}//若当前位置已有数值，则索引指向下一个位置，直到键值对插入完成
private void Resize(int cap)
{
LinearProbingHashST <Key, Value> t = new LinearProbingHashST <Key, Value>(cap);
for (int i = 0; i < M; i++)
{
if (keys[i] != null)
{
t.Put(keys[i], vals[i]);
}
}
keys = t.keys;
vals = t.vals;
M = t.M;
}
public SparseVector(int m)
{
st = new LinearProbingHashST <Int32, Double>(m);
}