, he would like to pick K out of N packets 
such that the unfairness is minimized.

Suppose the K packets have (x1, x2, x3,….xk) candies in them, where xi denotes the number of candies in the 
ith packet, then we define unfairness as

Sum [abs(X(i) - X(j))]    1<=i<j<=N