ID NAME QUALITY USERS ACC % DIFFICULTY C I
30734 Ada and Orange Tree   6 32
17
21
30735 Ada and Island   4 46
17
13
21326 Akbar , The great   7 375
21
19
30500 THE HONEYCOMB MAZE   10 136
19
16
10283 ALL IZZ WELL   42 2260
18
13
372 The Benefactor   28 2016
13
12
3377 A Bug’s Life   122 5789
14
13
10380 prayatna PR   43 2584
6
7
27182 Easy modified sudoku   4 117
17
17
9126 Time to live   20 1059
12
15
12183 Help the Commander in Chief   19 347
14
17
38 Labyrinth   46 3451
19
16
30827 THE LAST SHOT   6 261
8
6
1436 Is it a tree   181 9765
10
10
1437 Longest path in a tree   192 8323
14
15
20775 Roger and tree   15 171
16
21
13745 Crack the Safe   14 437
14
13
17732 Salary Management   7 135
21
27
16277 Little Red-Cap   -1 175
26
26
18532 Tree _order   20 658
15
9
1696 Will Indiana Jones Get There   99
50
50

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depth-first search

https://en.wikipedia.org/wiki/Depth-first_search https://www.ics.uci.edu/~eppstein/161/960215.html