Sereja and Matrix Division
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Read problems statements in Mandarin Chinese and Russian.
Sereja has a matrix with size N*M, a cell with coordinate (i,j) contains the integer A[i][j]. Sereja wants to divide the matrix into two parts between him and Dima. Sereja wants to choose C rectangles, i-th rectangle has coordinates X1[i], Y1[i], X2[i], Y2[i] (1 <= X1[i] <= X2[i] <= N , 1 <= Y1[i] <= Y2[i] <= M , we assume that any cell with coordinate (x, y) fits condition X1[i] <= x <= X2[i] and Y1[i] <= y <= Y2[i] lies inside i-th rectangle). They need to be chosen in such a way that rectangles divide matrix in two equal parts. Lets Q[x] be number of number x from given matrix, that lies in at least one of the chosen rectangles, let W[x] be the opposite value - number of number x from the given matrix, that lies outside of each rectangle. Set of chosen rectangles divide matrix on two equal parts if and only if Q[x]=W[x] for all x.
Help Sereja minimize number C. Also find C rectangles that divide matrix in two equal parts.
InputFirst line contains the number of test cases T. T tests follow. First line of each test case contains integers N, M. Each of the next N lines contains M integers. It is guaranteed that there is at least one required division.
OutputFirst line of each test case should contain number C. Each of next C lines contains four numbers - coordinates of a rectangle. Sum of squares of all chosen rectangles shouldn't exceed N*M.
- 1 ≤ T ≤ 100
- 1 ≤ N, M ≤ 100
- 1 ≤ A[i][j] ≤ 1000
Input: 1 4 5 1 2 3 4 5 5 4 3 2 1 6 7 8 9 10 6 7 8 9 10 Output: 2 1 1 1 5 4 1 4 5
ScoringFor each test case you will gain score Y as sum of all C in output. Lets yourscore is equal to sum of all Y. Score you will see on dashboard will be equal to bestscore/yourscore.
Tests generationThere will be five test cases. Each test case will contain 100 tests inside, in each test N = M = 100. Matrices are generated randomly and they are guaranteed to have at least one solution.
|Time Limit:||10 sec|
|Source Limit:||50000 Bytes|
|Languages:||C, CPP14, JAVA, PYTH, PYTH 3.5, CS2, PAS fpc, PAS gpc, RUBY, PHP, GO, NODEJS, HASK, SCALA, D, PERL, FORT, WSPC, ADA, CAML, ICK, BF, ASM, CLPS, PRLG, ICON, SCM qobi, PIKE, ST, NICE, LUA, BASH, NEM, LISP sbcl, LISP clisp, SCM guile, JS, ERL, TCL, PERL6, TEXT, CLOJ, FS|
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