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MLE和TLE可能是这样造成的（见内）

Posted by fantasyorz at 2010-02-25 00:06:07 on Problem 1703 
ra = find( a );     // 求a的根节点
rb = find( b );     // 求b的根节点
if ( ra != rb )     // *
  unionSets( a, b, ra, rb );
如果不判断ra和rb，当ra == rb时： parent[ ra ] = rb;
1. 若你的find函数是用递归写的，将会导致无限递归==>MLE
2. 若你的find函数是用迭代写的，将会导致无限循环==>TLE
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