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Update 5.4.4链表的倒数第m个元素.md

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Original file line number	Diff line number	Diff line change
`@@ -25,7 +25,7 @@ int Find(forward_list<int>& linklist, int m){`
`25`	`25`	`forward_list<int>* ans;`
`26`	`26`	`int count = 1;// 将最后一个元素的位置记为1`
`27`	`27`
`28`		`- for(fast = linklist.before_begin(); fast != linklist.end() && count < m; fast++){`
	`28`	`+ for(; fast != linklist.end() && count < m; fast++){`
`29`	`29`	`count++;`
`30`	`30`	`}`
`31`	`31`
`@@ -52,5 +52,6 @@ int main(){`
`52`	`52`	`linklist.push_front(8);`
`53`	`53`	`linklist.push_front(9);`
`54`	`54`	`cout << Find(linklist, 2);`
	`55`	`+ return 0;`
`55`	`56`	`}`
`56`	`57`	```

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