再用n2的时间（两重循环）枚举d-c，并将b-c的值作为键，在Hash数组中查找是否存在。如果能找到critical相同的node点，则找到了一组满足 d-c = a+b的值。（注意检查a b c d 四个数不重复） All emblems are either the assets of Central Back garden & Pet Business, its subsidiaries, divisions, affiliated and/or connected corporations or perhaps the residence in their respective entrepreneurs. ● सीधे ऐप... https://pearlaquatics.my/how-to-build-a-fish-pond-at-your-backyard/