Problemset - Codeforces

→ Pay attention

Before contest
Codeforces Round #720 (Div. 2)
03:11:42
Register now »

*has extra registration

→ Filter Problems

Difficulty: —

Add tag

Problems

#	Name
1520G	To Go Or Not To Go? brute force, dfs and similar, graphs, greedy, shortest paths	2200	x1312
1520F2	Guess the K-th Zero (Hard version) binary search, data structures, interactive	2200	x1274
1520F1	Guess the K-th Zero (Easy version) binary search, interactive	1600	x4375
1520E	Arranging The Sheep greedy, math	1400	x7440
1520D	Same Differences data structures, hashing, math	1200	x12074
1520C	Not Adjacent Matrix constructive algorithms	1000	x13866
1520B	Ordinary Numbers brute force, math, number theory	800	x17291
1520A	Do Not Be Distracted! brute force, implementation	800	x20766
1519F	Chests and Keys bitmasks, brute force, dfs and similar, dp, flows	3200	x89
1519E	Off by One constructive algorithms, dfs and similar, geometry, graphs, sortings, trees	2700	x420
1519D	Maximum Sum of Products brute force, dp, implementation, math, two pointers	1600	x6521
1519C	Berland Regional brute force, data structures, greedy, number theory, sortings	1400	x8314
1519B	The Cake Is a Lie dp, math	800	x16621
1519A	Red and Blue Beans math	800	x17601
1517H	Fly Around the World dp, geometry	3500	x16
1517G	Starry Night Camping constructive algorithms, flows, graphs	3300	x139
1517F	Reunion combinatorics, dp, trees	3200	x134
1517E	Group Photo binary search, data structures, implementation, two pointers	2500	x620
1517D	Explorer Space dp, graphs, shortest paths	1800	x4226
1517C	Fillomino 2 constructive algorithms, dfs and similar, greedy, implementation	1400	x7737
1517B	Morning Jogging constructive algorithms, greedy, sortings	1200	x8899
1517A	Sum of 2050 greedy, math	800	x16562
1516E	Baby Ehab Plays with Permutations combinatorics, dp, math	2500	x419
1516D	Cut binary search, data structures, dp, graphs, number theory, two pointers	2100	x2053
1516C	Baby Ehab Partitions Again bitmasks, constructive algorithms, dp, math	1700	x6178
1516B	AGAGA XOOORRR bitmasks, brute force, dp, greedy	1500	x9216
1516A	Tit for Tat greedy	800	x16080
1515I	Phoenix and Diamonds binary search, data structures, sortings	3400	x51
1515H	Phoenix and Bits bitmasks, brute force, data structures, sortings	3500	x60
1515G	Phoenix and Odometers dfs and similar, graphs, math, number theory	2700	x433
1515F	Phoenix and Earthquake constructive algorithms, dfs and similar, dsu, graphs, greedy, trees	2600	x754
1515E	Phoenix and Computers combinatorics, dp, math	2200	x1643
1515D	Phoenix and Socks greedy, sortings, two pointers	1500	x6335
1515C	Phoenix and Towers constructive algorithms, data structures, greedy	1400	x8554
1515B	Phoenix and Puzzle brute force, geometry, math, number theory	1000	x12648
1515A	Phoenix and Gold constructive algorithms, greedy, math	800	x14311
1514E	Baby Ehab's Hyper Apartment binary search, graphs, interactive, sortings, two pointers	2700	x259
1514D	Cut and Stick binary search, data structures, greedy, implementation, sortings	2000	x2521
1514C	Product 1 Modulo N greedy, number theory	1600	x7054
1514B	AND 0, Sum Big bitmasks, combinatorics, math	1200	x11141
1514A	Perfectly Imperfect Array math, number theory	800	x16252
1513F	Swapping Problem brute force, constructive algorithms, data structures, sortings	2500	x489
1513E	Cost Equilibrium combinatorics, constructive algorithms, math, sortings	2300	x884
1513D	GCD and MST constructive algorithms, dsu, graphs, greedy, number theory, sortings	2000	x2589
1513C	Add One dp, matrices	1600	x6570
1513B	AND Sequences bitmasks, combinatorics, constructive algorithms, math	1400	x7629
1513A	Array and Peaks constructive algorithms, implementation	800	x14638
1512G	Short Task brute force, dp, math, number theory	1700	x3655
1512F	Education brute force, dp, greedy, implementation	1900	x3166
1512E	Permutation by Sum brute force, greedy, math	1600	x5296
1512D	Corrupted Array constructive algorithms, data structures, greedy	1200	x10674
1512C	A-B Palindrome constructive algorithms, implementation, strings	1200	x10813
1512B	Almost Rectangle implementation	800	x17433
1512A	Spy Detected! brute force, implementation	800	x23540
1511G	Chips on a Board bitmasks, brute force, data structures, dp, games, two pointers	2700	x302
1511F	Chainword brute force, data structures, dp, matrices, string suffix structures, strings	2700	x168
1511E	Colorings and Dominoes combinatorics, dp, greedy, math	2100	x1587
1511D	Min Cost String brute force, constructive algorithms, graphs, greedy, strings	1600	x6424
1511C	Yet Another Card Deck brute force, data structures, implementation, trees	1100	x13304
1511B	GCD Length constructive algorithms, math, number theory	1100	x13348
1511A	Review Site greedy	800	x18302
1510K	King's Task brute force, graphs, implementation	1200	x2838
1510J	Japanese Game constructive algorithms, math	2700	x192
1510I	Is It Rated? greedy, interactive, math, probabilities	2700	x222
1510H	Hard Optimization dp	3200	x40
1510G	Guide	2100	x865
1510F	Fiber Shape	2800	x22
1510E	Equilibrium Point /\textbackslash/\textbackslash	2700	x120
1510D	Digits dp, math, number theory	2100	x1028
1510C	Cactus Not Enough dfs and similar, graph matchings, graphs	2900	x97
1510B	Button Lock flows, graph matchings, graphs	2600	x377
1510A	ASCII Automata Art	3100	x81
1509C	The Sports Festival dp, greedy	1800	x6136
1509B	TMT Document greedy	1100	x13275
1509A	Average Height constructive algorithms	800	x17868
1508F	Optimal Encoding brute force, data structures	3500	x37
1508E	Tree Calendar brute force, constructive algorithms, data structures, dfs and similar, sortings, trees	3100	x144
1508D	Swap Pass constructive algorithms, geometry, sortings	3000	x187
1508C	Complete the MST bitmasks, brute force, data structures, dfs and similar, dsu, graphs, greedy, trees	2500	x720
1508B	Almost Sorted binary search, combinatorics, constructive algorithms, implementation	1800	x2020
1508A	Binary Literature constructive algorithms, greedy, implementation, strings, two pointers	1900	x3742
1506G	Maximize the Remaining String brute force, data structures, dp, greedy, strings	2000	x2570
1506F	Triangular Paths constructive algorithms, graphs, math, shortest paths, sortings	2000	x2032
1506E	Restoring the Permutation constructive algorithms, implementation	1500	x7336
1506D	Epic Transformation constructive algorithms, data structures, greedy	1400	x10647
1506C	Double-ended Strings brute force, implementation, strings	1000	x14363
1506B	Partial Replacement greedy, implementation	1100	x13709
1506A	Strange Table math	800	x20637
1505I	Mysterious language again, seriously? *special problem	2200	x232
1505H	L BREAK into program *special problem	2500	x253
1505G	Encoded message *special problem, implementation	2600	x170
1505F	Math *special problem, math	2200	x875
1505E	Cakewalk *special problem, greedy, implementation, shortest paths	1800	x1286
1505D	Xenolith? Hippodrome? *special problem, number theory	1800	x335
1505C	Fibonacci Words *special problem, implementation	1400	x4036
1505B	DMCA *special problem, implementation, number theory	1600	x3688
1505A	Is it rated - 2 *special problem, implementation, interactive	900	x8784
1504B	Flip the Bits constructive algorithms, greedy, implementation, math	1200	x10789
1504A	Déjà Vu constructive algorithms, strings	800	x15065
1503F	Balance the Cards constructive algorithms, data structures, divide and conquer, geometry, graphs, implementation	3500	x41

←