- Time limit: 1.00 s
- Memory limit: 512 MB
The first input line has two integers $n$ and $m$: the length of the string and the number of operations. The characters of the string are numbered $1,2,\dots,n$.
The next line has a string of length $n$ that consists of characters A–Z.
Finally, there are $m$ lines that describe the operations. Each line has two integers $a$ and $b$: you reverse a substring from position $a$ to position $b$.
Print the final string after all the operations.
- $1 \le n, m \le 2 \cdot 10^5$
- $1 \le a \le b \le n$