ID NAME QUALITY USERS ACC % DIFFICULTY C I
30734 Ada and Orange Tree   6 28
17
21
30735 Ada and Island   3 40
17
12
21326 Akbar , The great   7 354
21
19
30500 THE HONEYCOMB MAZE   8 128
19
16
10283 ALL IZZ WELL   41 2202
18
13
372 The Benefactor   26 1988
13
12
3377 A Bug’s Life   116 5556
14
13
10380 prayatna PR   40 2471
6
7
27182 Easy modified sudoku   3 112
17
17
9126 Time to live   19 996
11
15
12183 Help the Commander in Chief   17 326
14
17
38 Labyrinth   46 3388
19
16
30827 THE LAST SHOT   5 232
8
6
1436 Is it a tree   169 9496
10
11
1437 Longest path in a tree   186 8061
14
15
20775 Roger and tree   15 167
16
21
13745 Crack the Safe   14 430
14
13
17732 Salary Management   7 135
21
27
16277 Little Red-Cap   -1 175
26
26
18532 Tree _order   18 630
14
9
1696 Will Indiana Jones Get There   97
50
50

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