The revised simplex method is used at first to calculate the optimal line extensions without integer constraints of the variables so that it can be determined which lines should be constructed.
第一步不考虑变量的整数约束，用修正单纯形法求解，由此可确定一部分线路是否需要建设。
The revised simplex method is used at first to calculate the optimal line extensions without integer constraints of the variables so that it can be determined which lines should be constructed.
第一步不考虑变量的整数约束，用修正单纯形法求解，由此可确定一部分线路是否需要建设。
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