hackerrank---List Comprehensions
刷刷Python基本功...列表解析
附上代码:
x = int(input())
y = int(input())
z = int(input())
n = int(input())
print [[i, j, k] for i in xrange(x+1) for j in xrange(y+1) for k in xrange(z+1) if i+j+k != n]
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