Codeforces Solutions

Codeforces Beta Round 1
Codeforces Beta Round 2
Codeforces Beta Round 3
Codeforces Beta Round 4 (Div. 2 Only)
Codeforces Beta Round 5
Codeforces Beta Round 6 (Div. 2 Only)
Codeforces Beta Round 7
Codeforces Beta Round 8
Codeforces Beta Round 9 (Div. 2 Only)
Codeforces Beta Round 10
Codeforces Beta Round 11
Codeforces Beta Round 12 (Div 2 Only)
Codeforces Beta Round 13
Codeforces Beta Round 14 (Div. 2)
Codeforces Beta Round 15
Codeforces Beta Round 16 (Div. 2 Only)
Codeforces Beta Round 17
Codeforces Beta Round 18 (Div. 2 Only)
Codeforces Beta Round 19
Codeforces Alpha Round 20 (Codeforces format)
Codeforces Alpha Round 21 (Codeforces format)
Codeforces Beta Round 22 (Div. 2 Only)
Codeforces Beta Round 23
Codeforces Beta Round 24
Codeforces Beta Round 25 (Div. 2 Only)
Codeforces Beta Round 26 (Codeforces format)
Codeforces Beta Round 27 (Codeforces format, Div. 2)
Codeforces Beta Round 28 (Codeforces format)
Codeforces Beta Round 29 (Div. 2, Codeforces format)
Codeforces Beta Round 30 (Codeforces format)
Codeforces Beta Round 31 (Div. 2, Codeforces format)
Codeforces Beta Round 32 (Div. 2, Codeforces format)
Codeforces Beta Round 33 (Codeforces format)
Codeforces Beta Round 34 (Div. 2)
Codeforces Beta Round 35 (Div. 2)
Codeforces Beta Round 36
Codeforces Beta Round 37
School Personal Contest #1 (Winter Computer School 2010/11) - Codeforces Beta Round 38 (ACM-ICPC Rules)
School Team Contest 1 (Winter Computer School 2010/11)
Codeforces Beta Round 39
Codeforces Beta Round 40 (Div. 2)
Codeforces Beta Round 41
Codeforces Beta Round 42 (Div. 2)
School Team Contest 2 (Winter Computer School 2010/11)
School Team Contest 3 (Winter Computer School 2010/11)
School Personal Contest #2 (Winter Computer School 2010/11) - Codeforces Beta Round 43 (ACM-ICPC Rules)
Codeforces Beta Round 44 (Div. 2)
School Personal Contest #3 (Winter Computer School 2010/11) - Codeforces Beta Round 45 (ACM-ICPC Rules)
Codeforces Beta Round 46 (Div. 2)
Codeforces Beta Round 47
Codeforces Beta Round 48
Codeforces Testing Round 1
Codeforces Beta Round 49 (Div. 2)
Codeforces Beta Round 50
Codeforces Beta Round 51
Codeforces Beta Round 52 (Div. 2)
Codeforces Beta Round 53
Codeforces Beta Round 54 (Div. 2)
Codeforces Beta Round 55 (Div. 2)
Codeforces Beta Round 56
Codeforces Beta Round 57 (Div. 2)
Codeforces Beta Round 58
Codeforces Beta Round 59 (Div. 2)
Unknown Language Round 1
Codeforces Beta Round 60
Codeforces Beta Round 61 (Div. 2)
Manthan 2011
Codeforces Beta Round 62
Codeforces Beta Round 63 (Div. 2)
Codeforces Beta Round 64
Codeforces Beta Round 65 (Div. 2)
Unknown Language Round 2
Codeforces Beta Round 66
Codeforces Beta Round 68
Codeforces Beta Round 67 (Div. 2)
All-Ukrainian School Olympiad in Informatics
Codeforces Beta Round 69 (Div. 1 Only)
Codeforces Beta Round 70 (Div. 2)
Codeforces Beta Round 71
Codeforces Beta Round 69 (Div. 2 Only)
Yandex.Algorithm Open 2011: Qualification 1
Yandex.Algorithm 2011: Qualification 2
Codeforces Beta Round 72 (Div. 1 Only)
Codeforces Beta Round 72 (Div. 2 Only)
Yandex.Algorithm 2011: Round 1
Yandex.Algorithm 2011: Round 2
Codeforces Beta Round 73 (Div. 1 Only)
Codeforces Beta Round 73 (Div. 2 Only)
Codeforces Beta Round 74 (Div. 1 Only)
Codeforces Beta Round 74 (Div. 2 Only)
Codeforces Beta Round 75 (Div. 1 Only)
Codeforces Beta Round 75 (Div. 2 Only)
Codeforces Beta Round 76 (Div. 1 Only)
Codeforces Beta Round 76 (Div. 2 Only)
Codeforces Beta Round 77 (Div. 1 Only)
Codeforces Beta Round 77 (Div. 2 Only)
Yandex.Algorithm 2011: Finals
Codeforces Beta Round 78 (Div. 1 Only)
Codeforces Beta Round 78 (Div. 2 Only)
Unknown Language Round 3
Codeforces Beta Round 79 (Div. 1 Only)
Codeforces Beta Round 79 (Div. 2 Only)
Codeforces Beta Round 80 (Div. 1 Only)
Codeforces Beta Round 80 (Div. 2 Only)
Codeforces Beta Round 81
Codeforces Beta Round 82 (Div. 2)
Codeforces Beta Round 83 (Div. 1 Only)
Codeforces Beta Round 83 (Div. 2 Only)
Codeforces Beta Round 84 (Div. 1 Only)
Codeforces Beta Round 84 (Div. 2 Only)
Codeforces Beta Round 85 (Div. 1 Only)
Codeforces Beta Round 85 (Div. 2 Only)
Codeforces Beta Round 86 (Div. 1 Only)
Codeforces Beta Round 86 (Div. 2 Only)
Codeforces Beta Round 87 (Div. 1 Only)
Codeforces Beta Round 87 (Div. 2 Only)
Codeforces Beta Round 88
Codeforces Beta Round 89 (Div. 2)
Codeforces Beta Round 90
School Regional Team Contest, Saratov, 2011
Codeforces Beta Round 91 (Div. 1 Only)
Codeforces Beta Round 91 (Div. 2 Only)
Codeforces Beta Round 92 (Div. 1 Only)
Codeforces Beta Round 92 (Div. 2 Only)
Codeforces Testing Round 2
Codeforces Beta Round 93 (Div. 1 Only)
Codeforces Beta Round 93 (Div. 2 Only)
Codeforces Beta Round 94 (Div. 1 Only)
Codeforces Beta Round 94 (Div. 2 Only)
Unknown Language Round 4
Codeforces Beta Round 95 (Div. 2)
Codeforces Beta Round 96 (Div. 1)
Codeforces Beta Round 96 (Div. 2)
Codeforces Testing Round 3
Codeforces Beta Round 97 (Div. 1)
Codeforces Beta Round 97 (Div. 2)
Codeforces Beta Round 98 (Div. 2)
Codeforces Beta Round 99 (Div. 1)
Codeforces Beta Round 99 (Div. 2)
Codeforces Round 100
Codeforces Round 101 (Div. 2)
Codeforces Round 102 (Div. 1)
Codeforces Round 102 (Div. 2)
Codeforces Round 103 (Div. 2)
Codeforces Round 104 (Div. 1)
Codeforces Round 104 (Div. 2)
Codeforces Testing Round 4
Codeforces Round 105 (Div. 2)
Codeforces Round 106 (Div. 2)
Codeforces Round 107 (Div. 1)
Codeforces Round 107 (Div. 2)
Codeforces Round 108 (Div. 2)
Surprise Language Round 5
Codeforces Round 109 (Div. 1)
Codeforces Round 109 (Div. 2)
Codeforces Round 110 (Div. 2)
VK Cup 2012 Qualification Round 1
VK Cup 2012 Qualification Round 2
Codeforces Round 111 (Div. 2)
VK Cup 2012 Round 1
VK Cup 2012 Wild-card Round 1
VK Cup 2012 Round 2
VK Cup 2012 Round 3
Codeforces Round 112 (Div. 2)
Codeforces Round 113 (Div. 2)
Codeforces Round 114 (Div. 1)
Codeforces Round 114 (Div. 2)
VK Cup 2012 Round 2 (Unofficial Div. 2 Edition)
April Fools Day Contest
Croc Champ 2012 - Qualification Round
Croc Champ 2012 - Round 1
VK Cup 2012 Round 3 (Unofficial Div. 2 Edition)
Codeforces Round 115
Croc Champ 2012 - Round 2
ABBYY Cup 2.0 - Easy
ABBYY Cup 2.0 - Hard
Codeforces Round 116 (Div. 2, ACM-ICPC Rules)
Croc Champ 2012 - Round 2 (Unofficial Div. 2 Edition)
Codeforces Round 117 (Div. 2)
Croc Champ 2012 - Final
Codeforces Round 118 (Div. 1)
Codeforces Round 118 (Div. 2)
Codeforces Round 119 (Div. 1)
Surprise Language Round 6
Codeforces Round 119 (Div. 2)
Codeforces Round 120 (Div. 2)
Codeforces Round 121 (Div. 1)
Codeforces Round 121 (Div. 2)
Codeforces Round 122 (Div. 1)
Codeforces Round 122 (Div. 2)
Codeforces Round 123 (Div. 2)
Codeforces Round 124 (Div. 1)
Codeforces Round 124 (Div. 2)
Codeforces Round 125 (Div. 1)
Codeforces Round 125 (Div. 2)
Codeforces Round 126 (Div. 2)
Codeforces Round 127 (Div. 1)
Codeforces Round 127 (Div. 2)
Codeforces Round 128 (Div. 2)
Codeforces Round 129 (Div. 1)
Codeforces Round 129 (Div. 2)
Abbyy Cup 2.0 - Final (unofficial)
Codeforces Round 130 (Div. 2)
VK Cup 2012 Finals, Practice Session
VK Cup 2012 Finals (unofficial online-version)
Codeforces Round 131 (Div. 1)
Codeforces Round 131 (Div. 2)
Codeforces Round 132 (Div. 2)
Codeforces Round 133 (Div. 2)
Codeforces Round 134 (Div. 1)
Codeforces Round 134 (Div. 2)
Codeforces Round 135 (Div. 2)
Codeforces Round 136 (Div. 1)
Codeforces Round 136 (Div. 2)
Codeforces Round 137 (Div. 2)
Codeforces Round 138 (Div. 1)
Codeforces Round 138 (Div. 2)
Codeforces Round 139 (Div. 2)
Codeforces Round 140 (Div. 1)
Codeforces Round 140 (Div. 2)
Codeforces Round 141 (Div. 2)
Codeforces Round 142 (Div. 1)
Codeforces Round 142 (Div. 2)
Codeforces Round 143 (Div. 2)
Codeforces Round 144 (Div. 1)
Codeforces Round 144 (Div. 2)
Codeforces Round 145 (Div. 2, ACM-ICPC Rules)
Codeforces Round 146 (Div. 1)
Codeforces Round 146 (Div. 2)
Codeforces Round 147 (Div. 2)
Codeforces Round 148 (Div. 1)
Codeforces Round 148 (Div. 2)
Codeforces Round 145 (Div. 1, ACM-ICPC Rules)
Bayan 2012-2013 Elimination Round (ACM ICPC Rules, English statements)
Codeforces Round 149 (Div. 2)
Codeforces Round 150 (Div. 1)
Codeforces Round 150 (Div. 2)
CROC-MBTU 2012, Elimination Round (ACM-ICPC)
Codeforces Round 151 (Div. 2)
Codeforces Round 152 (Div. 2)
Codeforces Round 152 (Div. 1)
CROC-MBTU 2012, Final Round (Online version, Div. 2)
Codeforces Round 153 (Div. 1)
Codeforces Round 153 (Div. 2)
Codeforces Round 154 (Div. 2)
Codeforces Round 155 (Div. 2)
Codeforces Round 156 (Div. 2)
Codeforces Round 156 (Div. 1)
Codeforces Round 159 (Div. 2)
Codeforces Round 157 (Div. 1)
Codeforces Round 157 (Div. 2)
Codeforces Round 158 (Div. 2)
Codeforces Round 160 (Div. 1)
Codeforces Round 160 (Div. 2)
Codeforces Round 161 (Div. 2)
Codeforces Round 162 (Div. 1)
Codeforces Round 162 (Div. 2)
Codeforces Round 163 (Div. 2)
Codeforces Testing Round 5
Codeforces Round 164 (Div. 2)
Codeforces Round 165 (Div. 1)
Codeforces Round 165 (Div. 2)
Codeforces Round 166 (Div. 2)
Codeforces Round 167 (Div. 2)
Codeforces Round 167 (Div. 1)
Codeforces Round 168 (Div. 1)
Codeforces Round 169 (Div. 2)
Codeforces Round 170 (Div. 1)
Codeforces Round 171 (Div. 2)
Codeforces Round 172 (Div. 1)
Codeforces Round 172 (Div. 2)
Codeforces Round 173 (Div. 2)
Codeforces Round 174 (Div. 1)
Codeforces Round 175 (Div. 2)
Codeforces Round 176 (Div. 1)
Codeforces Round 177 (Div. 1)
Codeforces Round 177 (Div. 2)
April Fools Day Contest 2013
Croc Champ 2013 - Qualification Round
Croc Champ 2013 - Round 1
Croc Champ 2013 - Round 2
Codeforces Round 178 (Div. 2)
Codeforces Round 179 (Div. 1)
Codeforces Round 179 (Div. 2)
Codeforces Round 180 (Div. 1)
Codeforces Round 181 (Div. 2)
Codeforces Round 182 (Div. 1)
Codeforces Round 182 (Div. 2)
Codeforces Round 183 (Div. 1)
Codeforces Round 183 (Div. 2)
Codeforces Round 184 (Div. 2)
Testing Round 6
Croc Champ 2013 - Finals (online version, Div. 1)
Codeforces Round 185 (Div. 1)
Codeforces Round 185 (Div. 2)
Codeforces Round 186 (Div. 2)
Codeforces Round 187 (Div. 1)
Codeforces Round 187 (Div. 2)
ABBYY Cup 3.0
Codeforces Round 188 (Div. 1)
Codeforces Round 189 (Div. 1)
Codeforces Round 189 (Div. 2)
Codeforces Round 190 (Div. 1)
Codeforces Round 190 (Div. 2)
Testing Round 7
MemSQL start[c]up Round 1
Codeforces Round 191 (Div. 2)
Testing Round 8
Codeforces Round 192 (Div. 1)
Codeforces Round 192 (Div. 2)
ABBYY Cup 3.0 - Finals (online version)
Codeforces Round 193 (Div. 2)
Codeforces Round 194 (Div. 1)
MemSQL start[c]up Round 2 - online version
Codeforces Round 195 (Div. 2)
Codeforces Round 196 (Div. 1)
Codeforces Round 197 (Div. 2)
Codeforces Round 198 (Div. 2)
Codeforces Round 198 (Div. 1)
Codeforces Round 199 (Div. 2)
Codeforces Round 200 (Div. 1)
Friday the 13th, Programmers Day
Codeforces Round 201 (Div. 1)
Codeforces Round 201 (Div. 2)
Codeforces Round 202 (Div. 1)
Codeforces Round 202 (Div. 2)
Codeforces Round 203 (Div. 2)
Codeforces Round 204 (Div. 1)
Codeforces Round 204 (Div. 2)
Codeforces Round 205 (Div. 2)
Codeforces Round 206 (Div. 1)
Codeforces Round 235 (Div. 2)
Codeforces Round 236 (Div. 2)
Codeforces Round 236 (Div. 1)
- CF 403D - Beautiful Pairs of Numbers
- CF 403E - Two Rooted Trees
Codeforces Round 237 (Div. 2)
Codeforces Round 238 (Div. 2)
Codeforces Round 238 (Div. 1)
Codeforces Round 239 (Div. 1)
April Fools Day Contest 2014
Coder-Strike 2014 - Qualification Round
Coder-Strike 2014 - Round 1
Coder-Strike 2014 - Round 2
Codeforces Round 240 (Div. 1)
Codeforces Round 240 (Div. 2)
Codeforces Round 241 (Div. 2)
RCC 2014 Warmup (Div. 2)
RCC 2014 Warmup (Div. 1)
Coder-Strike 2014 - Finals (online edition, Div. 1)
Coder-Strike 2014 - Finals (online edition, Div. 2)
Codeforces Round 242 (Div. 2)
Codeforces Round 243 (Div. 1)
Codeforces Round 243 (Div. 2)
Codeforces Round 244 (Div. 2)
Codeforces Round 245 (Div. 1)
Codeforces Round 245 (Div. 2)
Codeforces Round 247 (Div. 2)
Codeforces Round 246 (Div. 2)
Codeforces Round 248 (Div. 2)
Codeforces Round 249 (Div. 2)
Zepto Code Rush 2014
Codeforces Round 250 (Div. 2)
Codeforces Round 251 (Div. 2)
Testing Round 10
Codeforces Round 252 (Div. 2)
Codeforces Round 253 (Div. 1)
Codeforces Round 253 (Div. 2)
Codeforces Round 254 (Div. 1)
Codeforces Round 254 (Div. 2)
Codeforces Round #FF (Div. 1)
Codeforces Round #FF (Div. 2)
Codeforces Round 256 (Div. 2)
Codeforces Round 257 (Div. 1)
Codeforces Round 257 (Div. 2)
Codeforces Round 258 (Div. 2)
MemSQL Start[c]UP 2.0 - Round 1
Codeforces Round 259 (Div. 1)
Codeforces Round 259 (Div. 2)
Codeforces Round 260 (Div. 1)
Codeforces Round 260 (Div. 2)
MemSQL Start[c]UP 2.0 - Round 2
Codeforces Round 261 (Div. 2)
Codeforces Round 262 (Div. 2)
Codeforces Round 263 (Div. 1)
Codeforces Round 263 (Div. 2)
Codeforces Round 264 (Div. 2)
Codeforces Round 265 (Div. 1)
Codeforces Round 265 (Div. 2)
Codeforces Round 266 (Div. 2)
Codeforces Round 267 (Div. 2)
Codeforces Round 268 (Div. 1)
Codeforces Round 268 (Div. 2)
Surprise Language Round 7
Codeforces Round 269 (Div. 2)
Codeforces Round 270
Codeforces Round 271 (Div. 2)
Bayan 2015 Contest Warm Up
Codeforces Round 272 (Div. 2)
Codeforces Round 272 (Div. 1)
Codeforces Round 273 (Div. 2)
Codeforces Round 274 (Div. 2)
Codeforces Round 274 (Div. 1)
Codeforces Round 275 (Div. 1)
Codeforces Round 275 (Div. 2)
Codeforces Round 276 (Div. 1)
Codeforces Round 276 (Div. 2)
Codeforces Round 277 (Div. 2)
Codeforces Round 278 (Div. 1)
Codeforces Round 278 (Div. 2)
Codeforces Round 277.5 (Div. 2)
Codeforces Round 279 (Div. 2)
Testing Round 11
Codeforces Round 280 (Div. 2)
Codeforces Round 281 (Div. 2)
Codeforces Round 282 (Div. 1)
Codeforces Round 282 (Div. 2)
Codeforces Round 933 (Div. 3)
CodeTON Round 8 (Div. 1 + Div. 2, Rated, Prizes!)
Codeforces Round 934 (Div. 1)
Codeforces Round 934 (Div. 2)
Codeforces Round 935 (Div. 3)
Codeforces Round 936 (Div. 2)
Educational Codeforces Round 163 (Rated for Div. 2)
European Championship 2024 - Online Mirror (Unrated, ICPC Rules, Teams Preferred)
Codeforces Round 937 (Div. 4)
Codeforces Global Round 25
April Fools Day Contest 2024
2023 Post World Finals Online ICPC Challenge powered by Huawei
Educational Codeforces Round 164 (Rated for Div. 2)
Codeforces Round 938 (Div. 3)
Codeforces Round 939 (Div. 2)
Codeforces Round 940 (Div. 2) and CodeCraft-23
Kotlin Heroes: Episode 10
Codeforces Round 941 (Div. 1)
Codeforces Round 941 (Div. 2)
Codeforces Round 942 (Div. 1)
Codeforces Round 943 (Div. 3)
Codeforces Round 942 (Div. 2)
Codeforces Round 945 (Div. 2)
Codeforces Round 946 (Div. 3)
Codeforces Round 947 (Div. 1 + Div. 2)
Educational Codeforces Round 166 (Rated for Div. 2)
Codeforces Round 1091 (Div. 2) and CodeCraft 26
Codeforces Round 1090 (Div. 4)
Codeforces Round 1093 (Div. 1)
Spectral::Cup 2026 Round 1 (Codeforces Round 1094, Div. 1 + Div. 2)
Educational Codeforces Round 189 (Rated for Div. 2)
Codeforces Round 1095 (Div. 2)
Codeforces Round 1096 (Div. 3)

Practice › Codeforces Solutions › Codeforces Round 236 (Div. 1) › CF 403D - Beautiful Pairs of Numbers

CF 403D - Beautiful Pairs of Numbers

Codeforces 403D: Beautiful Pairs of Numbers

codeforces competitive-programming combinatorics dp

CF 403D - Beautiful Pairs of Numbers

Rating: 2300
Tags: combinatorics, dp
Solve time: 51s
Verified: no

Solution

Next → CF 403E - Two Rooted Trees

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