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一组数据，题目数据没考虑这里，过不了也能AC4 2 1 1 2 2 3 4 4 3 4 5 -1 差分约束系统判断可行解方法是，从额外点0向每一个顶点连一条权值为0的边，然后以0为源点判断是否存在负环...（不等式是<=时判断负环，不等式是>=时判断正环..） 个人理解，有错误请指正... Followed by: Post your reply here: |
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