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你不如说用基数排序In Reply To:用归排序 Posted by:gemenhao at 2006-03-30 13:00:12 瓶颈根本不在这里
> 输入的四个数组排序,两两相加后用归并排序会比快排更快
> 不信试试看
> 在处理a+b+c+d=0
> 可以写作 a + b= - c -d
> c 和d 的数组取反
> 这样只要查找 两两数组中相等的就可
> 查找的核心代码
> __int64 cnt = 0;
> int p1 = 0,p2 = 0;
> while(p1 < n && p2 < n)
> {
> if(n1[p1] > n2[p2])
> p2++;
> else if(n1[p1] < n2[p2])
> p1++;
> else
> {
> int c1 = 1,c2 = 1;
> p1++,p2++;
> while(n1[p1-1] == n1[p1] && p1++ < n)
> c1++;
> while(n2[p2-1] == n2[p2] && p2++ < n)
> c2++;
> cnt += c1*c2;
> }
> }
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