Codeforces 703D Mishka and Interesting sum 离线+树状数组
2016-08-05 21:07
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链接
题意
求区间内数字出现次数为偶数的数的异或和
思路
区间内直接异或的话得到的是出现次数为奇数的异或和，要得到偶数的需要把区间内出现过的数字不重复的再异或一遍。离线按右端点排序，每次处理一个区间时，如果该数字出现过，则在树状数组中把这个数删去，再重新再该位置加到树状数组中。
代码
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