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642 Rectangular Polyline constructive algorithms dp geometry Statement D Codeforces Round 680 (Div. 1, based on Moscow Team Olympiad) {1444} PROGRAMMING 2000.0 Codeforces Round #680 Editorial
1399 City Union constructive algorithms dp geometry greedy implementation math Statement E Codeforces Round 854 by cybercats (Div. 1 + Div. 2) {1799} PROGRAMMING 2250.0 Codeforces Round #854 Editorial
30 Draw Polygon Lines *special constructive algorithms dp geometry interactive Statement A XVIII Open Olympiad in Informatics - Final Stage, Day 1 (Unrated, Online Mirror, IOI rules) {1939} PROGRAMMING