POJ 1016 模拟题

题目连接：http://poj.org/problem?id=1016

题目没什么好说的，就是模拟，可以用string来简化代码。

代码：

Source Code

Problem: 1016		User: bingshen
Memory: 236K		Time: 141MS
Language: C++		Result: Accepted

• Source Code

  #include<iostream>
  #include<string>
  
  using namespace std;
  
  string str[20];
  
  void dfs(string input,int index)
  {
  	int i,num[10]={0};
  	string temp;
  	if(index==16)
  		return;
  	for(i=0;i<input.length();i++)
  		num[input[i]-'0']++;
  	for(i=0;i<10;i++)
  	{
  		if(num[i])
  		{
  			if(num[i]<10)
  				temp.insert(temp.end(),num[i]+'0');
  			else
  			{
  				temp.insert(temp.end(),num[i]/10+'0');
  				temp.insert(temp.end(),num[i]%10+'0');
  			}
  			temp.insert(temp.end(),i+'0');
  		}
  	}
  	str[index]=temp;
  	dfs(temp,index+1);
  }
  
  int findloop(int index)
  {
  	int i;
  	for(i=index+1;i<=15;i++)
  		if(str[i]==str[index])
  			return (i-index);
  	return 0;
  }
  
  int main()
  {
  	int loop,i;
  	bool flag,after;
  	string input;
  	while(cin>>input)
  	{
  		if(input=="-1")
  			break;
  		str[0]=input;
  		after=true;
  		dfs(input,1);
  		if(str[0]==str[1])
  		{
  			cout<<str[0]<<" is self-inventorying"<<endl;
  			continue;
  		}
  		for(i=1;i<=15;i++)
  		{
  			if(str[i-1]==str[i])
  			{
  				after=false;
  				cout<<str[0]<<" is self-inventorying after "<<i-1<<" steps"<<endl; 
  				break;
  			}
  		}
  		if(after)
  		{
  			flag=true;
  			for(i=0;i<=15;i++)
  			{
  				loop=findloop(i);
  				if(loop)
  				{
  					flag=false;
  					cout<<str[0]<<" enters an inventory loop of length "<<loop<< endl; 
  					break;
  				}
  			}
  			if(flag)
  				cout<<str[0]<<" can not be classified after 15 iterations"<<endl;  
  		}
  	}
  	return 0;
  }