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1411 Chessboard Billiard dfs and similar dsu graphs number theory Statement C Codeforces Beta Round 68 {74} PROGRAMMING Solutions for Codeforces Beta Round #68 2100
2172 Table Compression dfs and similar dp dsu graphs greedy Statement C Codeforces Round 345 (Div. 1) {650} PROGRAMMING Codeforces Round #345: editorial 2300
9213 0-1 MST dfs and similar dsu graphs sortings Statement B Codeforces Round 599 (Div. 1) {1242} PROGRAMMING Codeforces Round #599 Editorial 1900
2481 Red Light, Green Light (Hard version) binary search dfs and similar dp dsu graphs implementation number theory Statement D2 Codeforces Round 1030 (Div. 2) {2118} PROGRAMMING 1000.0 Codeforces Round 1030 (Div. 2) Editorial