Problemset - Codeforces

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Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
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Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
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Problems

#	Name
1662I	Ice Cream Shop brute force, implementation, sortings		x2468
1662H	Boundary brute force, math		x3368
1662G	Gastronomic Event dp, greedy, trees		x561
1662F	Antennas data structures, dfs and similar, graphs, graphs, implementation, implementation, shortest paths, shortest paths		x1245
1662E	Round Table math		x179
1662D	Evolution of Weasels greedy, implementation, strings		x2155
1662C	European Trip dp, graphs, math, matrices		x383
1662B	Toys greedy, strings		x152
1662A	Organizing SWERC brute force, implementation		x4840
1661F	Teleporters binary search, greedy	2600	x824
1661E	Narrow Components brute force, data structures, dp, dsu, math, trees	2500	x1121
1661D	Progressions Covering data structures, greedy	1900	x5384
1661C	Water the Trees binary search, greedy, math	1700	x10531
1661B	Getting Zero bitmasks, brute force, dfs and similar, dp, graphs, greedy, shortest paths	1300	x20644
1661A	Array Balancing greedy, math	800	x19358
1660F2	Promising String (hard version) data structures, implementation, math, strings	2100	x3144
1660F1	Promising String (easy version) brute force, implementation, math, strings	1700	x7953
1660E	Matrix and Shifts brute force, constructive algorithms, greedy, implementation	1600	x8088
1660D	Maximum Product Strikes Back brute force, implementation, math, two pointers	1600	x11486
1660C	Get an Even String dp, greedy, strings	1300	x22005
1660B	Vlad and Candies math	800	x29744
1660A	Vasya and Coins greedy, math	800	x39193
1659F	Tree and Permutation Game dfs and similar, games, graphs, trees	3000	x249
1659E	AND-MEX Walk bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs	2200	x1970
1659D	Reverse Sort Sum constructive algorithms, data structures, greedy, implementation, math, two pointers	1900	x4446
1659C	Line Empire binary search, brute force, dp, greedy, implementation, math	1500	x15029
1659B	Bit Flipping bitmasks, constructive algorithms, greedy, strings	1300	x12027
1659A	Red Versus Blue constructive algorithms, greedy, implementation, math	1000	x30905
1658F	Juju and Binary String brute force, constructive algorithms, greedy, math	2700	x921
1658E	Gojou and Matrix Game data structures, dp, games, hashing, implementation, math, number theory, sortings	2500	x1175
1658D2	388535 (Hard Version) bitmasks, brute force, data structures, math	2300	x3175
1658D1	388535 (Easy Version) bitmasks, math	1600	x9994
1658C	Shinju and the Lost Permutation constructive algorithms, math	1700	x9943
1658B	Marin and Anti-coprime Permutation combinatorics, math, number theory	800	x19541
1658A	Marin and Photoshoot constructive algorithms, implementation, math	800	x20904
1657F	Words on Tree 2-sat, dfs and similar, dsu, graphs, trees	2600	x755
1657E	Star MST combinatorics, dp, graph matchings, math	2200	x2487
1657D	For Gamers. By Gamers. binary search, brute force, greedy, math, sortings	2000	x5289
1657C	Bracket Sequence Deletion greedy, implementation	1200	x17680
1657B	XY Sequence greedy	800	x23607
1657A	Integer Moves brute force, math	800	x24890
1656I	Neighbour Ordering constructive algorithms, graphs	3500	x154
1656H	Equal LCM Subsets data structures, math, number theory	3200	x796
1656G	Cycle Palindrome constructive algorithms, graphs, math	3200	x462
1656F	Parametric MST binary search, constructive algorithms, graphs, greedy, math, sortings	2600	x1219
1656E	Equal Tree Sums constructive algorithms, dfs and similar, math, trees	2200	x3857
1656D	K-good constructive algorithms, math, number theory	1900	x7558
1656C	Make Equal With Mod constructive algorithms, math, number theory, sortings	1200	x21000
1656B	Subtract Operation data structures, greedy, math, two pointers	1100	x26779
1656A	Good Pairs math, sortings	800	x20452
1654H	Three Minimums combinatorics, constructive algorithms, divide and conquer, dp, fft, math	3500	x100
1654G	Snowy Mountain data structures, dfs and similar, graphs, greedy, shortest paths, trees	2900	x457
1654F	Minimal String Xoration bitmasks, data structures, divide and conquer, greedy, hashing, sortings, strings	2800	x1482
1654E	Arithmetic Operations brute force, data structures, graphs, math	2300	x2359
1654D	Potion Brewing Class dfs and similar, math, number theory, trees	2100	x3062
1654C	Alice and the Cake data structures, greedy, implementation, sortings	1400	x14514
1654B	Prefix Removals strings	800	x16778
1654A	Maximum Cake Tastiness brute force, greedy, implementation, sortings	800	x19390
1651F	Tower Defense binary search, brute force, data structures	3000	x481
1651E	Sum of Matchings brute force, combinatorics, constructive algorithms, dfs and similar, graph matchings, greedy, math	2600	x619
1651D	Nearest Excluded Points binary search, data structures, dfs and similar, graphs, shortest paths	1900	x6480
1651C	Fault-tolerant Network brute force, data structures, implementation	1500	x11580
1651B	Prove Him Wrong constructive algorithms, greedy	800	x20480
1651A	Playoff implementation	800	x26648
1650G	Counting Shortcuts data structures, dfs and similar, dp, graphs, shortest paths	2100	x2930
1650F	Vitaly and Advanced Useless Algorithms dp, greedy, implementation	2200	x1665
1650E	Rescheduling the Exam binary search, data structures, greedy, implementation, math, sortings	1900	x4463
1650D	Twist the Permutation brute force, constructive algorithms, implementation, math	1300	x14568
1650C	Weight of the System of Nested Segments greedy, hashing, implementation, sortings	1200	x18507
1650B	DIV + MOD math	900	x29983
1650A	Deletions of Two Adjacent Letters implementation, strings	800	x37297
1649B	Game of Ball Passing greedy, implementation	1300	x13953
1649A	Game implementation	800	x16042
1648F	Two Avenues data structures, dfs and similar, graphs	3500	x185
1648E	Air Reform data structures, dfs and similar, divide and conquer, dsu, graphs, implementation, trees	3200	x509
1648D	Serious Business data structures, divide and conquer, dp, implementation, shortest paths	2800	x1051
1648C	Tyler and Strings combinatorics, data structures, implementation	1900	x3339
1648B	Integral Array brute force, constructive algorithms, data structures, math	1800	x7259
1648A	Weird Sum combinatorics, data structures, geometry, math, matrices, sortings	1400	x18736
1647F	Madoka and Laziness dp, greedy	3100	x543
1647E	Madoka and the Sixth-graders data structures, dfs and similar, greedy	2500	x1097
1647D	Madoka and the Best School in Russia constructive algorithms, dp, math, number theory	1900	x5698
1647C	Madoka and Childish Pranks constructive algorithms, greedy	1300	x13331
1647B	Madoka and the Elegant Gift brute force, constructive algorithms, graphs, implementation	1200	x17120
1647A	Madoka and Math Dad implementation, math	800	x23488
1646F	Playing Around the Table constructive algorithms, greedy, implementation	2900	x670
1646E	Power Board brute force, dp, math, number theory	2200	x2757
1646D	Weight the Tree constructive algorithms, dfs and similar, dp, implementation, trees	2000	x4441
1646C	Factorials and Powers of Two bitmasks, brute force, constructive algorithms, dp, math	1500	x19492
1646B	Quality vs Quantity brute force, constructive algorithms, greedy, sortings, two pointers	800	x22665
1646A	Square Counting math	800	x25383
1644F	Basis combinatorics, fft, math, number theory	2900	x428
1644E	Expand the Path brute force, combinatorics, data structures, implementation, math	1900	x3490
1644D	Cross Coloring data structures, implementation, math	1700	x7875
1644C	Increase Subarray Sums brute force, dp, greedy, implementation	1400	x14996
1644B	Anti-Fibonacci Permutation brute force, constructive algorithms, implementation	800	x21315
1644A	Doors and Keys implementation	800	x28629
1642B	Power Walking greedy	900	x18242
1642A	Hard Way geometry	800	x16730
1641F	Covering Circle geometry	3500	x120

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