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15386 Minimum Ties brute force constructive algorithms dfs and similar graphs greedy implementation math Statement C Educational Codeforces Round 104 (Rated for Div. 2) {1487} PROGRAMMING 87873
1288 Almost Fault-Tolerant Database brute force constructive algorithms dfs and similar greedy implementation Statement E Codeforces Round 704 (Div. 2) {1492} PROGRAMMING 3000.0 Codeforces Round #704 Editorial