The HEWC problem was formulated as an integer linear program, and an approximation solution was obtained by using LP-relation and rounding heuristic.
HEWC问题第一次被归结为一个整数线性规划问题，并且利用LP的放松问题和有界启发得到一个近似解。
If all the functions are linear, the problem is of a linear integer program.
如果问题中的所有函数都是线性的，那就是线性整数规划问题。
If all the functions are linear, the problem is of a linear integer program.
如果问题中的所有函数都是线性的，那就是线性整数规划问题。
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