Volume 21 (2,100-2,199)

Problem ID Title Solution by Most Popular Input by
2100 Poly-Polygonal Numbers
2101 Rational Approximation
2102 Stacking Cubes
2103 Checker's Check
2104 To Bet or Not to Bet
2105 BSP Trees
2106 Double Trouble (1)
2107 Double, Double, Toil and Trouble
2109 The Computerized Contractor
2113 It's Time for Change
2114 Code Name: Double-Omega VII
2115 An Inductively-Defined Function
2116 The Mobius Function
2117 Ro and Bot Meet
2118 Minesweeper (1)
2119 Before and After
2120 The Spiral of Primes
2121 Maze Checking and Visualization
2122 Recognizing S Expressions
2123 The Quadratic Formula (Mod P)
2124 Base Addition
2126 Poker Solitaire
2127 Embedded Codes
2128 Radio Transmitters
2129 Color Circles
2130 SwampNet Routing
2145 Lost in Space (1)
2146 Family Tree
2147 Push!!
2148 Pump up Batteries
2149 The Devil of Gravity
2150 Numoeba
2151 ACM-ICPC Live Archive
2152 Ether Geometry
2153 Simple Arithmetics
2154 The Bulk
2155 Complete the Sequence!
2156 Direct Visibility
2157 Complicated Expressions
2158 Factorial
2159 The Game of Master-Mind
2160 Hotline
2161 I-Keyboard
2162 S-Trees (1)
2163 Led Codes
2164 Cable Network
2165 Bomb the Bridge
2166 Move the Water
2167 Faking Mondrian
2176 Lattice Point
2177 Coin Exchange
2178 The Minimum Number of Rooks
2179 Mars Colony Construction
2181 A Version of Nim
2182 Tri-Colored Intersections
2184 Atlantis
2185 Cog-Wheels (1)
2186 Software Dispatcher
2187 Video Watcher
2188 The Prank
2189 Mobile Casanova
2190 Being Late
2191 Potentiometers
2192 Collecting Marbles
2193 Expression (1)
2194 The Luncheon
2195 Counting Zeroes
2196 Multiplication
2197 Paint the Roads
2198 Protecting Zonk
2199 Battle of the Triangle