Hi in problem B of last contest the answer is ∑(pi−ai)+max(pi−ai) now I don't get the max(pi−ai) part I know what it's but I don't know how did we derive it can someone help ?
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for adding 1 to the k elements you select need to add k+1 to your score right, so the number of turns of selecting k elements is basically the max element difference , so for each turn u spend 1 extra so the number of turns are max(pi-ai) so hence its max(pi-ai) extra
ok thanks, It clicked after reading the comment for several times the problem is that I did it with a completely different approach so it was hard for me to understand this
Maths