给你一个不等式方程组,请你求出某个二个未知数差的最大值
见样例,最后行是请你求二者差的最大值
一个整数,如果无解输入N
x1 x2 <= 2 x2 x0 <= 7 x3 x0 <= 8 x2 x1 <= 3 x2 x1 <= 3 x3 x2 <= 2 x3 x0
7
x1 x2 <= 1 x2 x3 <= -5 x3 x1 <= 2 x4 x1 <= 3 x3 x5 <= 7 x4 x5
N
未知数最多到x9,注意题目里可能有重复的式子;
样例说明
x1- x2 <= 2
x2- x0 <= 7
x3- x0 <= 8
x2- x1 <= 3
x2- x1 <= 3
x3- x2 <= 2
求x3 -x0的最大值