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1855 Excellent Arrays brute force combinatorics constructive algorithms implementation math Statement D Educational Codeforces Round 111 (Rated for Div. 2) {1550} PROGRAMMING Educational Codeforces Round 111 Editorial
3123 Expand the Path brute force combinatorics implementation math Statement E Educational Codeforces Round 123 (Rated for Div. 2) {1644} PROGRAMMING 100227