根据你的约束:
for n in all_nurses: for d in all_days: model.Add(sum([shifts[(n, d, 1)], shifts[(n, (d+1)%7, 0)]]) <= 1)
一个更好的配方是
for n in all_nurses: for d in all_days: model.AddBoolOr([shifts[(n, d, 1)].Not(), shifts[(n, (d + 1) % 7, 0)].Not()])
参考: https://github.com/google/or-tools/blob/aa0c6c42a523ee4c23633585b86fb6d3e090f8c8/ortools/sat/samples/bool_or_sample_sat.py#L23-L28