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第三题不解,关于p指针 #167

@cnkeeper

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@cnkeeper

原文
你有提到为了防止p指针回溯,不太清除这是为什么。)

if(map.containsKey(chars[q])){
 p=map.get(chars[q])+1;
}
map.put(chars[q],q);
max=Math.max(max,q-p+1);

这样有什么问题吗,求解!

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