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#include <iostream>

#include <string.h>

using namespace std;

class University

{

public:

University(string t, string l)

{

tower_ = t;

lake_ = l;

}

static string & getLib()

{

return lib_;

}

// static string lib_;

void dis()

{

cout<<"tower:"<<"lake:"<<"graph:"<<lib_<<endl;

}

private:

string tower_;

string lake_;

static string lib_;

};

string University::lib_ = "";

int main()

{

University pk("pkTower","pkLake");

University tamu("towerTamu", "tamuLake");

University::getLib() += "ni";

pk.dis();

University::getLib() += "ni";

pk.dis();

return 0;

}