Determinism versus Nondeterminism for Linear Time RAMs with Memory Restrictions

Determinism versus Nondeterminism for Linear Time RAMs with Memory Restrictions
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具有内存限制的线性时间 RAM 的确定性与非确定性

DOI:
10.1006/jcss.2002.1821
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发表时间:
2002
期刊:
Electron. Colloquium Comput. Complex.
影响因子:
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通讯作者:
M. Ajtai
M. Ajtai
中科院分区:
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文献类型:
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作者:
M. Ajtai

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我们的计算模型是一个随机存取机与n个只读输入寄存器,每个包含c日志n位的信息和一个读写存储器。我们通过访问输入寄存器的次数来测量时间。我们表明,对于所有的k有一个e > 0,因此,如果n是足够大的,那么元素的独特性问题不能解决的时间kn与en位的读写存储器,也就是说,没有机器的参数,决定是否有两个不同的输入寄存器的内容是相同的。
Our computational model is a random access machine with n read only input registers each containing c log n bits of information and a read and write memory. We measure the time by the number of accesses to the input registers. We show that for all k there is an e > 0 so that if n is sufficiently large then the elements distinctness problem cannot be solved in time kn with en bits of read and write memory; that is, there is no machine with this value of the parameters which decides whether there are two different input registers whose contents are identical.