Painting A Board
Time Limit: 2 Seconds
Memory Limit: 65536 KB
The CE digital company has built an Automatic Painting Machine (APM) to paint
a flat board fully covered by adjacent non-overlapping rectangles of different
sizes each with a predefined color.
To color the board, the APM has access to a set of brushes. Each brush has
a distinct color C. The APM picks one brush with color C and paints all possible
rectangles having predefined color C with the following restrictions:
To avoid leaking the paints and mixing colors, a rectangle can only be painted
if all rectangles immediately above it have already been painted. For example
rectangle labeled F in Figure 1 is painted only after rectangles C and D are
painted. Note that each rectangle must be painted at once, i.e. partial painting
of one rectangle is not allowed.
You are to write a program for APM to paint a given board so that the number
of brush pick-ups is minimum. Notice that if one brush is picked up more than
once, all pick-ups are counted.
The first line of the input file contains an integer M which is the number of
test cases to solve (1 <= M <= 10). For each test case, the first line
contains an integer N, the number of rectangles, followed by N lines describing
the rectangles. Each rectangle R is specified by 5 integers in one line: the
y and x coordinates of the upper left corner of R, the y and x coordinates of
the lower right corner of R, followed by the color-code of R.
1. Color-code is an integer in the range of 1 .. 20.
2. Upper left corner of the board coordinates is always (0,0).
3. Coordinates are in the range of 0 .. 99.
4. N is in the range of 1..15.
One line for each test case showing the minimum number of brush pick-ups.
0 0 2 2 1
0 2 1 6 2
2 0 4 2 1
1 2 4 4 2
1 4 3 6 1
4 0 6 4 1
3 4 6 6 2
Note : This sample input corresponds to Figure 1.
Source: Asia 1999, Tehran (Iran)