public long Compute1(uint years)
{
//初始化为1头牛
long count = 1;
if (years <= 3)
{
return count;
}
int i = 4;
while (i <= years)
{
int subYears = i - 3;
count += Compute1((uint)(subYears));
i++;
}
return (long)count;
}
Hashtable table = new Hashtable();
public long Compute(uint years)
{
//初始化为1头牛
long count = 1;
if (years <= 3)
{
return count;
}
int i = 4;
while (i <= years)
{
int subYears = i - 3;
if (table.ContainsKey(subYears))
{
count = (long)table[subYears];
}
else
{
count += Compute((uint)(subYears));
}
if (!table.ContainsKey(subYears))
{
table.Add(subYears, count);
}
i++;
}
return (long)count;
}
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