题目链接

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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