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ft！ The input is terminated by a line containing three -1 values. 请看一下这一句：“The input is terminated by a line containing three -1 values.”
应该用：while(a!=-1 || b!=-1 || c!=-1){ ... }吧？？？
因为：
!(a==-1 && b==-1 && c==-1） ==> a!=-1 || b!=-1 || c!=-1
可是while(a!=-1 && b!=-1 && c!=-1){ ... }竟然也过了！！！
请解释一下，OK？？？
谢谢了！
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