🔤 字母B
20797Assume that {A, B, C, D} are variables, the domain of each variable is {u, v, w}, and != denotes not equal, select which of the following expressions is a binary constraint on CSP formalism?设{A, B, C, D}为变量,每个变量的域是{u, v, w},且“!=”表示不等于,从如下表达式中选择那个是CSP形式化的2