x=int(input())

for i in range(1,(x+1)):

 y=list(map(int,input().split()))

 y.sort()

 if (y[0]+y[1]<y[2])or(y[0]<=0)or(y[1]<=0)or(y[2]<=0):

  print("Case ",i,": Invalid",sep="")

 elif (y[0]==y[1])and(y[1]==y[2]):

   print("Case ",i,": Equilateral",sep="")

 elif (y[0]==y[1])or(y[1]==y[2]):

   print("Case ",i,": Isosceles",sep="")

 else:

   print("Case ",i,": Scalene",sep="")

• Isosceles  - 恰有兩邊等長  <-- 這個狀況。

 

 if (y[0]+y[1]<y[2])or(y[0]<=0)or(y[1]<=0)or(y[2]<=0):

 

y[0]+y[1]剛好等於y[2]也無法形成三角形

 

 if (y[0]+y[1]

 

y[0]+y[1]剛好等於y[2]也無法形成三角形

AC了!!謝謝<3