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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link href="favicon.ico" rel="shortcut icon" type="image/x-icon" />
<title>A2OJ Category: backtracking</title>
<style>
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<font size=4>
<b>
<u>
backtracking problems</u></b></font><br/><br/>
<table>
<tr>
<th></th>
<th>Problem Name</th>
<th>Online Judge</th>
<th>Year</th>
<th>Contest</th>
<th>Difficulty Level</th>
</tr>
<tr>
<td>1</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=569" target="_blank">Passwords</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>1</td>
</tr>
<tr>
<td>2</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=48" target="_blank">Tree Summing</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>1</td>
</tr>
<tr>
<td>3</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=580" target="_blank">Don't Get Rooked</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>1</td>
</tr>
<tr>
<td>4</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=3678" target="_blank">Expert Enough?</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>1</td>
</tr>
<tr>
<td>5</td>
<td><a href="http://codeforces.com/problemset/problem/476/B" target="_blank">Dreamoon and WiFi</a></td>
<td>Codeforces</td>
<td></td>
<td>Codeforces Round #272 (Div. 2)</td>
<td>1</td>
</tr>
<tr>
<td>6</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=1285" target="_blank">23 out of 5</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>1</td>
</tr>
<tr>
<td>7</td>
<td><a href="http://www.spoj.com/problems/MKJUMPS/" target="_blank">Making Jumps</a></td>
<td>SPOJ</td>
<td></td>
<td></td>
<td>1</td>
</tr>
<tr>
<td>8</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=670" target="_blank">The Hamming Distance Problem</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>1</td>
</tr>
<tr>
<td>9</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=691" target="_blank">8 Queens Chess Problem</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>1</td>
</tr>
<tr>
<td>10</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=465" target="_blank">Prime Ring Problem</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>1</td>
</tr>
<tr>
<td>11</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=227" target="_blank">The House Of Santa Claus</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>1</td>
</tr>
<tr>
<td>12</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=515" target="_blank">Sum It Up</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>1</td>
</tr>
<tr>
<td>13</td>
<td><a href="http://www.spoj.com/problems/ABCPATH/" target="_blank">ABC Path</a></td>
<td>SPOJ</td>
<td></td>
<td></td>
<td>1</td>
</tr>
<tr>
<td>14</td>
<td><a href="http://www.spoj.com/problems/ALLIZWEL/" target="_blank">ALL IZZ WELL</a></td>
<td>SPOJ</td>
<td></td>
<td></td>
<td>1</td>
</tr>
<tr>
<td>15</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=2026" target="_blank">Back to the 8-Queens</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>1</td>
</tr>
<tr>
<td>16</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=382" target="_blank">Lotto</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>1</td>
</tr>
<tr>
<td>17</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=103" target="_blank">The Sultan's Successors</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>1</td>
</tr>
<tr>
<td>18</td>
<td><a href="https://icpcarchive.ecs.baylor.edu/index.php?option=onlinejudge&page=show_problem&problem=5215" target="_blank">At most twice</a></td>
<td>Live Archive</td>
<td>2015</td>
<td>Latin America</td>
<td>1</td>
</tr>
<tr>
<td>19</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=565" target="_blank">CD</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>1</td>
</tr>
<tr>
<td>20</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=1217" target="_blank">Hanoi Tower Troubles Again!</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>1</td>
</tr>
<tr>
<td>21</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=666" target="_blank">Division</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>1</td>
</tr>
<tr>
<td>22</td>
<td><a href="http://www.spoj.com/problems/VONNY/" target="_blank">Vonny and her dominos</a></td>
<td>SPOJ</td>
<td></td>
<td></td>
<td>2</td>
</tr>
<tr>
<td>23</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=2136" target="_blank">Another n-Queen Problem</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>2</td>
</tr>
<tr>
<td>24</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=1363" target="_blank">Knights in FEN</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>2</td>
</tr>
<tr>
<td>25</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=1871" target="_blank">A-Sequence</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>2</td>
</tr>
<tr>
<td>26</td>
<td><a href="https://icpcarchive.ecs.baylor.edu/index.php?option=onlinejudge&page=show_problem&problem=3584" target="_blank">Dividing coins</a></td>
<td>Live Archive</td>
<td>1996</td>
<td>Europe - Northwestern</td>
<td>3</td>
</tr>
<tr>
<td>27</td>
<td><a href="http://www.spoj.com/problems/UCI2009D/" target="_blank">Digger Octaves</a></td>
<td>SPOJ</td>
<td></td>
<td></td>
<td>3</td>
</tr>
<tr>
<td>28</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=848" target="_blank">Winterim Backpacking Trip</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>3</td>
</tr>
<tr>
<td>29</td>
<td><a href="https://icpcarchive.ecs.baylor.edu/index.php?option=onlinejudge&page=show_problem&problem=3320" target="_blank">Sum It Up</a></td>
<td>Live Archive</td>
<td>1997</td>
<td>North America - Mid-Central USA</td>
<td>3</td>
</tr>
<tr>
<td>30</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=2258" target="_blank">Playing Boggle</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>3</td>
</tr>
<tr>
<td>31</td>
<td><a href="http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=1275" target="_blank">Run, Run, Runaround Numbers</a></td>
<td>ZOJ</td>
<td></td>
<td></td>
<td>3</td>
</tr>
<tr>
<td>32</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=545" target="_blank">The Boggle Game</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>3</td>
</tr>
<tr>
<td>33</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=942" target="_blank">Garden of Eden</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>3</td>
</tr>
<tr>
<td>34</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=717" target="_blank">Monkeys in a Regular Forest</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>3</td>
</tr>
<tr>
<td>35</td>
<td><a href="https://icpcarchive.ecs.baylor.edu/index.php?option=onlinejudge&page=show_problem&problem=3393" target="_blank">Word Index</a></td>
<td>Live Archive</td>
<td>1995</td>
<td>North America - East Central NA</td>
<td>4</td>
</tr>
<tr>
<td>36</td>
<td><a href="https://icpcarchive.ecs.baylor.edu/index.php?option=onlinejudge&page=show_problem&problem=3228" target="_blank">The Sultan's Successors</a></td>
<td>Live Archive</td>
<td>1991</td>
<td>South Pacific</td>
<td>4</td>
</tr>
<tr>
<td>37</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=1748" target="_blank">Prim</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>5</td>
</tr>
<tr>
<td>38</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=4387" target="_blank">Hexagonal Puzzle</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>6</td>
</tr>
<tr>
<td>39</td>
<td><a href="http://codeforces.com/problemset/problem/662/B" target="_blank">Graph Coloring</a></td>
<td>Codeforces</td>
<td></td>
<td>CROC 2016 - Final Round [Private, For Onsite Finalists Only]</td>
<td>6</td>
</tr>
<tr>
<td>40</td>
<td><a href="https://icpcarchive.ecs.baylor.edu/index.php?option=onlinejudge&page=show_problem&problem=3477" target="_blank">The Boggle Game</a></td>
<td>Live Archive</td>
<td>1997</td>
<td>North America - Pacific Northwest</td>
<td>7</td>
</tr>
<tr>
<td>41</td>
<td><a href="https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=2300" target="_blank">This Means War!</a></td>
<td>UVA</td>
<td></td>
<td></td>
<td>8</td>
</tr>
<tr>
<td>42</td>
<td><a href="https://icpcarchive.ecs.baylor.edu/index.php?option=onlinejudge&page=show_problem&problem=502" target="_blank">Knight Moves</a></td>
<td>Live Archive</td>
<td>2002</td>
<td>North America - Southeast USA</td>
<td>10</td>
</tr>
</table>
</center>
</body>
</html>