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CSES Problem Set

Forest Queries II

Task | Statistics

CSES - Forest Queries IICSES - Forest Queries II

Time limit:1.00 s Memory limit:512 MB

You are given an $n \times n$ grid representing the map of a forest. Each square is either empty or has a tree. Your task is to process $q$ queries of the following types:
  1. Change the state (empty/tree) of a square.
  2. How many trees are inside a rectangle in the forest?

The first input line has two integers $n$ and $q$: the size of the forest and the number of queries.

Then, there are $n$ lines describing the forest. Each line has $n$ characters: . is an empty square and * is a tree.

Finally, there are $q$ lines describing the queries. The format of each line is either "$1$ $y$ $x$" or "2 $y_1$ $x_1$ $y_2$ $x_2$".


Print the answer to each query of the second type.


4 3
2 2 2 3 4
1 3 3
2 2 2 3 4