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C/C++ code:

#include <iostream>
#include <string>

using namespace std;

bool getmaxsubstr(const string& s, string& oks);

int main()
{
string str;

while (cin >> str)
{
string s;
if (getmaxsubstr(str, s))
{
cout << s << endl;
}
else
{
cout << "do not exist!\n";
}
}

return 0;
}

bool getmaxsubstr(const string& s, string& oks)
{
string rets;
int len = 0;
bool bf = false;
for (int i = 0; i < s.size(); ++i)
{
for (int j = 1; j <= s.size() - i; ++j)
{
rets = s.substr(i, j);
if (s.find(rets, i + j) != string::npos && rets.size() > len)
{
len = rets.size();
oks = rets;
bf = true;
}
}
}

return bf;
}


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#include <stdio.h>

#define BUF_MAX 1000


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extern "C"ÎÊÌâ

/*-----------c.h--------------*/
#ifndef _C_H_
#define _C_H_
extern "C" int add(int x, int y);
#endif

/*-----------c.c--------------*/
int add(int x, int y){
return ......
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