- Time limit: 1.00 s
- Memory limit: 512 MB
Given an array of n integers, you have to process following operations:
- reverse a subarray
- calculate the sum of values in a subarray
The first input line has two integers n and m: the size of the array and the number of operations. The array elements are numbered 1,2,\dots,n.
The next line as n integers x_1,x_2,\dots,x_n: the contents of the array.
Finally, there are m lines that describe the operations. Each line has three integers t, a and b. If t=1, you should reverse a subarray from a to b. If t=2, you should calculate the sum of values from a to b.
Print the answer to each operation where t=2.
- 1 \le n \le 2 \cdot 10^5
- 1 \le m \le 10^5
- 0 \le x_i \le 10^9
- 1 \le a \le b \le n
8 3 2 1 3 4 5 3 4 4 2 2 4 1 3 6 2 2 4