Why we did -1 in the main logic line when we have used comparator function definition ,that is -
int lb = lower_bound( coins,coins+n,money, compare)
-coins. -1;
Money change problem
this is because if you just use
lower_bound(coins,coins+n,money,compare)-coins;
it is always greater than money (we made it so by passing compare function)
hence we have to decrease 1 from it
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