Problemset - Codeforces

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Codeforces Round (Div. 2)
3 days
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Problems

#	Name
1366D	Two Divisors constructive algorithms, math, number theory	2000	x10500
1366C	Palindromic Paths greedy, math	1500	x13572
1366B	Shuffle math, two pointers	1300	x21007
1366A	Shovels and Swords binary search, greedy, math	1100	x30074
1365G	Secure Password bitmasks, combinatorics, constructive algorithms, interactive, math	2800	x1164
1365F	Swaps Again constructive algorithms, implementation, sortings	2100	x4442
1365E	Maximum Subsequence Value brute force, constructive algorithms	1900	x7834
1365D	Solve The Maze constructive algorithms, dfs and similar, dsu, graphs, greedy, implementation, shortest paths	1700	x17292
1365C	Rotation Matching constructive algorithms, data structures, greedy, implementation	1400	x23098
1365B	Trouble Sort constructive algorithms, implementation	1300	x26848
1365A	Matrix Game games, greedy, implementation	1100	x24092
1364E	X-OR bitmasks, constructive algorithms, divide and conquer, interactive, probabilities	2700	x1423
1364D	Ehab's Last Corollary constructive algorithms, dfs and similar, graphs, greedy, implementation, trees	2100	x4376
1364C	Ehab and Prefix MEXs brute force, constructive algorithms, greedy	1600	x13164
1364B	Most socially-distanced subsequence greedy, two pointers	1300	x19858
1364A	XXXXX brute force, data structures, number theory, two pointers	1200	x28046
1363F	Rotating Substrings dp, strings	2600	x1496
1363E	Tree Shuffling dfs and similar, dp, greedy, trees	2000	x6816
1363D	Guess The Maximums binary search, implementation, interactive, math	2100	x4079
1363C	Game On Leaves games, trees	1600	x18693
1363B	Subsequence Hate implementation, strings	1400	x23611
1363A	Odd Selection brute force, implementation, math	1200	x35895
1362C	Johnny and Another Rating Drop bitmasks, greedy, math	1400	x18318
1362B	Johnny and His Hobbies bitmasks, brute force	1200	x19171
1362A	Johnny and Ancient Computer implementation	1000	x24059
1361F	Johnny and New Toy data structures, implementation, math	3300	x154
1361E	James and the Chase dfs and similar, graphs, probabilities, trees	3000	x689
1361D	Johnny and James greedy, implementation, math, trees	2900	x317
1361C	Johnny and Megan's Necklace binary search, bitmasks, constructive algorithms, dfs and similar, dsu, graphs	2500	x1632
1361B	Johnny and Grandmaster greedy, implementation, math, sortings	1900	x3623
1361A	Johnny and Contribution constructive algorithms, graphs, greedy, sortings	1700	x8425
1360H	Binary Median binary search, bitmasks, brute force, constructive algorithms	2100	x4573
1360G	A/B Matrix constructive algorithms, greedy, math	1900	x7748
1360F	Spy-string bitmasks, brute force, constructive algorithms, dp, hashing, strings	1700	x12404
1360E	Polygon dp, graphs, implementation, shortest paths	1300	x25292
1360D	Buying Shovels math, number theory	1300	x33153
1360C	Similar Pairs constructive algorithms, graph matchings, greedy, sortings	1100	x32848
1360B	Honest Coach greedy, sortings	800	x47884
1360A	Minimal Square greedy, math	800	x50515
1359F	RC Kaboom Show binary search, brute force, data structures, geometry, math	2900	x541
1359E	Modular Stability combinatorics, math, number theory	2000	x6112
1359D	Yet Another Yet Another Task data structures, dp, implementation, two pointers	2000	x9454
1359C	Mixing Water binary search, math	1700	x13826
1359B	New Theatre Square brute force, dp, greedy, implementation, two pointers	1000	x27790
1359A	Berland Poker brute force, greedy, math	1000	x29625
1358F	Tasty Cookie binary search, constructive algorithms, greedy, implementation	2700	x451
1358E	Are You Fired? constructive algorithms, data structures, greedy, implementation	2400	x2320
1358D	The Best Vacation binary search, brute force, greedy, implementation, two pointers	1900	x8158
1358C	Celex Update math	1600	x17378
1358B	Maria Breaks the Self-isolation greedy, sortings	1000	x24920
1358A	Park Lighting greedy, math	800	x39404
1357E2	Root of quantum Fourier transform		x51
1357E1	Power of quantum Fourier transform		x193
1357D5	Quantum Classification - Dataset 7		x82
1357D4	Quantum Classification - Dataset 6		x85
1357D3	Quantum Classification - Dataset 5		x105
1357D2	Quantum Classification - Dataset 4		x112
1357D1	Quantum Classification - Dataset 3		x125
1357C2	Prepare superposition of basis states with the same parity		x303
1357C1	Prepare superposition of basis states with 0s		x348
1357B2	"Is the number divisible by 3?" oracle		x214
1357B1	"Is the bit string balanced?" oracle		x214
1357A7	Distinguish Y, XZ, -Y and -XZ		x182
1357A6	Distinguish four Pauli gates		x167
1357A5	Distinguish Rz(θ) from Ry(θ)		x240
1357A4	Distinguish Rz from R1		x352
1357A3	Distinguish H from X		x479
1357A2	Distinguish I, CNOTs and SWAP		x511
1357A1	Figure out direction of CNOT		x632
1356D2	Quantum Classification - 2 *special problem		x128
1356D1	Quantum Classification - 1 *special problem		x137
1356C	Prepare state \|01⟩ + \|10⟩ + \|11⟩ *special problem		x303
1356B2	Decrement *special problem		x283
1356B1	Increment *special problem		x283
1356A5	Distinguish Z from -Z *special problem		x331
1356A4	Distinguish I ⊗ X from CNOT *special problem		x459
1356A3	Distinguish Z from S *special problem		x461
1356A2	Distinguish I from Z *special problem		x488
1356A1	Distinguish I from X *special problem		x603
1355F	Guess Divisors Count constructive algorithms, interactive, number theory	2600	x861
1355E	Restorer Distance binary search, greedy, math, sortings, ternary search	2100	x5126
1355D	Game With Array constructive algorithms, math	1400	x18029
1355C	Count Triangles binary search, implementation, math, two pointers	1800	x10647
1355B	Young Explorers dp, greedy, sortings	1200	x25671
1355A	Sequence with Digits brute force, implementation, math	1200	x26571
1354G	Find a Gift binary search, interactive, probabilities	2600	x786
1354F	Summoning Minions constructive algorithms, dp, flows, graph matchings, greedy, sortings	2500	x1225
1354E	Graph Coloring dfs and similar, dp, graphs	2100	x3330
1354D	Multiset binary search, data structures	1900	x8772
1354C2	Not So Simple Polygon Embedding binary search, brute force, geometry, math	2000	x6075
1354C1	Simple Polygon Embedding binary search, geometry, math, ternary search	1400	x15684
1354B	Ternary String binary search, dp, implementation, two pointers	1200	x30900
1354A	Alarm Clock math	900	x23785
1353F	Decreasing Heights brute force, dp	2200	x3327
1353E	K-periodic Garland brute force, dp, greedy	1900	x7144
1353D	Constructing the Array constructive algorithms, data structures, sortings	1600	x18097
1353C	Board Moves math	1000	x35412
1353B	Two Arrays And Swaps greedy, sortings	800	x49583
1353A	Most Unstable Array constructive algorithms, greedy, math	800	x40638
1352G	Special Permutation constructive algorithms	1600	x21208