ID NAME QUALITY USERS ACC % DIFFICULTY C I
30734 Ada and Orange Tree   6 25
17
21
21326 Akbar , The great   7 327
21
19
30500 THE HONEYCOMB MAZE   7 101
17
16
10283 ALL IZZ WELL   41 2142
18
13
372 The Benefactor   24 1929
14
13
3377 A Bug’s Life   110 5325
14
13
10380 prayatna PR   34 2323
6
8
27182 Easy modified sudoku   3 106
17
17
9126 Time to live   17 943
11
14
12183 Help the Commander in Chief   16 302
14
16
38 Labyrinth   39 3292
18
16
30827 THE LAST SHOT   3 157
6
3
1436 Is it a tree   157 9201
10
11
1437 Longest path in a tree   179 7852
14
15
20775 Roger and tree   11 155
19
21
13745 Crack the Safe   13 420
13
13
17732 Salary Management   7 131
21
27
16277 Little Red-Cap   -1 171
26
26
18532 Tree _order   14 540
13
8
1696 Will Indiana Jones Get There   97
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