Preparando MOJI

Rooks Defenders

1000ms 262144K

Description:

You have a square chessboard of size $$$n \times n$$$. Rows are numbered from top to bottom with numbers from $$$1$$$ to $$$n$$$, and columns — from left to right with numbers from $$$1$$$ to $$$n$$$. So, each cell is denoted with pair of integers $$$(x, y)$$$ ($$$1 \le x, y \le n$$$), where $$$x$$$ is a row number and $$$y$$$ is a column number.

You have to perform $$$q$$$ queries of three types:

  • Put a new rook in cell $$$(x, y)$$$.
  • Remove a rook from cell $$$(x, y)$$$. It's guaranteed that the rook was put in this cell before.
  • Check if each cell of subrectangle $$$(x_1, y_1) - (x_2, y_2)$$$ of the board is attacked by at least one rook.

Subrectangle is a set of cells $$$(x, y)$$$ such that for each cell two conditions are satisfied: $$$x_1 \le x \le x_2$$$ and $$$y_1 \le y \le y_2$$$.

Recall that cell $$$(a, b)$$$ is attacked by a rook placed in cell $$$(c, d)$$$ if either $$$a = c$$$ or $$$b = d$$$. In particular, the cell containing a rook is attacked by this rook.

Input:

The first line contains two integers $$$n$$$ and $$$q$$$ ($$$1 \le n \le 10^5$$$, $$$1 \le q \le 2 \cdot 10^5$$$) — the size of the chessboard and the number of queries, respectively.

Each of the following $$$q$$$ lines contains description of a query. Description begins with integer $$$t$$$ ($$$t \in \{1, 2, 3\}$$$) which denotes type of a query:

  • If $$$t = 1$$$, two integers $$$x$$$ and $$$y$$$ follows ($$$1 \le x, y \le n$$$) — coordinated of the cell where the new rook should be put in. It's guaranteed that there is no rook in the cell $$$(x, y)$$$ at the moment of the given query.
  • If $$$t = 2$$$, two integers $$$x$$$ and $$$y$$$ follows ($$$1 \le x, y \le n$$$) — coordinates of the cell to remove a rook from. It's guaranteed that there is a rook in the cell $$$(x, y)$$$ at the moment of the given query.
  • If $$$t = 3$$$, four integers $$$x_1, y_1, x_2$$$ and $$$y_2$$$ follows ($$$1 \le x_1 \le x_2 \le n$$$, $$$1 \le y_1 \le y_2 \le n$$$) — subrectangle to check if each cell of it is attacked by at least one rook.

It's guaranteed that among $$$q$$$ queries there is at least one query of the third type.

Output:

Print the answer for each query of the third type in a separate line. Print "Yes" (without quotes) if each cell of the subrectangle is attacked by at least one rook.

Otherwise print "No" (without quotes).

Sample Input:

8 10
1 2 4
3 6 2 7 2
1 3 2
3 6 2 7 2
1 4 3
3 2 6 4 8
2 4 3
3 2 6 4 8
1 4 8
3 2 6 4 8

Sample Output:

No
Yes
Yes
No
Yes

Note:

Consider example. After the first two queries the board will look like the following picture (the letter $$$R$$$ denotes cells in which rooks are located, the subrectangle of the query of the third type is highlighted in green):

Chessboard after performing the third and the fourth queries:

Chessboard after performing the fifth and the sixth queries:

Chessboard after performing the seventh and the eighth queries:

Chessboard after performing the last two queries:

Informação

Codeforces

Provedor Codeforces

Código CF1679C

Tags

data structuresimplementation

Submetido 0

BOUA! 0

Taxa de BOUA's 0%

Datas 09/05/2023 10:28:13

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