c++ - 找出最长的没有重复字符的子串

标签 c++ arrays string algorithm

我写了这个程序:

class Solution {
public:
    int lengthOfLongestSubstring(string s) {
        int i = 0, t_max = 0, max = 0;
        char arr[256];
        fill_n(arr, 256, -1);

        for (i = 0; i < s.length(); i++) {
            if (arr[(int)s[i]] != -1) {
                if (i != s.length() - 1){
                    t_max = t_max >= (i - arr[(int)s[i]]) ? i - arr[(int)s[i]] : ++t_max;
                    arr[(int)s[i]] = i;
                } else {
                    t_max = t_max >= (i - arr[(int)s[i]]) ? t_max : ++t_max; 
                }
            } else {
                arr[(int)s[i]] = i;
                t_max++;
            }
            max = max > t_max ? max : t_max;
        }
        return max;
    }
};

对于 leetcode

它通过了除此之外的所有测试用例:(如果您有任何想法,请告诉我):

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最佳答案

那个测试用例很长。很长。大约 20,000 个字符。您的算法依赖于将字符串索引存储在数组中,但您的数组定义为:

char arr[256];

那根本无法容纳那么大的值(value)。只需将其升级为:

int arr[256];

应该处理它。

也就是说,您的代码有问题。两行类似于:

t_max = t_max >= (i - arr[(int)s[i]]) ? t_max : ++t_max; 

是未定义的行为,因为相对于右侧的 ++t_max 的副作用,左侧的 t_max 的读取是无序的。参见 sequence points .这可以很容易地替换为 t_max + 1

此外,您所有的索引都是通过 arr[(int)s[i]] 完成的。你不需要那个 Actor 。只需 arr[s[i]] 即可。

关于c++ - 找出最长的没有重复字符的子串,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28486983/

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