codeforces Codeforces Round #345 (Div. 1) C. Table Compression 排序+并查集

Little Petya is now fond of data compression algorithms. He has already studied gz, bz, zip algorithms and many others. Inspired by the new knowledge, Petya is now developing the new compression algorithm which he wants to name dis.

Petya decided to compress tables. He is given a table a consisting of n rows and m columns that is filled with positive integers. He wants to build the table a' consisting of positive integers such that the relative order of the elements in each row and each column remains the same. That is, if in some row i of the initial table a_i, j < a_i, k, then in the resulting table a'_i, j < a'_i, k, and if a_i, j = a_i, k then a'_i, j = a'_i, k. Similarly, if in some column j of the initial table a_i, j < a_p, j then in compressed table a'_i, j < a'_p, j and if a_i, j = a_p, j then a'_i, j = a'_p, j.

Because large values require more space to store them, the maximum value in a' should be as small as possible.

Petya is good in theory, however, he needs your help to implement the algorithm.

The first line of the input contains two integers n and m (, the number of rows and the number of columns of the table respectively.

Each of the following n rows contain m integers a_i, j (1 ≤ a_i, j ≤ 10⁹) that are the values in the table.

Output the compressed table in form of n lines each containing m integers.

If there exist several answers such that the maximum number in the compressed table is minimum possible, you are allowed to output any of them.

In the first sample test, despite the fact a_1, 2 ≠ a₂₁, they are not located in the same row or column so they may become equal after the compression.

题意:个数不超过1e6个数的二维数列；按照行与列数的相对大小尽可能的缩小为正整数，但不在同一行或同一列的数的缩放前后的大小没有关系；

输出缩放后的数列；

思路:排序后每次处理都是处理值相等的一串数据，并且是看成没没有填入到新数组中，这样使用并查集就可以得到“十”字形相等的根节点的最大值，即所有这棵并查集下的节点的值；x[i],y[i]来模拟并查集，X[],Y[]表示行列上一个值填到的数值，所以之后直接得到根节点所要填入的值；