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| 1 | +using Open.Collections.Numeric; |
| 2 | +using System.Linq; |
| 3 | +using Xunit; |
| 4 | + |
| 5 | +namespace Open.Collections.Tests |
| 6 | +{ |
| 7 | + public class SumCombinationTests |
| 8 | + { |
| 9 | + readonly PossibleAddends SC = new(); |
| 10 | + |
| 11 | + [Fact] |
| 12 | + public void NoAddendsLessThan2() |
| 13 | + { |
| 14 | + for (int i = 0; i < 2; i++) |
| 15 | + { |
| 16 | + Assert.Empty(SC.UniqueAddendsFor(7, i)); |
| 17 | + Assert.Empty(PossibleAddends.GetUniqueAddendsBuffered(7, i)); |
| 18 | + } |
| 19 | + } |
| 20 | + |
| 21 | + [Fact] |
| 22 | + public void NoAddendsWithLowSum() |
| 23 | + { |
| 24 | + for (int i = 0; i < 4; i++) |
| 25 | + { |
| 26 | + Assert.Empty(SC.UniqueAddendsFor(2, i)); |
| 27 | + Assert.Empty(PossibleAddends.GetUniqueAddendsBuffered(2, i)); |
| 28 | + } |
| 29 | + } |
| 30 | + |
| 31 | + [Fact] |
| 32 | + public void AddendsFor2() |
| 33 | + { |
| 34 | + { |
| 35 | + var result = SC.UniqueAddendsFor(3, 2); |
| 36 | + Assert.Equal(1, result.Count); |
| 37 | + Assert.Equal(new int[] { 1, 2 }, result[0]); |
| 38 | + Assert.Equal(result, PossibleAddends.GetUniqueAddendsEnumerable(3, 2)); |
| 39 | + } |
| 40 | + { |
| 41 | + var result = SC.UniqueAddendsFor(4, 2); |
| 42 | + Assert.Equal(1, result.Count); |
| 43 | + Assert.Equal(new int[] { 1, 3 }, result[0]); |
| 44 | + Assert.Equal(result, PossibleAddends.GetUniqueAddendsEnumerable(4, 2)); |
| 45 | + } |
| 46 | + { |
| 47 | + var result = SC.UniqueAddendsFor(5, 2); |
| 48 | + Assert.Equal(2, result.Count); |
| 49 | + Assert.Equal(new int[] { 1, 4 }, result[0]); |
| 50 | + Assert.Equal(new int[] { 2, 3 }, result[1]); |
| 51 | + Assert.Equal(result, PossibleAddends.GetUniqueAddendsEnumerable(5, 2)); |
| 52 | + } |
| 53 | + { |
| 54 | + var result = SC.UniqueAddendsFor(6, 2); |
| 55 | + Assert.Equal(2, result.Count); |
| 56 | + Assert.Equal(new int[] { 1, 5 }, result[0]); |
| 57 | + Assert.Equal(new int[] { 2, 4 }, result[1]); |
| 58 | + Assert.Equal(result, PossibleAddends.GetUniqueAddendsEnumerable(6, 2)); |
| 59 | + } |
| 60 | + { |
| 61 | + var result = SC.UniqueAddendsFor(7, 2); |
| 62 | + Assert.Equal(3, result.Count); |
| 63 | + Assert.Equal(new int[] { 1, 6 }, result[0]); |
| 64 | + Assert.Equal(new int[] { 2, 5 }, result[1]); |
| 65 | + Assert.Equal(new int[] { 3, 4 }, result[2]); |
| 66 | + Assert.Equal(result, PossibleAddends.GetUniqueAddendsEnumerable(7, 2)); |
| 67 | + } |
| 68 | + } |
| 69 | + |
| 70 | + |
| 71 | + [Fact] |
| 72 | + public void AddendsFor3() |
| 73 | + { |
| 74 | + { |
| 75 | + for (int i = 0; i < 6; i++) |
| 76 | + { |
| 77 | + var result = SC.UniqueAddendsFor(i, 3); |
| 78 | + Assert.Empty(result); |
| 79 | + Assert.Empty(PossibleAddends.GetUniqueAddendsBuffered(i, 3)); |
| 80 | + } |
| 81 | + } |
| 82 | + { |
| 83 | + var result = SC.UniqueAddendsFor(6, 3); |
| 84 | + Assert.Equal(1, result.Count); |
| 85 | + Assert.Equal(new int[] { 1, 2, 3 }, result[0]); |
| 86 | + Assert.Equal(result, PossibleAddends.GetUniqueAddendsEnumerable(6, 3)); |
| 87 | + } |
| 88 | + { |
| 89 | + var result = SC.UniqueAddendsFor(7, 3); |
| 90 | + Assert.Equal(1, result.Count); |
| 91 | + Assert.Equal(new int[] { 1, 2, 4 }, result[0]); |
| 92 | + Assert.Equal(result, PossibleAddends.GetUniqueAddendsEnumerable(7, 3)); |
| 93 | + } |
| 94 | + { |
| 95 | + var result = SC.UniqueAddendsFor(8, 3); |
| 96 | + Assert.Equal(2, result.Count); |
| 97 | + Assert.Equal(new int[] { 1, 2, 5 }, result[0]); |
| 98 | + Assert.Equal(new int[] { 1, 3, 4 }, result[1]); |
| 99 | + Assert.Equal(result, PossibleAddends.GetUniqueAddendsEnumerable(8, 3)); |
| 100 | + } |
| 101 | + { |
| 102 | + var result = SC.UniqueAddendsFor(9, 3); |
| 103 | + Assert.Equal(3, result.Count); |
| 104 | + Assert.Equal(new int[] { 1, 2, 6 }, result[0]); |
| 105 | + Assert.Equal(new int[] { 1, 3, 5 }, result[1]); |
| 106 | + Assert.Equal(new int[] { 2, 3, 4 }, result[2]); |
| 107 | + Assert.Equal(result, PossibleAddends.GetUniqueAddendsEnumerable(9, 3)); |
| 108 | + } |
| 109 | + { |
| 110 | + var result = SC.UniqueAddendsFor(10, 3); |
| 111 | + Assert.Equal(4, result.Count); |
| 112 | + Assert.Equal(new int[] { 1, 2, 7 }, result[0]); |
| 113 | + Assert.Equal(new int[] { 1, 3, 6 }, result[1]); |
| 114 | + Assert.Equal(new int[] { 1, 4, 5 }, result[2]); |
| 115 | + Assert.Equal(new int[] { 2, 3, 5 }, result[3]); |
| 116 | + Assert.Equal(result, PossibleAddends.GetUniqueAddendsEnumerable(10, 3)); |
| 117 | + } |
| 118 | + |
| 119 | + { |
| 120 | + var result = SC.UniqueAddendsFor(15, 3); |
| 121 | + Assert.Equal(12, result.Count); |
| 122 | + Assert.Equal(new int[] { 1, 2, 12 }, result[0]); |
| 123 | + Assert.Equal(new int[] { 1, 3, 11 }, result[1]); |
| 124 | + Assert.Equal(new int[] { 1, 4, 10 }, result[2]); |
| 125 | + Assert.Equal(new int[] { 2, 3, 10 }, result[3]); |
| 126 | + Assert.Equal(new int[] { 1, 5, 9 }, result[4]); |
| 127 | + Assert.Equal(new int[] { 2, 4, 9 }, result[5]); |
| 128 | + Assert.Equal(new int[] { 1, 6, 8 }, result[6]); |
| 129 | + Assert.Equal(new int[] { 2, 5, 8 }, result[7]); |
| 130 | + Assert.Equal(new int[] { 3, 4, 8 }, result[8]); |
| 131 | + Assert.Equal(new int[] { 2, 6, 7 }, result[9]); |
| 132 | + Assert.Equal(new int[] { 3, 5, 7 }, result[10]); |
| 133 | + Assert.Equal(new int[] { 4, 5, 6 }, result[11]); |
| 134 | + Assert.Equal(result, PossibleAddends.GetUniqueAddendsEnumerable(15, 3)); |
| 135 | + } |
| 136 | + } |
| 137 | + |
| 138 | + } |
| 139 | +} |
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