Problemset - Codeforces

→ Pay attention

Before contest
XIX Open Olympiad in Informatics - Final Stage, Day 1 (Unrated, Online Mirror, IOI rules)
3 days

→ Filter Problems

Difficulty: —

Add tag

Problems

#	Name
271C	Secret constructive algorithms, implementation	1500	x3022
271B	Prime Matrix binary search, brute force, math, number theory	1300	x13560
271A	Beautiful Year brute force	800	x149137
270B	Multithreading data structures, greedy, implementation	1400	x4214
270A	Fancy Fence geometry, implementation, math	1100	x46888
269E	String Theory geometry, math, strings	3100	x112
269D	Maximum Waterfall data structures, dp, graphs, sortings	2600	x466
269C	Flawed Flow constructive algorithms, flows, graphs, greedy	2100	x1702
269B	Greenhouse Effect dp	1700	x6456
269A	Magical Boxes greedy, math	1600	x3565
268E	Playlist math, probabilities, sortings	2100	x1035
268D	Wall Bars dp	2300	x517
268C	Beautiful Sets of Points constructive algorithms, implementation	1500	x13898
268B	Buttons implementation, math	1000	x33465
268A	Games brute force	800	x91215
267C	Berland Traffic math, matrices	2700	x168
267B	Dominoes dfs and similar, graphs	2000	x662
267A	Subtractions math, number theory	900	x7912
266E	More Queries to Array... data structures, math	2500	x945
266D	BerDonalds graphs, math, shortest paths	2400	x912
266C	Below the Diagonal constructive algorithms, greedy, math	2100	x1374
266B	Queue at the School constructive algorithms, graph matchings, implementation, shortest paths	800	x143457
266A	Stones on the Table implementation	800	x204439
265B	Roadside Trees (Simplified Edition) greedy, implementation	1000	x17401
265A	Colorful Stones (Simplified Edition) implementation	800	x38438
264E	Roadside Trees data structures, dp	3000	x440
264D	Colorful Stones dp, two pointers	2500	x426
264C	Choosing Balls dp	2000	x3034
264B	Good Sequences dp, number theory	1500	x10746
264A	Escape from Stones constructive algorithms, data structures, implementation, two pointers	1200	x11044
263E	Rhombus brute force, data structures, dp	2500	x414
263D	Cycle in Graph dfs and similar, graphs	1800	x3702
263C	Circle of Numbers brute force, dfs and similar, implementation	2000	x1098
263B	Squares greedy, implementation, sortings	900	x9112
263A	Beautiful Matrix implementation	800	x262748
262B	Roma and Changing Signs greedy	1200	x11611
262A	Roma and Lucky Numbers implementation	800	x20410
261E	Maxim and Calculator brute force, dp, two pointers	2800	x419
261D	Maxim and Increasing Subsequence dp	2600	x589
261C	Maxim and Matrix constructive algorithms, dp, math	2000	x782
261B	Maxim and Restaurant dp, math, probabilities	1900	x1430
261A	Maxim and Discounts greedy, sortings	1400	x5336
260E	Dividing Kingdom binary search, brute force, data structures	2500	x468
260D	Black and White Tree constructive algorithms, dsu, graphs, greedy, trees	2100	x1576
260C	Balls and Boxes constructive algorithms, greedy, implementation	1700	x3010
260B	Ancient Prophesy brute force, implementation, strings	1600	x3886
260A	Adding Digits implementation, math	1400	x15294
259B	Little Elephant and Magic Square brute force, implementation	1100	x14207
259A	Little Elephant and Chess brute force, strings	1000	x9334
258E	Little Elephant and Tree data structures, dfs and similar, trees	2400	x1163
258D	Little Elephant and Broken Sorting dp, math, probabilities	2600	x1303
258C	Little Elephant and LCM binary search, combinatorics, dp, math	2000	x1809
258B	Little Elephant and Elections brute force, combinatorics, dp	1900	x1459
258A	Little Elephant and Bits greedy, math	1100	x23719
257E	Greedy Elevator data structures, implementation	2200	x303
257D	Sum greedy, math	1900	x1640
257C	View Angle brute force, geometry, math	1800	x4445
257B	Playing Cubes games, greedy, implementation	1300	x7312
257A	Sockets greedy, implementation, sortings	1100	x6586
256E	Lucky Arrays data structures	2400	x678
256D	Liars and Serge dp	2700	x262
255E	Furlo and Rublo and Game games, implementation, math	2200	x882
255D	Mr. Bender and Square binary search, implementation, math	1800	x2044
255C	Almost Arithmetical Progression brute force, dp	1500	x4793
255B	Code Parsing implementation	1200	x5046
255A	Greg's Workout implementation	800	x29403
254E	Dormitory dp, implementation	2100	x696
254D	Rats brute force, dfs and similar, graphs, implementation, shortest paths	2300	x587
254C	Anagram greedy, strings	1800	x1509
254B	Jury Size brute force, implementation	1500	x2165
254A	Cards with Numbers constructive algorithms, sortings	1200	x7223
253E	Printer binary search, data structures, implementation, sortings	2200	x558
253D	Table with Letters - 2 brute force, two pointers	2000	x858
253C	Text Editor data structures, dfs and similar, graphs, greedy, shortest paths	1600	x2690
253B	Physics Practical binary search, dp, sortings, two pointers	1400	x11047
253A	Boys and Girls greedy	1100	x11484
252B	Unsorting Array brute force, sortings	1800	x1731
252A	Little Xor brute force, implementation	1100	x5428
251E	Tree and Table dfs and similar, dp, implementation, trees	3000	x179
251D	Two Sets bitmasks, math	2700	x485
251C	Number Transformation dp, greedy, number theory	2000	x1054
251B	Playing with Permutations implementation, math	1800	x1284
251A	Points on Line binary search, combinatorics, two pointers	1300	x18467
250E	Mad Joe brute force	2000	x476
250D	Building Bridge geometry, ternary search, two pointers	1900	x921
250C	Movie Critics greedy	1600	x2051
250B	Restoring IPv6 implementation, strings	1500	x2019
250A	Paper Work greedy	1000	x4219
249E	Endless Matrix math	2600	x334
249D	Donkey and Stars data structures, dp, geometry, math, sortings	2700	x473
248E	Piglet's Birthday dp, math, probabilities	2600	x599
248D	Sweets for Everyone! binary search, greedy, implementation	2300	x504
248C	Robo-Footballer binary search, geometry	2000	x858
248B	Chilly Willy math, number theory	1400	x5426
248A	Cupboards implementation	800	x23153
246E	Blood Cousins Return binary search, data structures, dfs and similar, dp, sortings	2400	x3555
246D	Colorful Graph brute force, dfs and similar, graphs	1600	x9610
246C	Beauty Pageant brute force, constructive algorithms, greedy	1600	x2664
246B	Increase and Decrease greedy, math	1300	x11555
246A	Buggy Sorting constructive algorithms, greedy, sortings	900	x9449