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Hi, why this gives Time Limit Exceeded?

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

void mySwap (char &a, char &b)
{
char tmp = a;
a = b;
b = tmp;

}

class Permuter
{

public:
Permuter ()
{
this->word_ = "";

}

void setWord (const std::string &word ...