代码会做完一题上传一题。
1、bool数组最好初始化，因为不是全部默认值为false
2、自非不能简写为!=，必须写为res = !res
1、区间查询类型的题目处理：线段树/差分数组
1、bool数组最好初始化，因为不是全部默认值为false
2、自非不能简写为!=，必须写为res = !res
1、区间查询类型的题目处理：线段树/差分数组
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1、bool数组最好初始化，因为不是全部默认值为false
2、自非不能简写为!=，必须写为res = !res
1、区间查询类型的题目处理：线段树/差分数组
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