This paper analyzes the "nine different numerals constitute a equation of multiplication",designs a recursive backtrack algorithm and non-recursive backtrack algorithm,gives the general design for exhaustive algorithm of NP problem,and at the same time,compares the characteristics of two algorithms,and experimental testing.

This paper analyzes the "nine different numerals constitute a equation of multiplication",designs a recursive backtrack algorithm and non-recursive backtrack algorithm,gives the general design for exhaustive algorithm of NP problem,and at the same time,compares the characteristics of two algorithms,and experimental testing.

It is realized through recursive backtracking method.

Application and research of backtracking algorithm based on matrix storage in multi-constraint assignment problem;

Discussion about Backtracking Algorithm of n-Queen Problem;

Problems search algorithm based on the broad first backtracking algorithm;

A fast recursive algorithm of discrete Hartley transform;

Building treeview with recursive algorithm in JSP;

Mathematical Model and Its Recursive Algorithm for Intelligently Editing and Recording CD Tracks;

Realistic rendering of trees based on fractal recursion algorithm;

Modal-domain modelling of frequency-dependent overhead lines based on recursion algorithm;

a Recursion Algorithm to Seek the Characteristic Value of Real Symmetric Tri-diagonal Matrix;