Problemset - Codeforces

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

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Difficulty: —

interactive

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Problems

#	Name
1292E	Rin and The Unknown Flower constructive algorithms, greedy, interactive, math	3500	x56
750H	New Year and Snowy Grid dfs and similar, dsu, graphs, interactive	3400	x56
1147F	Zigzag Game games, interactive	3400	x59
1158E	Strange device binary search, interactive, math, trees	3300	x43
1179E	Alesya and Discrete Math divide and conquer, interactive	3200	x59
772E	Verifying Kingdom binary search, divide and conquer, interactive, trees	3200	x62
1091G	New Year and the Factorisation Collaboration interactive, math, number theory	3100	x99
1142E	Pink Floyd graphs, interactive	3100	x115
1201E2	Knightmare (hard) graphs, interactive, shortest paths	3000	x60
1129E	Legendary Tree binary search, interactive, trees	3000	x163
1201E1	Knightmare (easy) graphs, interactive, shortest paths	2900	x60
788D	Finding lines constructive algorithms, divide and conquer, interactive	2900	x144
1147E	Rainbow Coins interactive	2900	x174
1028G	Guess the number dp, interactive	2900	x244
1286C2	Madhouse (Hard version) brute force, constructive algorithms, hashing, interactive, math	2900	x258
1007C	Guess two numbers binary search, interactive	2800	x172
1089C	Cactus Search interactive	2800	x243
1033E	Hidden Bipartite Graph binary search, constructive algorithms, dfs and similar, graphs, interactive	2700	x256
750F	New Year and Finding Roots constructive algorithms, implementation, interactive, trees	2700	x287
1080F	Katya and Segments Sets data structures, interactive, sortings	2700	x318
1267I	Intriguing Selection brute force, constructive algorithms, implementation, interactive, sortings	2700	x366
916D	Jamie and To-do List data structures, interactive, trees	2600	x262
1081F	Tricky Interactor constructive algorithms, implementation, interactive	2500	x262
1137D	Cooperative Game constructive algorithms, interactive, number theory	2500	x608
1205C	Palindromic Paths implementation, interactive	2500	x753
753C	Interactive Bulls and Cows (Hard) brute force, constructive algorithms, interactive	2400	x180
1061F	Lost Root interactive, probabilities	2400	x341
1100D	Dasha and Chess constructive algorithms, games, interactive	2400	x564
835E	The penguin's game binary search, constructive algorithms, interactive	2400	x598
1286C1	Madhouse (Easy version) brute force, constructive algorithms, interactive, math	2400	x643
1174F	Ehab and the Big Finale constructive algorithms, divide and conquer, graphs, implementation, interactive, trees	2300	x696
1254C	Point Ordering constructive algorithms, geometry, interactive, math	2300	x716
1282D	Enchanted Artifact constructive algorithms, interactive, strings	2300	x1176
1155E	Guess the Root brute force, interactive, math	2200	x844
1117E	Decypher the String bitmasks, chinese remainder theorem, constructive algorithms, interactive, math	2200	x874
809B	Glad to see you! binary search, interactive	2200	x1027
713B	Searching Rectangles binary search, constructive algorithms, interactive	2200	x1102
1019B	The hat binary search, interactive	2200	x1209
870D	Something with XOR Queries brute force, interactive, probabilities	2100	x855
1153E	Serval and Snake binary search, brute force, interactive	2100	x1031
1023E	Down or Right constructive algorithms, interactive, matrices	2100	x1318
1039B	Subway Pursuit binary search, interactive, probabilities	2100	x1450
1114E	Arithmetic Progression binary search, interactive, number theory, probabilities	2100	x1729
811D	Vladik and Favorite Game constructive algorithms, dfs and similar, graphs, interactive	2000	x1032
862D	Mahmoud and Ehab and the binary string binary search, divide and conquer, interactive	2000	x1082
744B	Hongcow's Game bitmasks, divide and conquer, interactive	2000	x1311
896B	Ithea Plays With Chtholly binary search, constructive algorithms, games, greedy, interactive	2000	x1330
1033D	Divisors interactive, math, number theory	2000	x1441
843B	Interactive LowerBound brute force, interactive, probabilities	2000	x1444
1088D	Ehab and another another xor problem bitmasks, constructive algorithms, implementation, interactive	2000	x1646
1103B	Game with modulo binary search, constructive algorithms, interactive	2000	x2146
1044B	Intersecting Subtrees dfs and similar, interactive, trees	1900	x1067
730B	Minimum and Maximum constructive algorithms, interactive	1900	x1646
1063C	Dwarves, Hats and Extrasensory Abilities binary search, constructive algorithms, geometry, interactive	1900	x1846
1270D	Strange Device constructive algorithms, interactive, math, sortings	1900	x2904
952B	A Map of the Cat brute force, interactive	1800	x1389
1207E	XOR Guessing bitmasks, interactive, math	1800	x3122
1010B	Rocket binary search, interactive	1800	x3228
1056C	Pick Heroes greedy, implementation, interactive, sortings	1700	x1625
1146C	Tree Diameter bitmasks, graphs, interactive	1700	x2149
727C	Guess the Array constructive algorithms, interactive, math	1400	x2683
1167B	Lost Numbers brute force, divide and conquer, interactive, math	1400	x5316
679A	Bear and Prime 100 constructive algorithms, interactive, math	1400	x6277
755C	PolandBall and Forest dfs and similar, dsu, graphs, interactive, trees	1300	x5503
1275F	Шардирование постов *special problem, binary search, interactive		x90