>

LoeiJe

:D 获取中...

何以解忧?唯有暴富

最长公共前缀

将暴力进行到底!

vector判断是否为空: str.empty() 为空输出true,反之输出false。

删除string最后一个元素: pop_back();

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
// 最长公共前缀.cpp: 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <iostream>
#include <vector>
#include <string>
using namespace std;

class Solution {
public:
string longestCommonPrefix(vector<string>& strs) {
if (strs.empty()) return "";
string ans = strs[0];

if (strs.size() == 0 || strs.size() == 1) return "";
for (int i = 0; i < strs.size(); i++)
{
while (true)
{
int len1 = ans.size();
int len2 = strs[i].size();
//if (len1 == 0)
//return " ";
if (len1 == len2)
{
if (ans == strs[i]) break;
else
{
ans.pop_back();
strs[i].pop_back();
}
}
else if (len1 > len2)
{
ans.pop_back();
}
else
strs[i].pop_back();
}
}
return ans;
}
};

int main()
{
Solution s;
vector<string> strs;
strs.push_back("dog");
strs.push_back("aig");
strs.push_back("dar");
cout << s.longestCommonPrefix(strs) << endl;
return 0;
}