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Please read the general instructions for this exercise first. Here are the additional instructions specific to this task:
Design a more efficient algorithm that (at least in typical cases) does not need to try out all possible locations of the rectangle. Implement the algorithm efficiently on the CPU.
I will first run all kinds of tests to see that your code works correctly. You can try it out locally by running
./grading test, but please note that your code has to compile and work correctly not only on your own computer but also on our machines.
If all is fine, I will run the benchmarks. You can try it out on your own computer by running
./grading benchmark, but of course the precise running time on your own computer might be different from the performance on our grading hardware.
|benchmarks/1||nx = 100, ny = 100|
|the input is a multicolor image with 100 × 100 pixels|
|benchmarks/2a||nx = 199, ny = 199|
|the input is a structured black-and-white image with 199 × 199 pixels|
|benchmarks/2b||nx = 200, ny = 200|
|the input is a structured black-and-white image with 200 × 200 pixels|
|benchmarks/2c||nx = 201, ny = 201|
|the input is a structured black-and-white image with 201 × 201 pixels|
|benchmarks/3||nx = 400, ny = 400|
|the input is a multicolor image with 400 × 400 pixels|
|benchmarks/4||nx = 1000, ny = 1000|
|the input is a multicolor image with 1000 × 1000 pixels|
In this task your submission will be graded using benchmarks/4: the input is a multicolor image with 1000 × 1000 pixels.
The point thresholds are as follows. If you submit your solution no later than on Sunday, 16 April 2023, at 23:59:59 (Helsinki), your score will be:
|≤ 10.000 sec||1|
|≤ 5.000 sec||2|
|≤ 2.000 sec||3|
|≤ 1.000 sec||4|
|≤ 0.500 sec||5|
If you submit your solution after the deadline, but before the course ends on Sunday, 16 April 2023, at 23:59:59 (Helsinki), your score will be:
|≤ 5.000 sec||1|
|≤ 2.000 sec||2|
|≤ 0.500 sec||3|