GYM 101350L. All’s Wall That Ends Wall （ 线段树

L. All’s Wall That Ends Wall

题目描述

In the magical forest, you come upon N walls that you think is a great place to store water for your animal friends. The ith wall consists of ai blocks stacked on top of each other.

Your job is to answer queries of two types:

• For queries of the first type, print the amount of water that could be stored between all the walls.

• For queries of the second type, increase the number of blocks on the xth wall by v.

输入

The first line of input is T – the number of test cases.

The first line of each test case is integers N and Q (1 ≤ N, Q ≤ 105).

The second line contains N space-separated integers ai (1 ≤ ai ≤ 105).

The next Q lines contain either ‘P’ – denoting a query of the first type, or ‘U’ followed by x and v – denoting a query of the second type (1 ≤ x ≤ N) (1 ≤ v ≤ 104).

输出

For each test case and query of the first type, output on a line the amount of water that could be stored between the walls.

样例

inputCopy
1
6 3
2 1 4 2 1 3
P
U 1 2
P
outputCopy
4
6

题意

线段树维护即可

AC代码