def is_triangle(a, b, c):
if (a<=0 or b<=0 or c<=0):
return -1
elif((a+b)>c and (a+c)>b and (b+c)>a):
return 1
else:
return 0
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def is_triangle(a, b, c):
if (a<=0 or b<=0 or c<=0):
return -1
elif((a+b)>c and (a+c)>b and (b+c)>a):
return 1
else:
return 0