Problemset - Codeforces

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Educational Codeforces Round 81 (Rated for Div. 2)
5 days

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Problems

#	Name
1252B	Cleaning Robots dp, trees	2600	x303
1252A	Copying Homework	1000	x3281
1251F	Red-White Fence combinatorics, fft	2600	x262
1251E2	Voting (Hard Version) binary search, data structures, greedy	2300	x1103
1251E1	Voting (Easy Version) data structures, dp, greedy	2200	x1025
1251D	Salary Changing binary search, greedy, sortings	1800	x2926
1251C	Minimize The Integer greedy, two pointers	1500	x5455
1251B	Binary Palindromes greedy, strings	1400	x6039
1251A	Broken Keyboard brute force, strings, two pointers	1000	x9302
1250N	Wires dfs and similar, graphs, greedy	2200	x978
1250M	SmartGarden constructive algorithms, divide and conquer	2700	x242
1250L	Divide The Students binary search, greedy, math	1700	x1870
1250K	Projectors flows, graphs	3200	x55
1250J	The Parade binary search, greedy	1900	x1408
1250I	Show Must Go On binary search, brute force, greedy, shortest paths	3100	x88
1250H	Happy Birthday math	1500	x2106
1250G	Discarding Game dp, greedy, two pointers	2400	x492
1250F	Data Center brute force, implementation	1000	x3122
1250E	The Coronation graphs, implementation	2500	x499
1250D	Conference Problem dp	3100	x59
1250C	Trip to Saint Petersburg data structures	2300	x840
1250B	The Feast and the Bus brute force, constructive algorithms, greedy, math	1900	x1469
1250A	Berstagram implementation	1400	x2214
1249F	Maximum Weight Subset dp, trees	2500	x840
1249E	By Elevator or Stairs? dp, shortest paths	1700	x4013
1249D2	Too Many Segments (hard version) data structures, greedy, sortings	2000	x2329
1249D1	Too Many Segments (easy version) greedy	1900	x2419
1249C2	Good Numbers (hard version) binary search, greedy, math, meet-in-the-middle	1500	x5918
1249C1	Good Numbers (easy version) brute force, greedy, implementation	1300	x7461
1249B2	Books Exchange (hard version) dfs and similar, dsu, math	1300	x7709
1249B1	Books Exchange (easy version) dsu, math	1000	x10261
1249A	Yet Another Dividing into Teams math	900	x12748
1248D1	The World Is Just a Programming Task (Easy Version) brute force, dp, greedy, implementation	1900	x1339
1248B	Grow The Tree greedy, math, sortings	900	x8360
1248A	Integer Points geometry, math	900	x7990
1246F	Cursor Distance	3400	x42
1245F	Daniel and Spring Cleaning bitmasks, brute force, combinatorics, dp	2300	x941
1245E	Hyakugoku and Ladders dp, probabilities, shortest paths	2300	x722
1245D	Shichikuji and Power Grid dsu, graphs, greedy, shortest paths, trees	1900	x2987
1245C	Constanze's Machine dp	1400	x6721
1245B	Restricted RPS constructive algorithms, dp, greedy	1200	x7390
1245A	Good ol' Numbers Coloring math, number theory	1000	x8895
1244G	Running in Pairs constructive algorithms, greedy, math	2500	x801
1244F	Chips constructive algorithms, implementation	2300	x854
1244E	Minimizing Difference binary search, constructive algorithms, greedy, sortings, ternary search, two pointers	2000	x2571
1244D	Paint the Tree brute force, constructive algorithms, dp, graphs, implementation, trees	1700	x3857
1244C	The Football Season brute force, math, number theory	1900	x4214
1244B	Rooms and Staircases brute force, implementation	1000	x8890
1244A	Pens and Pencils math	700	x11500
1243B2	Character Swap (Hard Version) strings	1600	x3998
1243B1	Character Swap (Easy Version) strings	1100	x8411
1243A	Maximum Square implementation	800	x9795
1242E	Planar Perimeter constructive algorithms, graphs	3200	x45
1242D	Number Discovery math	3400	x67
1242C	Sum Balance bitmasks, dfs and similar, dp, graphs	2400	x855
1242B	0-1 MST dfs and similar, dsu, graphs, sortings	1900	x3128
1242A	Tile Painting constructive algorithms, math, number theory	1500	x6803
1240F	Football graphs	3100	x44
1239F	Swiper, no swiping! graphs, implementation	3400	x48
1239E	Turtle dp, implementation	3100	x200
1239D	Catowice City 2-sat, dfs and similar, graph matchings, graphs	2400	x769
1239C	Queue in the Train data structures, greedy, implementation	2300	x771
1239B	The World Is Just a Programming Task (Hard Version) implementation	2500	x600
1239A	Ivan the Fool and the Probability Theory combinatorics, dp, math	1700	x4162
1238G	Adilbek and the Watering System data structures, greedy, sortings	2700	x201
1238F	The Maximum Subtree dfs and similar, dp, graphs, trees	2300	x840
1238E	Keyboard Purchase bitmasks, dp	2200	x1336
1238D	AB-string binary search, combinatorics, dp, strings	1800	x3166
1238C	Standard Free2play dp, greedy, math	1600	x4409
1238B	Kill `Em All greedy, sortings	1300	x7706
1238A	Prime Subtraction math, number theory	900	x11689
1237H	Balanced Reversals constructive algorithms	3200	x72
1237G	Balanced Distribution data structures, dp, greedy	3600	x34
1237F	Balanced Domino Placements combinatorics, dp	2600	x362
1237E	Balanced Binary Search Trees dp, math	2400	x736
1237D	Balanced Playlist binary search, data structures, implementation	1900	x2257
1237C2	Balanced Removals (Harder) binary search, constructive algorithms, divide and conquer, greedy, implementation, sortings	1900	x2528
1237C1	Balanced Removals (Easier) constructive algorithms, geometry, greedy	1600	x3873
1237B	Balanced Tunnel data structures, sortings, two pointers	1300	x6886
1237A	Balanced Rating Changes implementation, math	1100	x8543
1236F	Alice and the Cactus dfs and similar, graphs, math, probabilities	2900	x54
1236E	Alice and the Unfair Game binary search, data structures, dp, dsu	2600	x363
1236D	Alice and the Doll brute force, data structures, greedy, implementation	2100	x1163
1236C	Labs constructive algorithms, greedy, implementation	1300	x6128
1236B	Alice and the List of Presents combinatorics, math	1400	x6135
1236A	Stones brute force, greedy, math	800	x10006
1234F	Yet Another Substring Reverse bitmasks, dp	2400	x1196
1234E	Special Permutations math	2000	x1481
1234D	Distinct Characters Queries data structures	1600	x5647
1234C	Pipes dp, implementation	1400	x6302
1234B2	Social Network (hard version) data structures, implementation	1200	x8884
1234B1	Social Network (easy version) implementation	1000	x10848
1234A	Equalize Prices Again math	900	x14385
1231E	Middle-Out constructive algorithms, greedy, strings	2000	x329
1231C	Increasing Matrix greedy	1100	x1242
1230B	Ania and Minimizing greedy, implementation	1000	x10511
1230A	Dawid and Bags of Candies brute force, implementation	800	x12784
1228F	One Node is Gone constructive algorithms, implementation, trees	2700	x275
1228E	Another Filling the Grid combinatorics, dp, math	2300	x1232
1228D	Complete Tripartite brute force, constructive algorithms, graphs, hashing, implementation	1800	x3353