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+====== Contest Problem Sets======
+===== Contest 21.2.2013 =====
+  * [[http://www.spoj.com/problems/SHPATH/|The Shortest Path (Graphs)]] - Find shortest paths between pairs of cities.\\
+  * [[http://www.spoj.com/problems/SAMER08F/|Feynman (Classical)]] - Find the number of squares in a NxN grid.\\
+  * [[http://www.spoj.com/problems/NGM/|A Game with Numbers (Games)]] - An easy problem from the game theory, yet it is not needed to solve this problem.\\
+  * [[http://www.spoj.com/problems/PT07Z/|Longest Path in a Tree (Graphs)]] - Well-known problem of finding the diameter of a tree.\\
+  * [[http://www.spoj.com/problems/PT07Y/|Is it a tree (Graphs)]] - Determine, whether the graph on the input is a tree.\\
+  * [[http://www.spoj.com/problems/MARBLES/|Marbles (Combinatorics)]] - Find out the number of ways to choose marbles given the requirements.\\
+  * [[http://www.spoj.com/problems/FIBOSUM/|Fibonnaci Sum (Maths)]] - Finding sum of consecutive terms in Fibonacci sequence in the given range.\\
+  * [[http://www.spoj.com/problems/NY10A/|Penney Game (Classical)]] - Finding the number of occurences of particular coin toss sequences in a 40 tosses long sequence.\\
+  * [[http://www.spoj.com/problems/CANTON/|Count on Cantor (Classical)]] - Telling what is the n-th rational number in the "Cantor's sequence".
+  * [[http://www.spoj.com/problems/POUR1/|Pouring Water (Classical)]] - Determine the least number of steps to acquire a given amount of water using 2 vessels.
+  * [[http://www.spoj.com/problems/LABYR1/|Labyrinth (Graphs)]] - The same as the problem - [[http://www.spoj.com/problems/PT07Z/|Longest Path in a Tree]] - but it is not as simple as that - you need to parse the input and build the tree.