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关于离线方法的问题我看网上很多人把输入查询先按x再按y排序后查询这么写: for(j=q[i-1].x;j<q[i].x;++j)delete(pretty[j]); for(j=q[i-1].y+1;j<=q[i].y;++j)insert(pretty[j]); x一定是删除没错,但是y为啥非得是递增的啊?如果查询是先(1,7)再(2,6),不就挂了么? 求大神指教,感激不尽。 Followed by:
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