Magic Board

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Long long ago, there is a magic board. The magic board has N*N cells: N rows and N columns. Every cell contains one integer, which is 0 initially. Let the rows and the columns be numbered from 1 to N.
There are 2 types of operations can be applied to the magic board:
 RowSet i x: it means that all integers in the cells on row i have been changed to x after this operation.
 ColSet i x: it means that all integers in the cells on column i have been changed to x after this operation.
And your girlfriend sometimes has an interest in the total number of the integers 0s on some row or column.
 RowQuery i: it means that you should answer the total number of 0s on row i.
 ColQuery i: it means that you should answer the total number of 0s on column i.
Input
The first line of input contains 2 spaceseparated integers N and Q. They indicate the size of the magic board, and the total number of operations and queries from the girlfriend.
Then each of the next Q lines contains an operation or a query by the format mentioned above.
Output
For each query, output the answer of the query.
Constraints
1 ≤ N, Q ≤ 500000 (5 * 10^{5})
1 ≤ i ≤ N
x ∈ {0, 1} (That is, x = 0 or 1)
Sample
Input: 3 6 RowQuery 1 ColSet 1 1 RowQuery 1 ColQuery 1 RowSet 1 0 ColQuery 1 Output: 3 2 0 1
Explanation
At first, the magic board is
000 < row 1 000 000
So the answer of first query "RowQuery 1" is 3.
After the "ColSet 1 1", the board becomes
column 1  V 100 100 100
So the answer of the second query "RowQuery 1" is clearly 2, since the cell (1,1) became 1. And the answer of the third query "ColQuery 1" is 0.
Finally, apply the operation "RowSet 1 0", the board has changed to
000 100 100
From this board, the answer of the last query "ColQuery 1" should be 1.
Author:  shangjingbo 
Tester:  laycurse 
Editorial  http://discuss.codechef.com/problems/MBOARD 
Tags  datastructure, feb13, medium, shangjingbo 
Date Added:  15102012 
Time Limit:  0.6 sec 
Source Limit:  50000 Bytes 
Languages:  C, CPP14, JAVA, PYTH, PYTH 3.5, CS2, PAS fpc, PAS gpc, RUBY, PHP, GO, NODEJS, HASK, D, PERL, FORT, WSPC, ADA, CAML, ICK, BF, ASM, CLPS, PRLG, ICON, PIKE, ST, NICE, LUA, BASH, NEM, LISP sbcl, LISP clisp, SCM guile, JS, ERL, TCL, PERL6, TEXT, CLOJ, FS 
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