Cody

# Problem 317. Find the stride of the longest skip sequence

Solution 318429

Submitted on 12 Sep 2013 by James
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### Test Suite

Test Status Code Input and Output
1   Pass
%% a = [1 5 3 11 7 2 4 9]; stride = 2; assert(isequal(skip_sequence_stride(a),stride))

b = 1 2 3 4 5 7 9 11

2   Pass
%% a = [1:5:20 23:3:42 2:9:100]; stride = 9; assert(isequal(skip_sequence_stride(a),stride))

b = Columns 1 through 16 1 2 6 11 16 20 23 26 29 32 35 38 41 47 56 65 Columns 17 through 19 74 83 92

3   Pass
%% a = [2:2:22 13:17]; a = a(randperm(length(a))); stride = 2; assert(isequal(skip_sequence_stride(a),stride))

b = 2 4 6 8 10 12 13 14 15 16 17 18 20 22

4   Pass
%% a = 37:5:120; a = a(randperm(length(a))); stride = 5; assert(isequal(skip_sequence_stride(a),stride))

b = Columns 1 through 16 37 42 47 52 57 62 67 72 77 82 87 92 97 102 107 112 Column 17 117

5   Pass
%% a = [1:5 101:10:171 201:205]; a = a(randperm(length(a))); stride = 10; assert(isequal(skip_sequence_stride(a),stride))

b = Columns 1 through 16 1 2 3 4 5 101 111 121 131 141 151 161 171 201 202 203 Columns 17 through 18 204 205

6   Pass
%% a = [7:17:302 primes(300)]; a = sort(a); stride = 17; assert(isequal(skip_sequence_stride(a),stride))

b = Columns 1 through 16 2 3 5 7 11 13 17 19 23 24 29 31 37 41 43 47 Columns 17 through 32 53 58 59 61 67 71 73 75 79 83 89 92 97 101 103 107 Columns 33 through 48 109 113 126 127 131 137 139 143 149 151 157 160 163 167 173 177 Columns 49 through 64 179 181 191 193 194 197 199 211 223 227 228 229 233 239 241 245 Columns 65 through 76 251 257 262 263 269 271 277 279 281 283 293 296