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从甲开始走的话终点是d(遇到横就是走离横靠近的路,规则有写)
d=-15+37-(-8)-52=-22
以此类推就是从乙开始,终点是c
c=37+(-15)-37-8=-23
从丙开始,终点是b
b=-8+52-(-8)+37=89