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内详

Posted by ANewStart at 2004-09-30 17:06:33 on Problem 1859
In Reply To:^_^,这可是你怂恿我的 Posted by:hawk at 2004-09-29 22:10:19
貌似这个题目相当的诡异。其实nlogn是可以过的。
我当时TLE了两次,一直没想通。
我用的是<algorithm>里的sort。排序准则:
if(a.x == b.x) return a.y < b.y;
return a.x < b.x;

这样会TLE

但是如果把准则改成:
if(a.y == b.y) return a.x < b.x;
return a.y < b.y;

就过了。 太诡异了。想不通。请高人指点。
貌似sort这个东西不稳定啊。。会退化?

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