Helping

Over the last 40 years, China has experienced the fastest economic growth anywhere but also paid a heavy environmental price. China has many of the wo ......

给出一个长度为 n 的序列 a，每次可以进行三种操作中的一种： 选择 i，将 1,2,⋯ ,a1​,a2​,⋯,ai​ 减 1。 选择 i，将 ,+1,⋯ ,ai​,ai+1​,⋯,an​ 减 1。 将所有 ai​ 加 1。 求最少需要多少次操作将所有 ai​ 变为 0。 1≤2×1041≤T≤2× ......