Starlight: List of Problems

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Over 20,000 problems available. AMC 8/10/12 and AIME problems from 2010-2023; USAJMO/USAMO problems from 2002-2023 available. USACO problems from 2014 to 2023 (all divisions). Codeforces, AtCoder, DMOJ problems are added daily around 04:00 AM UTC, which may cause disruptions.

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ID Problem Name (click to add insights/hints, view summary of insights/hints and similar problems)
1121 Codeforces 242E: XOR on Segment
1120 Codeforces 242D: Dispute
1119 Codeforces 242C: King's Path
1118 Codeforces 242B: Big Segment
1117 Codeforces 242A: Heads or Tails
1116 Codeforces 241G: Challenging Balloons
1115 Codeforces 241F: Race
1114 Codeforces 241E: Flights
1113 Codeforces 241D: Numbers
1112 Codeforces 241C: Mirror Box
1111 Codeforces 241B: Friends
1110 Codeforces 241A: Old Peykan
1109 Codeforces 240F: TorCoder
1108 Codeforces 240E: Road Repairs
1107 Codeforces 239B: Easy Tape Programming
1106 Codeforces 239A: Two Bags of Potatoes
1105 Codeforces 238E: Meeting Her
1104 Codeforces 238D: Tape Programming
1103 Codeforces 238C: World Eater Brothers
1102 Codeforces 238B: Boring Partition
1101 Codeforces 238A: Not Wool Sequences
1100 Codeforces 237E: Build String
1099 Codeforces 237D: T-decomposition
1098 Codeforces 237C: Primes on Interval
1097 Codeforces 237B: Young Table
1096 Codeforces 237A: Free Cash
1095 Codeforces 236B: Easy Number Challenge
1094 Codeforces 236A: Boy or Girl
1093 Codeforces 235E: Number Challenge
1092 Codeforces 235D: Graph Game
1091 Codeforces 235C: Cyclical Quest
1090 Codeforces 235B: Let's Play Osu!
1089 Codeforces 235A: LCM Challenge
1088 Codeforces 234H: Merging Two Decks
1087 Codeforces 234G: Practice
1086 Codeforces 234F: Fence
1085 Codeforces 234E: Champions' League
1084 Codeforces 234D: Cinema
1083 Codeforces 234C: Weather
1082 Codeforces 234B: Reading
1081 Codeforces 234A: Lefthanders and Righthanders
1080 Codeforces 233B: Non-square Equation
1079 Codeforces 233A: Perfect Permutation
1078 Codeforces 232E: Quick Tortoise
1077 Codeforces 232D: Fence
1076 Codeforces 232C: Doe Graphs
1075 Codeforces 232B: Table
1074 Codeforces 232A: Cycles
1073 Codeforces 231E: Cactus
1072 Codeforces 231D: Magic Box
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