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8750 Xenia and Weights constructive algorithms dfs and similar dp graphs greedy shortest paths Statement C Codeforces Round 197 (Div. 2) {339} PROGRAMMING Codeforces Round #197 — Tutorial 1700
1885 Egor in the Republic of Dagestan constructive algorithms dfs and similar dp graphs greedy shortest paths Statement E Codeforces Round 669 (Div. 2) {1407} PROGRAMMING 2500.0 Codeforces Round #669 Editorial
3724 Alice's Adventures in Cards constructive algorithms data structures dfs and similar dp graphs greedy implementation shortest paths Statement D Codeforces Round 986 (Div. 2) {2028} PROGRAMMING 1750.0 Codeforces Round 986 (Div. 2) Editorial