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671BRobin Hood2000binary search, greedy675AInfinite Sequence1100math675BRestoring Painting1400brute force, constructive algorithms, math675CMoney Transfers2100constructive algorithms, data structures, greedy675DTree Construction1800data structures, trees675ETrains and Statistic2300data structures, dp, greedy678CJoty and Chocolate1600implementation, math, number theory678DIterated Linear Function1700math, number theory678EAnother Sith Tournament2200bitmasks, dp, math679ABear and Prime 1001400constructive algorithms, interactive, math679BBear and Tower of Cubes2200binary search, dp, greedy688BLovely Palindromes1000constructive algorithms, math689BMike and Shortcuts1600dfs and similar, graphs, greedy689CMike and Chocolate Thieves1700binary search, combinatorics, math689DFriends and Subsequences2100binary search, data structures689EMike and Geometry Problem2000combinatorics, data structures, dp68BEnergy exchange1600binary search690C2Brain Network (medium)1500dfs and similar, graphs, trees690C3Brain Network (hard)2200trees690D3The Wall (hard)2100dp691DSwaps in Permutation1700dfs and similar, dsu, math691FCouple Cover2200brute force, dp, number theory695ALRU2400bitmasks, dp, math698AVacations1400dp698BFix a Tree1700constructive algorithms, dfs and similar, dsu69AYoung Physicist1000implementation, math69BBets1200greedy, implementation69DDot1900dp, games6CAlice, Bob and Chocolate1200greedy, two pointers6EExposition1900binary search, data structures, dsu700AAs Fast As Possible1900binary search, math700BConnecting Universities1800dfs and similar, dp, graphs701BCells Not Under Attack1200data structures, math701CThey Are Everywhere1500binary search, strings, two pointers705BSpider Man1100games, math709BCheckpoints1500greedy, implementation, sortings70ACookies1300math70BText Messaging1600expression parsing, greedy, strings70CLucky Tickets2200binary search, data structures, sortings711CColoring Trees1700dp711DDirected Roads1900combinatorics, dfs and similar, graphs711EZS and The Birthday Paradox2300math, number theory, probabilities715APlus and Square Root1600constructive algorithms, math715BComplete The Graph2300binary search, constructive algorithms, graphs718AEfim and Strange Grade1700dp, implementation, math718CSasha and Array2300data structures, math, matrices719BAnatoly and Cockroaches1400greedy71BProgress Bar1300implementation, math71CRound Table Knights1600dp, math, number theory71ENuclear Fusion2200bitmasks, dp
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