2014
01-05

# Settling Salesman Problem

After travelling around for years, Salesman John has decided to settle. He wants to build a new house close to his customers, so he doesn’t have to travel as much any more. Luckily John knows the location of all of his customers.
All of the customers’ locations are at (distinct) integer coordinates. John’s new house should also be built on integer coordinates, which cannot be the same as any of the customers’ locations. Since John lives in a large and crowded city, the travelling distance to any customer is the Manhattan distance: |x – xi| + |y – yi|, where (x, y) and (xi, yi) are the coordinates of the new house and a customer respectively.
What is the number of locations where John could settle, so the sum of the distance to all of his customers is as low as posible?

On the first line an integer t (1 <= t <= 100): the number of test cases. Then for each test case:

One line with an integer n (1 <= n <= 2 000): the number of customers John has.

n lines with two integers xi and yi (-1 000 000 000 <= xi, yi <= 1 000 000 000): the coordinates of the i-th customer.

On the first line an integer t (1 <= t <= 100): the number of test cases. Then for each test case:

One line with an integer n (1 <= n <= 2 000): the number of customers John has.

n lines with two integers xi and yi (-1 000 000 000 <= xi, yi <= 1 000 000 000): the coordinates of the i-th customer.

2
4
1 -3
0 1
-2 1
1 -1
2
-999888777 1000000000
1000000000 -987654321

10 4
3987543098 3975087573110998514

1. 其实国内大部分公司对算法都不够重视。特别是中小型公司老板根本都不懂技术，也不懂什么是算法，从而也不要求程序员懂什么算法，做程序从来不考虑性能问题，只要页面能显示出来就是好程序，这是国内的现状，很无奈。

2. 漂亮。佩服。
P.S. unsigned 应该去掉。换行符是n 不是/n
还可以稍微优化一下，
int main() {
int m,n,ai,aj,bi,bj,ak,bk;
while (scanf("%d%d",&m,&n)!=EOF) {
ai = sqrt(m-1);
bi = sqrt(n-1);
aj = (m-ai*ai-1)>>1;
bj = (n-bi*bi-1)>>1;
ak = ((ai+1)*(ai+1)-m)>>1;
bk = ((bi+1)*(bi+1)-n)>>1;
printf("%dn",abs(ai-bi)+abs(aj-bj)+abs(ak-bk));
}
}