Problemset - Codeforces

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Codeforces Round (Div. 2)
7 days

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Problems

#	Name
1658A	Marin and Photoshoot constructive algorithms, implementation, math	800	x20317
1657F	Words on Tree 2-sat, dfs and similar, dsu, graphs, trees	2600	x577
1657E	Star MST combinatorics, dp, graph matchings, math	2200	x2093
1657D	For Gamers. By Gamers. binary search, brute force, greedy, math, sortings	2000	x4861
1657C	Bracket Sequence Deletion greedy, implementation	1200	x16816
1657B	XY Sequence greedy	800	x22802
1657A	Integer Moves brute force, math	800	x23970
1656I	Neighbour Ordering constructive algorithms, graphs	3500	x104
1656H	Equal LCM Subsets data structures, math, number theory	3200	x575
1656G	Cycle Palindrome constructive algorithms, graphs, math	3200	x385
1656F	Parametric MST binary search, constructive algorithms, graphs, greedy, math, sortings	2600	x1037
1656E	Equal Tree Sums constructive algorithms, dfs and similar, math, trees	2200	x3445
1656D	K-good constructive algorithms, math, number theory	1900	x6867
1656C	Make Equal With Mod constructive algorithms, math, number theory, sortings	1200	x19162
1656B	Subtract Operation data structures, greedy, math, two pointers	1100	x18897
1656A	Good Pairs math, sortings	800	x19585
1654H	Three Minimums combinatorics, constructive algorithms, divide and conquer, dp, fft, math	3500	x76
1654G	Snowy Mountain data structures, dfs and similar, graphs, greedy, shortest paths, trees	2900	x394
1654F	Minimal String Xoration bitmasks, data structures, divide and conquer, greedy, hashing, sortings, strings	2800	x1199
1654E	Arithmetic Operations brute force, data structures, graphs, math	2300	x2090
1654D	Potion Brewing Class dfs and similar, math, number theory, trees	2100	x2845
1654C	Alice and the Cake data structures, greedy, implementation, sortings	1400	x13487
1654B	Prefix Removals strings	800	x15623
1654A	Maximum Cake Tastiness brute force, greedy, implementation, sortings	800	x18654
1651F	Tower Defense binary search, brute force, data structures	3000	x380
1651E	Sum of Matchings brute force, combinatorics, constructive algorithms, dfs and similar, graph matchings, greedy, math	2600	x519
1651D	Nearest Excluded Points binary search, data structures, dfs and similar, graphs, shortest paths	1900	x5126
1651C	Fault-tolerant Network brute force, data structures, implementation	1500	x10707
1651B	Prove Him Wrong constructive algorithms, greedy	800	x19571
1651A	Playoff implementation	800	x25668
1650G	Counting Shortcuts data structures, dfs and similar, dp, graphs, shortest paths	2100	x2483
1650F	Vitaly and Advanced Useless Algorithms dp, greedy, implementation	2200	x1455
1650E	Rescheduling the Exam binary search, data structures, greedy, implementation, math, sortings	1900	x4143
1650D	Twist the Permutation brute force, constructive algorithms, implementation, math	1300	x13029
1650C	Weight of the System of Nested Segments greedy, hashing, implementation, sortings	1200	x16740
1650B	DIV + MOD math	900	x27660
1650A	Deletions of Two Adjacent Letters implementation, strings	800	x34705
1649B	Game of Ball Passing greedy, implementation	1300	x13030
1649A	Game implementation	800	x15531
1648F	Two Avenues data structures, dfs and similar, graphs	3500	x134
1648E	Air Reform data structures, dfs and similar, divide and conquer, dsu, graphs, implementation, trees	3200	x402
1648D	Serious Business data structures, divide and conquer, dp, implementation, shortest paths	2800	x882
1648C	Tyler and Strings combinatorics, data structures, implementation	1900	x2984
1648B	Integral Array brute force, constructive algorithms, data structures, math	1800	x6438
1648A	Weird Sum combinatorics, data structures, geometry, math, matrices, sortings	1400	x12837
1647F	Madoka and Laziness dp, greedy	3100	x455
1647E	Madoka and the Sixth-graders data structures, dfs and similar, greedy	2500	x992
1647D	Madoka and the Best School in Russia constructive algorithms, dp, math, number theory	1900	x5281
1647C	Madoka and Childish Pranks constructive algorithms, greedy	1300	x12594
1647B	Madoka and the Elegant Gift brute force, constructive algorithms, graphs, implementation	1200	x15391
1647A	Madoka and Math Dad implementation, math	800	x22759
1646F	Playing Around the Table constructive algorithms, greedy, implementation	2900	x525
1646E	Power Board brute force, dp, math, number theory	2200	x2436
1646D	Weight the Tree constructive algorithms, dfs and similar, dp, implementation, trees	2000	x3744
1646C	Factorials and Powers of Two bitmasks, brute force, constructive algorithms, dp, math	1500	x14127
1646B	Quality vs Quantity brute force, constructive algorithms, greedy, sortings, two pointers	800	x21154
1646A	Square Counting math	800	x24284
1644F	Basis combinatorics, fft, math, number theory	2900	x326
1644E	Expand the Path brute force, combinatorics, data structures, implementation, math	1900	x3099
1644D	Cross Coloring data structures, implementation, math	1700	x7237
1644C	Increase Subarray Sums brute force, dp, greedy, implementation	1400	x13772
1644B	Anti-Fibonacci Permutation brute force, constructive algorithms, implementation	800	x20673
1644A	Doors and Keys implementation	800	x27345
1642B	Power Walking greedy	900	x16933
1642A	Hard Way geometry	800	x16202
1641F	Covering Circle geometry	3500	x99
1641E	Special Positions combinatorics, divide and conquer, fft, math	3300	x208
1641D	Two Arrays bitmasks, brute force, combinatorics, greedy, hashing, math, two pointers	2700	x1161
1641C	Anonymity Is Important binary search, brute force, data structures, dsu, greedy, sortings	2200	x2428
1641B	Repetitions Decoding constructive algorithms, implementation, sortings	2000	x3813
1641A	Great Sequence brute force, greedy, sortings	1200	x17899
1639K	Treasure Hunt graphs, interactive
1639J	Treasure Hunt graphs, interactive
1639I	Treasure Hunt graphs, interactive
1639H	Treasure Hunt graphs, interactive
1639G	Treasure Hunt graphs, interactive
1639F	Treasure Hunt graphs, interactive
1639E	Treasure Hunt graphs, interactive
1639D	Treasure Hunt graphs, interactive
1639C	Treasure Hunt graphs, interactive
1639B	Treasure Hunt graphs, interactive
1639A	Treasure Hunt graphs, interactive
1638F	Two Posters brute force, data structures, greedy, two pointers	3200	x226
1638E	Colorful Operations brute force, data structures, implementation	2400	x1910
1638D	Big Brush constructive algorithms, data structures, greedy, implementation	2000	x4200
1638C	Inversion Graph data structures, dsu, graphs, math	1300	x14682
1638B	Odd Swap Sort data structures, math, sortings	1100	x20850
1638A	Reverse constructive algorithms, greedy, math	800	x21459
1637H	Minimize Inversions Number data structures, greedy, math, sortings	3500	x315
1637G	Birthday constructive algorithms, greedy, math	3000	x503
1637F	Towers constructive algorithms, dfs and similar, dp, greedy, trees	2500	x1774
1637E	Best Pair binary search, brute force, implementation	2100	x3343
1637D	Yet Another Minimization Problem dp, greedy, math	1800	x7719
1637C	Andrew and Stones greedy, implementation	1200	x17735
1637B	MEX and Array brute force, dp, greedy, math	1100	x14804
1637A	Sorting Parts brute force, sortings	800	x22298
1635F	Closest Pair data structures, greedy	2800	x1106
1635E	Cars 2-sat, constructive algorithms, dfs and similar, dsu, graphs, greedy, sortings	2200	x2222
1635D	Infinite Set bitmasks, dp, math, matrices, number theory, strings	1800	x6254
1635C	Differential Sorting constructive algorithms, greedy	1200	x17572