Greedy_coin_change

#1

I am unable to understand coin change solution. What i am getting through int idx = upper_bound.

I am not sure about coins , coins+n, money)-1 -coins.

#2

@Ans
Hello Arun,
upper_bound(coins,coins+n,money)-coins -> this is returning us index in array whose value is just greater than money.
now when we do -1 to above index it will give the index whose value will be either equal to or less than money.

#3

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