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240 Just Kingdom data structures dfs and similar Statement J ICPC WF Moscow Invitational Contest - Online Mirror (Unrated, ICPC Rules, Teams Preferred) {1578} PROGRAMMING Tutorial (PDF)
293 Frequency Queries data structures dfs and similar Statement E Codeforces Round 759 (Div. 2, based on Technocup 2022 Elimination Round 3) {1591} PROGRAMMING 2500.0 Codeforces Round #759 (Div. 2, based on Technocup 2022 Elimination Round 3) Editorial