這個題需要分情況討論。如果是grid，就能直接算，如果是skew，就一層層往上模擬著堆。最后取最大值。
/**//*************************************************************************
Author: WHU_GCC
Created Time: 2007-9-21 20:52:46
File Name: pku1319.cpp
Description:
************************************************************************/
#include <iostream>
#include <cmath>
using namespace std;
#define out(x) (cout << #x << ": " << x << endl)
typedef long long int64;
const int maxint = 0x7FFFFFFF;
const int64 maxint64 = 0x7FFFFFFFFFFFFFFFLL;
template <class T> void show(T a, int n) 
{ for (int i = 0; i < n; ++i) cout << a[i] << ' '; cout << endl; }
template <class T> void show(T a, int r, int l) { for (int i = 0; i < r; ++i) show(a[i], l); cout << endl; }
int g, s;
void max_pipes(double w, double h)
{
if (h < 1 || w < 1)
return;
//grid
int grid = int(w) * int(h);
//skew
int skew = 0;
double now_h = 1.0;
int flag = 0;
for (now_h = 1.0 ;now_h < h; now_h += sqrt(3.0) / 2.0)
{
if (w >= int(w) + 0.5)
{
skew += int(w);
continue;
}
if (flag == 0)
{
flag = 1;
skew += int(w);
}
else
{
flag = 0;
skew += int(w) - 1;
}
}
g >?= grid;
s >?= skew;
}
int main()
{
double w, h;
while (scanf("%lf%lf", &w, &h) != EOF)
{
g = 0;
s = 0;
max_pipes(w, h);
max_pipes(h, w);
if (g >= s)
printf("%d grid\n", g);
else
printf("%d skew\n", s);
}
return 0;
}