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BT的地方，大家注意了

Posted by 200593141 at 2008-03-03 17:44:30 on Problem 2108 
	 if(cant > total || pos-1>total - cant)
	 {
	    printf("It cannot be solved.\n");
		continue;
	 }
         只有pos-1>total - cant是不够的，这是贡献了4个WA的结论
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