Description: visual demostration in vc of eight queens problem.
algorithm: backtracking.
First, put a queen on first line then find a suitable position on 2nd line for next queen, and so on. When all eight lines have queens, it means we have find a solution. If we put the i-th queen, but can find a suitable position on the (i+1)th line, then back to the ith line and move the queen on the ith line to next suitable position and move on to the next line. Repeat this until we have found all the solutions. Note:By this mean, some solutions maybe equivalent to others, some can be acquired by the rotation of other solutions.
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