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
1954B	Make It Ugly implementation, math	1200	x21506
1952J	Help, what does it mean to be "Based" *special problem, brute force, constructive algorithms, expression parsing, implementation, sortings		x901
1952H	Palindrome *special problem, implementation, strings		x805
1952D	Are You a Procrastinator? *special problem, implementation		x5359
1951E	No Palindromes brute force, constructive algorithms, divide and conquer, greedy, hashing, implementation, math, strings	2000	x4477
1950G	Shuffling Songs bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings	1900	x6071
1950F	0, 1, 2, Tree! bitmasks, brute force, greedy, implementation, trees	1700	x11273
1950E	Nearly Shortest Repeating Substring brute force, implementation, number theory, strings	1500	x17416
1950D	Product of Binary Decimals brute force, dp, implementation, number theory	1100	x26486
1950C	Clock Conversion implementation, math	800	x46881
1950B	Upscaling implementation	800	x44189
1950A	Stair, Peak, or Neither? implementation	800	x69388
1949J	Amanda the Amoeba graphs, implementation, trees, two pointers	2600	x536
1948E	Clique Partition brute force, constructive algorithms, graphs, greedy, implementation	2100	x3514
1948B	Array Fix brute force, dp, greedy, implementation	1100	x26265
1946D	Birthday Gift bitmasks, brute force, constructive algorithms, greedy, implementation	1900	x5605
1946C	Tree Cutting binary search, dp, greedy, implementation, trees	1600	x13712
1946A	Median of an Array greedy, implementation, sortings	800	x28565
1945G	Cook and Porridge binary search, constructive algorithms, data structures, implementation	2500	x907
1943B	Non-Palindromic Substring hashing, implementation, math, strings	2000	x4540
1942F	Farmer John's Favorite Function brute force, data structures, implementation, math	2700	x973
1942D	Learning to Paint binary search, data structures, dfs and similar, dp, greedy, implementation, sortings	2100	x3347
1941D	Rudolf and the Ball Game dfs and similar, dp, implementation	1200	x20933
1940B	Three Arrays *special problem, constructive algorithms, implementation, sortings		x270
1937B	Binary Path dp, greedy, implementation	1300	x17330
1937A	Shuffle Party implementation, math	800	x24652
1936C	Pokémon Arena data structures, graphs, greedy, implementation, shortest paths, sortings	2400	x1727
1936B	Pinball binary search, data structures, implementation, math, two pointers	2000	x3561
1935F	Andrey's Tree binary search, constructive algorithms, data structures, dfs and similar, dsu, greedy, implementation, trees	2800	x609
1935D	Exam in MAC binary search, combinatorics, implementation, math	1800	x10663
1933E	Turtle vs. Rabbit Race: Optimal Trainings binary search, implementation, math, ternary search	1500	x13620
1933C	Turtle Fingers: Count the Values of k brute force, implementation, math, number theory	1100	x25369
1933B	Turtle Math: Fast Three Task implementation, math, number theory	800	x36267
1932E	Final Countdown implementation, math, number theory	1600	x10190
1932D	Card Game greedy, implementation	1400	x13430
1932C	LR-remainders brute force, data structures, implementation, math, two pointers	1400	x18915
1932A	Thorns and Coins dp, greedy, implementation	800	x33887
1930D2	Sum over all Substrings (Hard Version) bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings	2100	x3049
1928F	Digital Patterns combinatorics, data structures, implementation, math	2900	x347
1927F	Microcycle data structures, dfs and similar, dsu, graphs, greedy, implementation, sortings, trees	1900	x5383
1926G	Vlad and Trouble at MIT dfs and similar, dp, flows, graphs, greedy, implementation, trees	1900	x4533
1926F	Vlad and Avoiding X bitmasks, brute force, dfs and similar, dp, implementation	2200	x2092
1926E	Vlad and an Odd Ordering binary search, bitmasks, data structures, dp, implementation, math, number theory	1500	x14837
1926C	Vlad and a Sum of Sum of Digits dp, implementation	1200	x32728
1926B	Vlad and Shapes geometry, implementation	800	x36442
1926A	Vlad and the Best of Five implementation	800	x62144
1924B	Space Harbour data structures, implementation, math, sortings	2100	x3284
1923F	Shrink-Reverse binary search, brute force, greedy, hashing, implementation, string suffix structures, strings	2800	x535
1923B	Monsters Attack! dp, greedy, implementation	1100	x19871
1923A	Moving Chips greedy, implementation	800	x26363
1922D	Berserk Monsters brute force, data structures, dsu, implementation, math	1900	x6769
1922C	Closest Cities greedy, implementation, math	1300	x21998
1922A	Tricky Template constructive algorithms, implementation, strings	800	x28844
1921G	Mischievous Shooter brute force, data structures, divide and conquer, dp, implementation	2200	x1472
1921F	Sum of Progression brute force, data structures, dp, implementation, math	1900	x5005
1921B	Arranging Cats greedy, implementation	800	x36573
1920D	Array Repetition binary search, brute force, dsu, implementation, math	1900	x6493
1919E	Counting Prefixes combinatorics, constructive algorithms, dp, implementation, math	2600	x1130
1918F	Caterpillar on a Tree dfs and similar, graphs, greedy, implementation, sortings, trees	2500	x1105
1918E	ace5 and Task Order constructive algorithms, divide and conquer, implementation, interactive, probabilities, sortings	2200	x2062
1918D	Blocking Elements binary search, data structures, dp, implementation, two pointers	1900	x6190
1918C	XOR-distance bitmasks, greedy, implementation, math	1400	x16649
1918B	Minimize Inversions constructive algorithms, data structures, greedy, implementation, sortings	900	x27019
1918A	Brick Wall constructive algorithms, greedy, implementation, math	800	x32369
1917D	Yet Another Inversions Problem combinatorics, data structures, dp, implementation, math, number theory	2300	x2070
1917C	Watering an Array brute force, greedy, implementation, math	1600	x12384
1916C	Training Before the Olympiad constructive algorithms, games, greedy, implementation, math	1200	x19874
1916A	2023 constructive algorithms, implementation, math, number theory	800	x28311
1915G	Bicycles graphs, greedy, implementation, shortest paths, sortings	1800	x9698
1915D	Unnatural Language Processing greedy, implementation, strings	900	x35064
1915C	Can I Square? binary search, implementation	800	x54129
1915B	Not Quite Latin Square bitmasks, brute force, implementation	800	x50322
1915A	Odd One Out bitmasks, implementation	800	x79723
1914D	Three Activities brute force, dp, greedy, implementation, sortings	1200	x38034
1914A	Problemsolving Log implementation, strings	800	x35140
1913A	Rating Increase implementation	800	x27257
1912E	Evaluate It and Back Again constructive algorithms, implementation, math	2200	x1273
1912A	Accumulator Apex data structures, implementation, sortings	1900	x2987
1910C	Poisonous Swamp special problem, special problem, implementation, implementation	1600	x734
1910A	Username *special problem, implementation	1100	x1985
1909A	Distinct Buttons implementation, math	800	x18924
1907G	Lights brute force, constructive algorithms, dfs and similar, graphs, greedy, implementation	2200	x2335
1907B	YetnotherrokenKeoard data structures, implementation, strings	1000	x30373
1907A	Rook implementation	800	x41746
1905D	Cyclic MEX data structures, implementation, math, two pointers	2000	x4620
1904F	Beautiful Tree data structures, dfs and similar, graphs, implementation, trees	2800	x500
1904E	Tree Queries data structures, dfs and similar, graphs, implementation, trees	2500	x1279
1904D2	Set To Max (Hard Version) constructive algorithms, data structures, divide and conquer, greedy, implementation, sortings	1800	x5702
1904A	Forked! brute force, implementation	900	x40315
1902F	Trees and XOR Queries Again data structures, dfs and similar, divide and conquer, graphs, implementation, math, trees	2400	x1480
1902D	Robot Queries binary search, data structures, dp, implementation	1900	x5323
1901D	Yet Another Monster Fight binary search, dp, greedy, implementation, math	1700	x8589
1900F	Local Deletions binary search, data structures, implementation	2800	x359
1900E	Transitive Graph dfs and similar, dp, dsu, graphs, implementation	2100	x2634
1900A	Cover in Water constructive algorithms, greedy, implementation, strings	800	x63961
1899E	Queue Sort greedy, implementation, sortings	1300	x18260
1899B	250 Thousand Tons of TNT brute force, implementation, number theory	1100	x33323
1898A	Milica and String brute force, implementation, strings	800	x17420
1896G	Pepe Racing constructive algorithms, implementation, interactive, sortings	3200	x410
1896F	Bracket Xoring constructive algorithms, greedy, implementation, math	2600	x961

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