After the instantiation of a variable, constraint propagation is implemented, the constraint that each slab is visited only once is guaranteed and the subtour is dynamically forbidden.
为变量赋值之后，实施约束传播，保证每块板坯只被访问一次并动态禁止子回路。
After the instantiation of a variable, constraint propagation is implemented, the constraint that each slab is visited only once is guaranteed and the subtour is dynamically forbidden.
为变量赋值之后，实施约束传播，保证每块板坯只被访问一次并动态禁止子回路。
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