Problemset - Codeforces

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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
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Problems

#	Name
1286C2	Madhouse (Hard version) brute force, constructive algorithms, hashing, interactive, math	2800	x674
1286C1	Madhouse (Easy version) brute force, constructive algorithms, interactive, math	2400	x1456
1285C	Fadi and LCM brute force, math, number theory	1400	x23819
1285A	Mezo Playing Zoma math	800	x28402
1284F	New Year and Social Network data structures, graph matchings, graphs, math, trees	3200	x326
1284E	New Year and Castle Construction combinatorics, geometry, math, sortings	2500	x1305
1284C	New Year and Permutation combinatorics, math	1600	x8095
1283C	Friends and Gifts constructive algorithms, data structures, math	1500	x13198
1283B	Candies Division math	900	x21815
1283A	Minutes Before the New Year math	800	x51386
1282A	Temporarily unavailable implementation, math	900	x14909
1280F	Intergalactic Sliding Puzzle combinatorics, constructive algorithms, math	3400	x66
1280E	Kirchhoff's Current Loss math	2900	x203
1280B	Beingawesomeism implementation, math	1800	x4009
1280A	Cut and Paste implementation, math	1700	x5466
1279D	Santa's Bot combinatorics, math, probabilities	1700	x6409
1279A	New Year Garland math	900	x16984
1278F	Cards combinatorics, dp, math, number theory, probabilities	2600	x1927
1278B	A and B greedy, math	1500	x13391
1277D	Let's Play the Words? data structures, hashing, implementation, math	1900	x3130
1276C	Beautiful Rectangle brute force, combinatorics, constructive algorithms, data structures, greedy, math	2300	x1675
1272A	Three Friends brute force, greedy, math, sortings	900	x20780
1271E	Common Number binary search, combinatorics, dp, math	2100	x3459
1271B	Blocks greedy, math	1300	x11408
1271A	Suits brute force, greedy, math	800	x15001
1270I	Xor on Figures constructive algorithms, fft, math	3500	x241
1270G	Subset with Zero Sum constructive algorithms, dfs and similar, graphs, math	2700	x2312
1270F	Awesome Substrings math, strings	2600	x1152
1270E	Divide Points constructive algorithms, geometry, math	2300	x2394
1270D	Strange Device constructive algorithms, interactive, math, sortings	1900	x4699
1270C	Make Good bitmasks, constructive algorithms, math	1400	x14172
1270B	Interesting Subarray constructive algorithms, greedy, math	1200	x16452
1270A	Card Game games, greedy, math	800	x17036
1269A	Equation brute force, math	800	x21822
1268D	Invertation in Tournament brute force, divide and conquer, graphs, math	3200	x537
1268B	Domino for Young dp, greedy, math	2000	x6006
1267K	Key Storage combinatorics, math	2100	x1969
1267J	Just Arrange the Icons greedy, implementation, math	1800	x2873
1267G	Game Relics math, probabilities	3000	x680
1266H	Red-Blue Graph dp, graphs, math, matrices, meet-in-the-middle	3400	x104
1266D	Decreasing Debts constructive algorithms, data structures, graphs, greedy, implementation, math, two pointers	2000	x3650
1266C	Diverse Matrix constructive algorithms, greedy, math, number theory	1400	x9728
1266B	Dice Tower constructive algorithms, math	1000	x15170
1266A	Competitive Programmer chinese remainder theorem, math	1000	x16006
1265E	Beautiful Mirrors data structures, dp, math, probabilities	2100	x3760
1265B	Beautiful Numbers data structures, implementation, math, two pointers	1300	x12744
1263C	Everyone is a Winner! binary search, math, meet-in-the-middle, number theory	1400	x13798
1263A	Sweet Problem math	1100	x16404
1261F	Xor-Set bitmasks, divide and conquer, math	3100	x398
1260C	Infinite Fence greedy, math, number theory	1700	x8274
1260B	Obtain Two Zeroes binary search, math	1300	x15869
1260A	Heating math	1000	x14841
1257G	Divisor Set divide and conquer, fft, greedy, math, number theory	2600	x619
1257B	Magic Stick math	1000	x21088
1257A	Two Rival Students greedy, math	800	x20650
1256A	Payment Without Change math	1000	x29801
1255A	Changing Volume math	800	x17298
1254C	Point Ordering constructive algorithms, geometry, interactive, math	2300	x1457
1254B2	Send Boxes to Alice (Hard Version) constructive algorithms, greedy, math, number theory, ternary search, two pointers	2100	x3205
1254B1	Send Boxes to Alice (Easy Version) constructive algorithms, greedy, math, number theory, ternary search, two pointers	1800	x4695
1253C	Sweets Eating dp, greedy, math, sortings	1500	x14376
1252K	Addition Robot data structures, math, matrices	2100	x1872
1250L	Divide The Students binary search, greedy, math	1500	x4130
1250H	Happy Birthday math	1500	x4068
1250B	The Feast and the Bus brute force, constructive algorithms, greedy, math	1800	x2619
1249C2	Good Numbers (hard version) binary search, greedy, math, meet-in-the-middle	1500	x12711
1249B2	Books Exchange (hard version) dfs and similar, dsu, math	1300	x16941
1249B1	Books Exchange (easy version) dsu, math	1000	x20805
1249A	Yet Another Dividing into Teams math	800	x22561
1248B	Grow The Tree greedy, math, sortings	900	x16960
1248A	Integer Points geometry, math	1000	x14187
1245A	Good ol' Numbers Coloring math, number theory	1000	x14271
1244G	Running in Pairs constructive algorithms, greedy, math	2400	x1365
1244C	The Football Season brute force, math, number theory	2000	x7673
1244A	Pens and Pencils math	800	x19311
1242D	Number Discovery math	3400	x199
1242A	Tile Painting constructive algorithms, math, number theory	1500	x12671
1239A	Ivan the Fool and the Probability Theory combinatorics, dp, math	1700	x7380
1238C	Standard Free2play dp, greedy, math	1600	x7449
1238A	Prime Subtraction math, number theory	900	x24564
1237E	Balanced Binary Search Trees dp, math	2400	x1339
1237A	Balanced Rating Changes implementation, math	1000	x20074
1236F	Alice and the Cactus dfs and similar, graphs, math, probabilities	3000	x177
1236B	Alice and the List of Presents combinatorics, math	1500	x11146
1236A	Stones brute force, greedy, math	800	x16487
1234E	Special Permutations math	2000	x2797
1234A	Equalize Prices Again math	800	x27917
1228E	Another Filling the Grid combinatorics, dp, math	2300	x2788
1228C	Primes and Multiplication math, number theory	1700	x9080
1228B	Filling the Grid implementation, math	1400	x11562
1227F2	Wrong Answer on test 233 (Hard Version) combinatorics, math	2400	x1535
1227A	Math Problem math	1100	x9840
1225D	Power Products hashing, math, number theory	1800	x8167
1225C	p-binary bitmasks, brute force, math	1600	x9037
1225A	Forgetting Things math	900	x15861
1223G	Wooden Raft binary search, math, number theory	3200	x250
1223A	CME math	800	x21662
1221C	Perfect Team binary search, math	1200	x21319
1221A	2048 Game brute force, greedy, math	1000	x17008
1220D	Alex and Julian bitmasks, math, number theory	1900	x3921