## Problems by categories

• algo.is, nice problems from Bjarki Ágúst Guðmundsson (NWERC course in Reykjavik University, Iceland)
• cses, problem set mainly from Antti Laaksonen (Finland)
• trains/paris, nice problems from Vitaly Aksenov (SWERC course in Télécom Paris)

We also selected a few problems, which we think are good training material for programming contests.

Show chapter hint.

problemjudge
Anagram verifier[spoj:ANGRAM]
Boolean Logic[spoj:BOOLE]
Arithmetic Expressions[spoj:AREX]
Cells[spoj:IPCELLS]
Negative Cycles[spoj:NEGCYC]
Hike on a Graph[spoj:HIKE]
Prime Path[spoj:PPATH]
Police Query[spoj:POLQUERY]
Fill the cisterns[spoj:CISTFILL]
Egg Drop[gcj:eggdrop]
Crime Wave[icpcarchive:5584]
Dungeon of Death[spoj:QUEST4]
Muddy Fields[spoj:MUDDY]
Mission Improbable[kattis:improbable]
Closest Point Pair[spoj:CLOPPAIR]
Closest Triplet[spoj:CLOSEST]
The Ant[spoj:ANTTT]
Lego[spoj:LEGO]
Frosting on the Cake[icpcarchive:8154]
Doors and Penguins[spoj:DOORSPEN]
Build the Fence[spoj:BSHEEP]
Blowing Candles[icpcarchive:8155]
Sudoku[spoj:SUDOKU]
Making Jumps[spoj:MKJUMPS]
Unique Encryption Keys[icpcarchive:5881]
ABC Path[spoj:ABCPATH]
A Bug’s Life[spoj:BUGLIFE]
Mice and Maze[spoj:MICEMAZE]
Dragon Maze[gcj:China2014roundB]
Reservations of taxis[kattis:taxicab]
Stock Charts[gcj:2009round2C]
Taxi Cab Scheme[icpcarchive:3126]
Fast Maximum Flow[spoj:FASTFLOW]
A Famous Grid[spoj:SPIRALGR]
Enormous Input Test[spoj:INTEST]
The Spiral of Primes[icpcarchive:2120]
Prime or Not[spoj:PON]
Bazinga![spoj:DCEPC505]
Goldbach graphs[spoj:GOLDG]
Free Tour[spoj:FTOUR]
The last digit[spoj:LASTDIG]
Tiling a Grid With Dominoes[spoj:GNY07H]
Potholers[spoj:POTHOLE]
Maximum Flow[spoj:FLOW]
Stable Marriage Problem[spoj:STABLEMP]
Ars Longa[icpcarchive:3563]
Linear Equation Solver[spoj:LINQSOLV]
Minimum Scalar Product[gcj:2008round1A]
Minimal Coverage[timus:1303]
KATHTHI[spoj:KATHTHI]
Huffman Trees[poj:1261]
It can be arranged[kattis:itcanbearranged]
Ricochet Robots[kattis:ricochetrobots]
4 Values whose Sum is 0[poj:2785]
Maximum Sum Sequences[spoj:MAXSUMSQ]
Largest Rectangle[codechef:LARGEST]
The Knapsack Problem[spoj:KNAPSACK]
Knapsack[spoj:KNPSACK]
Find the maximal product of string prefixes[codility:carbo2013]
A Needle in the Haystack[spoj:NHAY]
Power strings[kattis:powerstrings]
Period[spoj:PERIOD]
Cobbled streets[spoj:CSTREET]
Minimum Spanning Tree[spoj:MST]
Selfish Cities[spoj:SCITIES]
Philosophers Stone[spoj:BYTESM2]
Edit distance[spoj:EDIST]
Longest Common Substring[spoj:LCS]
Easy Longest Increasing Subsequence[spoj:ELIS]
Lowest Common Ancestor[spoj:LCA]
Longest Palindromic Substring[spoj:LPS]
Casting Spells[kattis:castingspells]
Mixtures[spoj:Mixtures]
The Safe Secret[kattis:safesecret]
Sweet and Sour Rock[spoj:ROCK]
Mergesort[spoj:MERGSORT]
Landscaping[kattis:landscaping]
Coconuts[spoj:COCONUTS]
Word Rings[spoj:WORDRING]
The Next Permutation[spoj:NEXT]
Great Swerc[spoj:SWERC14A]
Almost Shortest Path[spoj:SAMER08A]
Flowery Trails[kattis:flowerytrails]
Labyrinth[spoj:LABYR1]
Longest path in a tree[spoj:PT07Z]
SpeedCameras[codility:calcium2015]
Toil for Oil[spoj:OIL]
T9[poj:1451]
Fibonacci Sum[spoj:FIBOSUM]
Longest Common Substring[spoj:LCS]
Negative Score[spoj:RPLN]
Largest Rectangle in a Histogram[spoj:HISTOGRA]
Rectangle[spoj:HMSRECT]
Making Chess Boards[spoj:CT101CC]
Capital City[spoj:CAPCITY]
Encryption[spoj:CENCRY]
Phone List[spoj:PHONELST]
A concrete simulation[spoj:ACS]
Havannah[gcj:2013round3B]
Boat Burglary[spoj:BURGLARY]
Easy sudoku[spoj:EASUDOKU]
Topological Sorting[spoj:TOPOSORT]
Project File Dependencies[spoj:PFDEP]
All Disks Considered[spoj:ALL]
Small TSP[spoj:STSP]
Collecting Beepers[kattis:beepers]