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这里就保证了吧？

Posted by TN at 2005-05-27 15:39:25 on Problem 2085
In Reply To:能阿 Posted by:TN at 2005-05-27 15:38:56 
            ans[i]=max(1,m-(n-i)*(n-i-1)/2+1);
            m-=ans[i]-1;
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