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线段树

2021

Codeforces Round 737 D.Ezzat and Grid 08-10

2020-2021 ACM-ICPC Brazil Subregional Programming Contest M. Machine Gun 02-18

XIX Open Cup Grand Prix of Korea K.Interesting Drug 02-01

2020杭电多校第8场 B.Breaking Down News 01-30

Codeforces Educational Round 90 G.Pawns 01-25