* [89] Gray Code * * The gray code is a binary numeral system where two successive values differ in only one bit. * * Given a non-negative integer n representing the total number of bits in the code, print the sequence of gray code. A gray code sequence must begin with 0. * * Example 1: * * * Input: 2 * Output: [0,1,3,2] * Explanation: * 00 - 0 * 01 - 1 * 11 - 3 * 10
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