Given a system of difference constraints. Let G=(V,E) be the corresponding constraint graph. By applying BELLMAN_FORD's algorithm on v0 (v0 is the source vertex), the number of vertices who's shortest paths will be updated is at the second iteration. x1 - x2 ≤ 7 x1 - x3 ≤ 6 x2 - x4 ≤ -3 x3 - x4 ≤ -2 x4 - x1 ≤ -3

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