ramay7

Problem Description In the new year party, everybody will get a "special present".Now it's your turn to get your special present, a lot of presents now putting on the desk, and only one of them wil

题目链接： HDU 5661 Claris and XOR 题意： 给定区间[a,b][a,b]和[c,d][c,d]，求x∈[a,b]x\in [a,b]，y∈[c,d]y\in [c,d]使得x异或yx异或y的值最大？输出最大的值。 数据范围：a≤b≤1018,c≤d≤1018a\leq b \leq 10^{18},c\leq d \leq 10^{18}。 分析： 从后往