[leetcode 14] Longest Common Prefix
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Quesiton:
Write a function to find the longest common prefix string amongst an array of strings.
分析:
题目要求写一个函数,返回所有字符串的最常公共前缀。
如果只有一个字符串,返回本身即可;
若果字符串数量大于等于2,依次比较即可。先比较前两个,前缀的长度肯定小于等于这两个字符串的最小串长度,根据这两个字符串求出这两个字符串的公共前缀prefix;
然后求得prefix跟第三个字符串公共前缀,只比较第三个字符串的前prefix.size().个字符即可求得公共前缀,依次类推。
代码:
<span style="font-size:14px;">class Solution {public: string longestCommonPrefix(vector<string>& strs) { string result; string prefix; if(strs.empty()) return result; if(strs.size() == 1) return strs[0]; for(int i = 0; i < min(strs[0].size(),strs[1].size()); ++i){ if(strs[0][i] == strs[1][i]) prefix += strs[0][i]; else break; } for(int i = 2; i < strs.size(); ++i){ for(int j = 0; j < prefix.size(); ++j){ if(prefix[j] != strs[i][j]){ prefix.erase(j,prefix.size()-j); break; } } } return prefix; }};</span>
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