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1799 Maximize Score After N Operations C++ Python O(n^2 * 2^n) O(2^n) Hard 1803 Count Pairs With XOR in a Range C++ Python O(n) O(n) Hard DP, Trie 1857 Largest Color Value in a Directed Graph C++ Python O(n + m) O(n + m) Hard DP, Topological Sort 1866 Number of Way...