Cody

# Problem 42498. Pancake sorting - minimum flips.

Solution 2708481

Submitted on 18 Jul 2020 by Masato Kanematsu
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### Test Suite

Test Status Code Input and Output
1   Pass

2   Pass
x = 1:5; for spatula = sort_pancakes(x) x(1:spatula) = flip(x(1:spatula)); end assert(issorted(x))

3   Pass
x = [6 4 2 5 3 1]; for spatula = sort_pancakes(x) x(1:spatula) = flip(x(1:spatula)); end assert(issorted(x))

4   Pass
x = randperm(12); for spatula = sort_pancakes(x) x(1:spatula) = flip(x(1:spatula)); end assert(issorted(x))

5   Pass
x = randperm(13); for spatula = sort_pancakes(x) x(1:spatula) = flip(x(1:spatula)); end assert(issorted(x))

6   Pass
for k = 1:20 x = randperm(k); for spatula = sort_pancakes(x) x(1:spatula) = flip(x(1:spatula)); end assert(issorted(x)) end

7   Pass
% this test may be extended and rescored sets = { [10 3 2 1 6 5 4 8 7 9] [10:-1:1] [1:10] [2:2:10 1:2:9] [ 9 8 14 5 12 1 10 13 2 7 6 3 15 4 11] [ 7 8 16 13 11 1 9 15 2 6 3 12 10 4 14 5] [ 15 14 19 1 9 4 12 3 16 7 13 20 6 2 11 10 17 5 8 18] [ 2 15 18 4 8 16 10 6 3 14 1 7 20 9 11 12 13 5 19 17 21] [ 5 1 9 3 18 22 17 15 11 16 10 13 2 21 20 6 12 7 23 8 19 14 4] [ 3 9 18 15 7 8 6 10 11 17 21 23 22 1 14 5 2 13 16 12 20 4 19] [ 34 71 51 31 55 61 18 26 59 8 14 6 70 1 25 7 9 4 44 39 19 56 22 32 27 2 11 28 68 57 49 48 20 29 13 10 17 40 3 37 45 63 73 30 43 42 38 21 23 46 62 47 58 69 24 65 60 36 72 64 54 33 5 52 67 66 15 53 12 35 41 16 50]}; for k = 1:numel(sets) x = sets{k}; queue = sort_pancakes(x); for spatula = queue x(1:spatula) = flip(x(1:spatula)); end assert(issorted(x)) n(k) = numel(x); score(k) = numel(queue); end SetSolutionScore(sum(score)); fprintf('\nTest %3d. %3d pancakes, %3d flips',[1:numel(sets); n; score]);

Test 1. 10 pancakes, 14 flips Test 2. 10 pancakes, 17 flips Test 3. 10 pancakes, 18 flips Test 4. 10 pancakes, 10 flips Test 5. 15 pancakes, 28 flips Test 6. 16 pancakes, 29 flips Test 7. 20 pancakes, 36 flips Test 8. 21 pancakes, 36 flips Test 9. 23 pancakes, 42 flips Test 10. 23 pancakes, 39 flips Test 11. 73 pancakes, 140 flips

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