Three Sequences

2000ms

524288K

Description:

You are given a sequence of $$$n$$$ integers $$$a_1, a_2, \ldots, a_n$$$.

You have to construct two sequences of integers $$$b$$$ and $$$c$$$ with length $$$n$$$ that satisfy:

for every $$$i$$$ ($$$1\leq i\leq n$$$) $$$b_i+c_i=a_i$$$
$$$b$$$ is non-decreasing, which means that for every $$$1<i\leq n$$$, $$$b_i\geq b_{i-1}$$$ must hold
$$$c$$$ is non-increasing, which means that for every $$$1<i\leq n$$$, $$$c_i\leq c_{i-1}$$$ must hold

You have to minimize $$$\max(b_i,c_i)$$$. In other words, you have to minimize the maximum number in sequences $$$b$$$ and $$$c$$$.

Also there will be $$$q$$$ changes, the $$$i$$$-th change is described by three integers $$$l,r,x$$$. You should add $$$x$$$ to $$$a_l,a_{l+1}, \ldots, a_r$$$.

You have to find the minimum possible value of $$$\max(b_i,c_i)$$$ for the initial sequence and for sequence after each change.

Input:

The first line contains an integer $$$n$$$ ($$$1\leq n\leq 10^5$$$).

The secound line contains $$$n$$$ integers $$$a_1,a_2,\ldots,a_n$$$ ($$$1\leq i\leq n$$$, $$$-10^9\leq a_i\leq 10^9$$$).

The third line contains an integer $$$q$$$ ($$$1\leq q\leq 10^5$$$).

Each of the next $$$q$$$ lines contains three integers $$$l,r,x$$$ ($$$1\leq l\leq r\leq n,-10^9\leq x\leq 10^9$$$), desribing the next change.

Output:

Print $$$q+1$$$ lines.

On the $$$i$$$-th ($$$1 \leq i \leq q+1$$$) line, print the answer to the problem for the sequence after $$$i-1$$$ changes.

Sample Input:

Sample Output:

5
5
6

Sample Input:

6
-9 -10 -9 -6 -5 4
3
2 6 -9
1 2 -10
4 6 -3

Sample Output:

Sample Input:

Sample Output:

0
0
-1

Note:

In the first test:

The initial sequence $$$a = (2, -1, 7, 3)$$$. Two sequences $$$b=(-3,-3,5,5),c=(5,2,2,-2)$$$ is a possible choice.
After the first change $$$a = (2, -4, 4, 0)$$$. Two sequences $$$b=(-3,-3,5,5),c=(5,-1,-1,-5)$$$ is a possible choice.
After the second change $$$a = (2, -4, 6, 2)$$$. Two sequences $$$b=(-4,-4,6,6),c=(6,0,0,-4)$$$ is a possible choice.

Informação

Provedor Codeforces

Código CF1406D