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29393 XOR Mixup bitmasks brute force Statement A Codeforces Round 803 (Div. 2) {1698} PROGRAMMING 250.0 Codeforces Round #803 (Div. 2) Editorial
24211 We Need the Zero bitmasks brute force Statement A Codeforces Round 862 (Div. 2) {1805} PROGRAMMING 500.0 Editorial of Codeforces Round #862 (Div. 2)