| 1 |
Combinations |
UVA |
|
|
1 |
| 2 |
Pasha and Stick |
Codeforces |
|
Codeforces Round #337 (Div. 2) |
1 |
| 3 |
Permutations |
SPOJ |
|
|
1 |
| 4 |
Dreamoon and WiFi |
Codeforces |
|
Codeforces Round #272 (Div. 2) |
1 |
| 5 |
Paths on a Grid |
PKU |
|
|
1 |
| 6 |
Cipher |
PKU |
|
|
1 |
| 7 |
Lucky Numbers |
Codeforces |
|
Experimental Educational Round: VolBIT Formulas Blitz |
1 |
| 8 |
Random Teams |
Codeforces |
|
Codeforces Round #273 (Div. 2) |
1 |
| 9 |
Wooden Sticks |
PKU |
|
|
1 |
| 10 |
Brick Wall Patterns |
UVA |
|
|
1 |
| 11 |
Chocolate |
Codeforces |
|
Codeforces Round #340 (Div. 2) |
1 |
| 12 |
DNA Sorting |
PKU |
|
|
1 |
| 13 |
Round Numbers |
PKU |
|
|
1 |
| 14 |
Triangle Counting |
UVA |
|
|
1 |
| 15 |
Wet Shark and Bishops |
Codeforces |
|
Codeforces Round #341 (Div. 2) |
1 |
| 16 |
Marbles |
SPOJ |
|
|
1 |
| 17 |
Number Sequence |
PKU |
|
|
1 |
| 18 |
Mashmokh and ACM |
Codeforces |
|
Codeforces Round #240 (Div. 1) & Codeforces Round #240 (Div. 2) |
1 |
| 19 |
The World is a Theatre |
Codeforces |
|
Codeforces Beta Round #95 (Div. 2) |
2 |
| 20 |
Ciel and Flowers |
Codeforces |
|
Codeforces Round #190 (Div. 2) |
2 |
| 21 |
Leha and Function |
Codeforces |
|
Codeforces Round #429 (Div. 1) & Codeforces Round #429 (Div. 2) |
2 |
| 22 |
Pocket Book |
Codeforces |
|
Codeforces Round #108 (Div. 2) |
2 |
| 23 |
How many nodes ? |
UVA |
|
|
2 |
| 24 |
Necklace of Beads |
PKU |
|
|
2 |
| 25 |
Trees Made to Order |
PKU |
|
|
2 |
| 26 |
Modulo Sum |
Codeforces |
|
Codeforces Round #319 (Div. 2) |
2 |
| 27 |
Points on Line |
Codeforces |
|
Codeforces Round #153 (Div. 1) & Codeforces Round #153 (Div. 2) |
2 |
| 28 |
Color |
PKU |
|
|
2 |
| 29 |
Mr. Kitayuta's Gift |
Codeforces |
|
Codeforces Round #286 (Div. 1) & Codeforces Round #286 (Div. 2) & Codeforces Round #286 (Div. 1) & Codeforces Round #286 (Div. 2) |
2 |
| 30 |
Count the Trees |
UVA |
|
|
2 |
| 31 |
Kolya and Tanya |
Codeforces |
|
Codeforces Round #324 (Div. 2) |
2 |
| 32 |
Yet another Number Sequence |
UVA |
|
|
2 |
| 33 |
Safe Salutations |
UVA |
|
|
2 |
| 34 |
Code |
PKU |
|
|
2 |
| 35 |
Candy Distribution |
PKU |
|
|
2 |
| 36 |
Permutations |
UVA |
|
|
2 |
| 37 |
Choose and divide |
UVA |
|
|
2 |
| 38 |
Kyoya and Colored Balls |
Codeforces |
|
Codeforces Round #309 (Div. 1) & Codeforces Round #309 (Div. 2) |
2 |
| 39 |
How Many Trees? |
UVA |
|
|
2 |
| 40 |
Let it Bead |
PKU |
|
|
2 |
| 41 |
Lucky tickets |
PKU |
|
|
3 |
| 42 |
A decorative fence |
PKU |
|
|
3 |
| 43 |
Binomial Theorem |
UVA |
|
|
3 |
| 44 |
Little Elephant and Interval |
Codeforces |
|
Codeforces Round #129 (Div. 1) & Codeforces Round #129 (Div. 2) |
3 |
| 45 |
Magic Bracelet |
PKU |
|
|
3 |
| 46 |
Card Game |
SPOJ |
|
|
3 |
| 47 |
Longge's problem |
PKU |
|
|
3 |
| 48 |
Selection of Personnel |
Codeforces |
|
Experimental Educational Round: VolBIT Formulas Blitz |
3 |
| 49 |
Expression Bracketing |
UVA |
|
|
3 |
| 50 |
Cow Sorting |
PKU |
|
|
3 |
| 51 |
Ilya and Escalator |
Codeforces |
|
Codeforces Round #293 (Div. 2) |
3 |
| 52 |
Pashmak and Buses |
Codeforces |
|
Codeforces Round #261 (Div. 2) |
3 |
| 53 |
Connected Graph |
PKU |
|
|
3 |
| 54 |
Hamming Distance Sum |
Codeforces |
|
Codeforces Round #336 (Div. 2) |
3 |
| 55 |
Burger |
UVA |
|
|
3 |
| 56 |
Unbearable Controversy of Being |
Codeforces |
|
Codeforces Round #277.5 (Div. 2) |
3 |
| 57 |
CARDS |
PKU |
|
|
4 |
| 58 |
Benches |
Codeforces |
|
Experimental Educational Round: VolBIT Formulas Blitz |
4 |
| 59 |
Beautiful Numbers |
Codeforces |
|
Codeforces Round #181 (Div. 2) |
4 |
| 60 |
Directed Roads |
Codeforces |
|
Codeforces Round #369 (Div. 2) |
4 |
| 61 |
Inna and Nine |
Codeforces |
|
Codeforces Round #220 (Div. 2) |
4 |
| 62 |
Tourist Problem |
Codeforces |
|
Codeforces Round #198 (Div. 2) & Codeforces Round #198 (Div. 1) |
4 |
| 63 |
Difference between Triplets |
PKU |
|
|
4 |
| 64 |
New Year Santa Network |
Codeforces |
|
Good Bye 2014 |
4 |
| 65 |
Ralph And His Magic Field |
Codeforces |
|
Codeforces Round #447 (Div. 2) |
4 |
| 66 |
Dima and Sequence |
Codeforces |
|
Codeforces Round #167 (Div. 2) |
4 |
| 67 |
Magic Five |
Codeforces |
|
Codeforces Round #191 (Div. 2) |
4 |
| 68 |
The Stable Marriage Problem |
PKU |
|
|
4 |
| 69 |
Weather |
Codeforces |
|
Codeforces Round #145 (Div. 2, ACM-ICPC Rules) |
4 |
| 70 |
Matrix |
Codeforces |
|
Codeforces Round #213 (Div. 1) & Codeforces Round #213 (Div. 2) |
4 |
| 71 |
Polo the Penguin and Houses |
Codeforces |
|
Codeforces Round #177 (Div. 1) |
4 |
| 72 |
Gerald and Giant Chess |
Codeforces |
|
Codeforces Round #313 (Div. 1) & Codeforces Round #313 (Div. 2) |
4 |
| 73 |
FUN WITH NUMBERS |
SPOJ |
|
|
4 |
| 74 |
The Intriguing Obsession |
Codeforces |
|
Codeforces Round #439 (Div. 2) |
4 |
| 75 |
Star |
Codeforces |
|
April Fools Day Contest |
4 |
| 76 |
Vanya and Triangles |
Codeforces |
|
Codeforces Round #308 (Div. 2) |
4 |
| 77 |
Quantity of Strings |
Codeforces |
|
Codeforces Round #107 (Div. 1) & Codeforces Round #107 (Div. 2) |
4 |
| 78 |
Leonardo's Notebook |
PKU |
|
|
4 |
| 79 |
How many trees? |
Codeforces |
|
Codeforces Beta Round #9 (Div. 2 Only) |
5 |
| 80 |
Increase Sequence |
Codeforces |
|
Codeforces Round #266 (Div. 2) |
5 |
| 81 |
Kyoya and Permutation |
Codeforces |
|
Codeforces Round #309 (Div. 1) & Codeforces Round #309 (Div. 2) |
5 |
| 82 |
Mashmokh and Reverse Operation |
Codeforces |
|
Codeforces Round #240 (Div. 1) & Codeforces Round #240 (Div. 2) |
5 |
| 83 |
Shaass and Lights |
Codeforces |
|
Codeforces Round #178 (Div. 2) |
5 |
| 84 |
Jerry's Protest |
Codeforces |
|
8VC Venture Cup 2016 - Elimination Round |
5 |
| 85 |
Anton and School - 2 |
Codeforces |
|
Codeforces Round #404 (Div. 2) |
5 |
| 86 |
Cycles |
Codeforces |
|
Codeforces Round #144 (Div. 1) & Codeforces Round #144 (Div. 2) |
5 |
| 87 |
Vitaly and Cycle |
Codeforces |
|
Codeforces Round #311 (Div. 2) |
5 |
| 88 |
Symmetric and Transitive |
Codeforces |
|
Codeforces Round #315 (Div. 1) & Codeforces Round #315 (Div. 2) |
5 |
| 89 |
Basketball Team |
Codeforces |
|
Codeforces Beta Round #83 (Div. 1 Only) & Codeforces Beta Round #83 (Div. 2 Only) |
5 |
| 90 |
Iahub and Permutations |
Codeforces |
|
Codeforces Round #198 (Div. 2) & Codeforces Round #198 (Div. 1) |
5 |
| 91 |
Winter is here |
Codeforces |
|
Codeforces Round #428 (Div. 2) |
5 |
| 92 |
Roman and Numbers |
Codeforces |
|
Codeforces Round #235 (Div. 2) |
5 |
| 93 |
Regetni |
PKU |
|
|
5 |
| 94 |
Permutations |
Codeforces |
|
Codeforces Beta Round #92 (Div. 2 Only) |
5 |
| 95 |
The shuffle Problem |
PKU |
|
|
5 |
| 96 |
Jeff and Furik |
Codeforces |
|
Codeforces Round #204 (Div. 1) & Codeforces Round #204 (Div. 2) |
5 |
| 97 |
Prime Factors |
Live Archive |
1997 |
North America - East Central NA |
5 |
| 98 |
Dima and Two Sequences |
Codeforces |
|
Codeforces Round #167 (Div. 2) & Codeforces Round #167 (Div. 1) |
5 |
| 99 |
Malek Dance Club |
Codeforces |
|
Codeforces Round #189 (Div. 1) & Codeforces Round #189 (Div. 2) |
5 |
| 100 |
Games with Rectangle |
Codeforces |
|
Codeforces Beta Round #94 (Div. 1 Only) & Codeforces Beta Round #94 (Div. 2 Only) |
5 |
| 101 |
Weird journey |
Codeforces |
|
Codeforces Round #407 (Div. 1) & Codeforces Round #407 (Div. 2) |
5 |
| 102 |
Lengthening Sticks |
Codeforces |
|
Codeforces Round #317 [AimFund Thanks-Round] (Div. 1) & Codeforces Round #317 [AimFund Thanks-Round] (Div. 2) |
5 |
| 103 |
Two Heaps |
Codeforces |
|
Codeforces Round #205 (Div. 2) |
5 |
| 104 |
Square Subsets |
Codeforces |
|
Codeforces Round #448 (Div. 2) |
5 |
| 105 |
Jzzhu and Numbers |
Codeforces |
|
Codeforces Round #257 (Div. 1) |
6 |
| 106 |
Sum of powers |
PKU |
|
|
6 |
| 107 |
Little Elephant and Elections |
Codeforces |
|
Codeforces Round #157 (Div. 1) & Codeforces Round #157 (Div. 2) |
6 |
| 108 |
Array |
Codeforces |
|
Codeforces Beta Round #53 |
6 |
| 109 |
Bots |
Codeforces |
|
Bubble Cup 8 - Finals [Online Mirror] |
6 |
| 110 |
Mike and Geometry Problem |
Codeforces |
|
Codeforces Round #361 (Div. 2) |
6 |
| 111 |
Lucky Permutation |
Codeforces |
|
Codeforces Beta Round #91 (Div. 1 Only) & Codeforces Beta Round #91 (Div. 2 Only) |
6 |
| 112 |
Compartments |
Codeforces |
|
Codeforces Round #207 (Div. 1) & Codeforces Round #207 (Div. 2) |
6 |
| 113 |
ETS Problem setting |
UVA |
|
|
6 |
| 114 |
Special Matrices |
Codeforces |
|
Codeforces Round #277.5 (Div. 2) |
6 |
| 115 |
Devu and Flowers |
Codeforces |
|
Codeforces Round #258 (Div. 2) |
6 |
| 116 |
Birthday Cake |
PKU |
|
|
6 |
| 117 |
Pluses everywhere |
Codeforces |
|
Codeforces Round #295 (Div. 2) & Codeforces Round #295 (Div. 1) |
6 |
| 118 |
Cipher |
Codeforces |
|
Codeforces Round #110 (Div. 1) & Codeforces Round #110 (Div. 2) |
6 |
| 119 |
Parking Lot |
Codeforces |
|
Experimental Educational Round: VolBIT Formulas Blitz |
6 |
| 120 |
Permutation Sum |
Codeforces |
|
Codeforces Round #175 (Div. 2) |
6 |
| 121 |
Lucky Subsequence |
Codeforces |
|
Codeforces Round #104 (Div. 1) & Codeforces Round #104 (Div. 2) |
6 |
| 122 |
Random Task |
Codeforces |
|
Codeforces Round #247 (Div. 2) |
6 |
| 123 |
Magic Trick |
Codeforces |
|
MemSQL Start[c]UP 2.0 - Round 1 |
6 |
| 124 |
Greg and Friends |
Codeforces |
|
Codeforces Round #179 (Div. 1) & Codeforces Round #179 (Div. 2) |
6 |
| 125 |
Partial Sums |
Codeforces |
|
Codeforces Round #138 (Div. 1) & Codeforces Round #138 (Div. 2) |
6 |
| 126 |
Little Elephant and LCM |
Codeforces |
|
Codeforces Round #157 (Div. 1) & Codeforces Round #157 (Div. 2) |
6 |
| 127 |
GukiZ and Binary Operations |
Codeforces |
|
Codeforces Round #307 (Div. 2) |
6 |
| 128 |
Table |
Codeforces |
|
Codeforces Round #144 (Div. 1) & Codeforces Round #144 (Div. 2) |
6 |
| 129 |
Numbers |
Codeforces |
|
Codeforces Round #131 (Div. 1) & Codeforces Round #131 (Div. 2) |
6 |
| 130 |
Pig and Palindromes |
Codeforces |
|
Codeforces Round #316 (Div. 2) |
6 |
| 131 |
Unusual Sequences |
Codeforces |
|
Codeforces Round #450 (Div. 2) |
6 |
| 132 |
Memory and Scores |
Codeforces |
|
Codeforces Round #370 (Div. 2) |
6 |
| 133 |
Triangles |
Codeforces |
|
Codeforces Round #142 (Div. 1) & Codeforces Round #142 (Div. 2) |
6 |
| 134 |
Challenge Pennants |
Codeforces |
|
Experimental Educational Round: VolBIT Formulas Blitz |
6 |
| 135 |
Fence Divercity |
Codeforces |
|
Codeforces Round #346 (Div. 2) |
7 |
| 136 |
Ski Base |
Codeforces |
|
Codeforces Beta Round #75 (Div. 1 Only) & Codeforces Beta Round #75 (Div. 2 Only) |
7 |
| 137 |
????? |
PKU |
|
|
7 |
| 138 |
Chessboard Billiard |
Codeforces |
|
Codeforces Beta Round #68 |
7 |
| 139 |
Plato's Blocks |
PKU |
|
|
7 |
| 140 |
Levko and Strings |
Codeforces |
|
Codeforces Round #210 (Div. 1) & Codeforces Round #210 (Div. 2) |
7 |
| 141 |
Square Root of Permutation |
Codeforces |
|
Educational Codeforces Round 4 |
7 |
| 142 |
On Number of Decompositions into Multipliers |
Codeforces |
|
Codeforces Round #232 (Div. 1) & Codeforces Round #232 (Div. 2) |
7 |
| 143 |
Axis Walking |
Codeforces |
|
Codeforces Round #191 (Div. 2) |
7 |
| 144 |
On the Bench |
Codeforces |
|
Codeforces Round #429 (Div. 1) & Codeforces Round #429 (Div. 2) |
7 |
| 145 |
String Mark |
Codeforces |
|
Codeforces Round #448 (Div. 2) |
7 |
| 146 |
The table |
Codeforces |
|
Codeforces Round #140 (Div. 1) |
7 |
| 147 |
Beautiful Pairs of Numbers |
Codeforces |
|
Codeforces Round #236 (Div. 1) |
7 |
| 148 |
Devu and Birthday Celebration |
Codeforces |
|
Codeforces Round #251 (Div. 2) |
7 |
| 149 |
Vasily the Bear and Beautiful Strings |
Codeforces |
|
Codeforces Round #195 (Div. 2) |
7 |
| 150 |
Right Triangles |
Codeforces |
|
Codeforces Testing Round #1 |
7 |
| 151 |
Yaroslav and Two Strings |
Codeforces |
|
Codeforces Round #179 (Div. 2) |
7 |
| 152 |
Dima and Horses |
Codeforces |
|
Codeforces Round #167 (Div. 2) & Codeforces Round #167 (Div. 1) |
7 |
| 153 |
Black-and-White Cube |
Codeforces |
|
Testing Round #7 |
8 |
| 154 |
Distinct Paths |
Codeforces |
|
Croc Champ 2013 - Round 2 |
8 |
| 155 |
Gifts |
Codeforces |
|
Codeforces Round #142 (Div. 1) |
8 |
| 156 |
Cow Tennis Tournament |
Codeforces |
|
Codeforces Round #174 (Div. 1) |
8 |
| 157 |
New Year Garland |
Codeforces |
|
Codeforces Round #100 |
8 |
| 158 |
Different Subsets For All Tuples |
Codeforces |
|
Educational Codeforces Round 11 |
8 |
| 159 |
Olya and Graph |
Codeforces |
|
Codeforces Round #184 (Div. 2) |
8 |
| 160 |
Brackets |
Codeforces |
|
Codeforces Beta Round #92 (Div. 1 Only) & Codeforces Beta Round #92 (Div. 2 Only) |
8 |
| 161 |
Find a car |
Codeforces |
|
Codeforces Round #415 (Div. 1) & Codeforces Round #415 (Div. 2) |
8 |
| 162 |
An unavoidable detour for home |
Codeforces |
|
Codeforces Round #418 (Div. 2) |
8 |
| 163 |
Hexagonal Routes |
PKU |
|
|
8 |
| 164 |
Clues |
Codeforces |
|
Codeforces Round #110 (Div. 1) |
8 |
| 165 |
Parquet |
Codeforces |
|
Codeforces Beta Round #26 (Codeforces format) |
8 |
| 166 |
Cowslip Collections |
Codeforces |
|
CROC 2016 - Elimination Round |
8 |
| 167 |
Codeword |
Codeforces |
|
Codeforces Round #349 (Div. 1) |
8 |
| 168 |
Misha and Palindrome Degree |
Codeforces |
|
Codeforces Round #285 (Div. 2) & Codeforces Round #285 (Div. 1) |
8 |
| 169 |
The Child and Binary Tree |
Codeforces |
|
Codeforces Round #250 (Div. 1) |
8 |
| 170 |
Greg and Caves |
Codeforces |
|
Codeforces Round #179 (Div. 1) |
8 |
| 171 |
Petya and Coloring |
Codeforces |
|
Codeforces Beta Round #85 (Div. 1 Only) |
8 |
| 172 |
Tickets |
Codeforces |
|
Codeforces Beta Round #26 (Codeforces format) |
8 |
| 173 |
Sereja and Intervals |
Codeforces |
|
Codeforces Round #215 (Div. 1) |
8 |
| 174 |
Number Challenge |
Codeforces |
|
Codeforces Round #146 (Div. 1) |
8 |
| 175 |
Polo the Penguin and Trees |
Codeforces |
|
Codeforces Round #177 (Div. 1) |
8 |
| 176 |
Periodical Numbers |
Codeforces |
|
Codeforces Round #132 (Div. 2) |
8 |
| 177 |
Number Table |
Codeforces |
|
Codeforces Beta Round #39 |
8 |
| 178 |
Vowels |
Codeforces |
|
Codeforces Round #225 (Div. 1) |
8 |
| 179 |
Playing with Superglue |
Codeforces |
|
Croc Champ 2012 - Round 2 |
8 |
| 180 |
Bath Queue |
Codeforces |
|
Codeforces Beta Round #28 (Codeforces format) |
8 |
| 181 |
Positions in Permutations |
Codeforces |
|
Codeforces Round #175 (Div. 2) |
8 |
| 182 |
Bitonix' Patrol |
Codeforces |
|
Codeforces Round #134 (Div. 1) |
9 |
| 183 |
Transforming Sequence |
Codeforces |
|
AIM Tech Round (Div. 1) |
9 |
| 184 |
Pasha and Pipe |
Codeforces |
|
Codeforces Round #293 (Div. 2) |
9 |
| 185 |
Yet Another Number Sequence |
Codeforces |
|
Codeforces Round #230 (Div. 1) & Codeforces Round #230 (Div. 2) |
9 |
| 186 |
Thoroughly Bureaucratic Organization |
Codeforces |
|
Codeforces Round #127 (Div. 1) |
9 |
| 187 |
Singer House |
Codeforces |
|
Codeforces Round #424 (Div. 1, rated, based on VK Cup Finals) |
9 |
| 188 |
Lesson Timetable |
Codeforces |
|
Codeforces Beta Round #37 |
9 |
| 189 |
Flags |
Codeforces |
|
Codeforces Beta Round #76 (Div. 1 Only) |
9 |
| 190 |
The Red Button |
Codeforces |
|
MemSQL start[c]up Round 1 |
9 |
| 191 |
Little Elephant and Triangle |
Codeforces |
|
Codeforces Round #136 (Div. 1) |
9 |
| 192 |
Research Rover |
Codeforces |
|
Intel Code Challenge Elimination Round (Div. 1 + Div. 2, combined) |
9 |
| 193 |
Triangles |
Codeforces |
|
Codeforces Beta Round #15 |
9 |
| 194 |
On Sum of Number of Inversions in Permutations |
Codeforces |
|
Codeforces Round #232 (Div. 1) |
9 |
| 195 |
Sereja and Cinema |
Codeforces |
|
Codeforces Round #223 (Div. 1) |
9 |
| 196 |
White, Black and White Again |
Codeforces |
|
Testing Round #6 |
9 |
| 197 |
Pentagon |
Codeforces |
|
Codeforces Beta Round #48 |
9 |
| 198 |
Lucky Pair |
Codeforces |
|
Codeforces Round #104 (Div. 1) |
9 |
| 199 |
Ksenia and Combinatorics |
Codeforces |
|
Codeforces Round #224 (Div. 2) |
9 |
| 200 |
Lust |
Codeforces |
|
Codeforces Round #446 (Div. 1) |
9 |
| 201 |
Present for Vitalik the Philatelist |
Codeforces |
|
Codeforces Round #325 (Div. 1) |
9 |
| 202 |
Random Function and Tree |
Codeforces |
|
Codeforces Round #275 (Div. 1) |
9 |
| 203 |
Move by Prime |
Codeforces |
|
IndiaHacks 2016 - Online Edition (Div. 1 + Div. 2) |
9 |
| 204 |
Randomizer |
Codeforces |
|
Codeforces Round #313 (Div. 1) |
9 |
| 205 |
Karen and Cards |
Codeforces |
|
Codeforces Round #419 (Div. 1) |
9 |
| 206 |
Drawing Circles is Fun |
Codeforces |
|
Codeforces Round #219 (Div. 1) |
10 |
| 207 |
Vasily the Bear and Painting Square |
Codeforces |
|
Codeforces Round #195 (Div. 2) |
10 |
| 208 |
Numbers on the blackboard |
Codeforces |
|
Codeforces Round #443 (Div. 1) |
10 |
| 209 |
Shake It! |
Codeforces |
|
Codeforces Round #431 (Div. 1) |
10 |
| 210 |
Toys |
Codeforces |
|
School Team Contest #2 (Winter Computer School 2010/11) |
10 |
| 211 |
Nephren Runs a Cinema |
Codeforces |
|
Codeforces Round #449 (Div. 1) |
10 |
| 212 |
Bingo! |
Codeforces |
|
MemSQL Start[c]UP 2.0 - Round 2 |
10 |
| 213 |
Days of Floral Colours |
Codeforces |
|
Codeforces Round #431 (Div. 1) |
10 |
| 214 |
Sleeping |
Codeforces |
|
Codeforces Beta Round #86 (Div. 1 Only) |
10 |
| 215 |
Weak Subsequence |
Codeforces |
|
Codeforces Beta Round #97 (Div. 1) |
10 |