new, C++ (vc++) - rextester

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//Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x86

#include <iostream>
#include <string>
#include<vector>
using namespace std;
int main()
{
  string  value="<?xml version=""1.0"" encoding=""UTF-8""?><note><to>Tove</to><from>Jani</from><heading>Reminder</heading><note/><body>Don't forget me this weekend!</body></note>";
vector<string> list;
    string w1;
    string a;
    int p1;
	int y = 0,z=0;
	int length = value.length();
	string value1 = "";
	for (int i = 0; i < length; i++)
	{
		if ((value[i] == '<'))
		{
			for (int y = i; y<length; y++)
			{
				if (value[y] == '>')
				{
					value1 = value1 + value[y];
					list.push_back(value1);
					break;
				}
                
value1 = value1 + value[y];
            }
        }
        if ((value[i] == '>'))
		{
			for (int z = i+1; z<length; z++)
			{
                
				if (value[z] == '<')
				{
					//value1 = value1 + value[z];
        
					list.push_back(value1);
					break;
				}
                //value1 = "";
				value1 = value1 + value[z];
			}
		}

value1 = "";

}
	int u = list.size();
	for (int o = 0; o<u; o++)
	{
      
        if(list.at(o)[0]=='<'&&list.at(o)[1]!='?')
        {
            
            int r=list.at(o).length();
            for(int u=0;u<r;u++)
            {
                if(list.at(o)[u]=='<')//||list.at(o)[u]=='>')//||list.at(o)[u]=='/')
                {
                    list.at(o).erase(u,1);
                }
                if(list.at(o)[u]=='/')//||list.at(o)[u]=='>')//||list.at(o)[u]=='/')
                {
                    list.at(o).erase(u,1);
                }
                if(list.at(o)[u]=='>')//||list.at(o)[u]=='>')//||list.at(o)[u]=='/')
                {
                    list.at(o).erase(u,1);
                }
                
            }
            
        }
         if(list.at(o)[0]=='<'&&list.at(o)[1]=='?')
        {
            
            int r=list.at(o).length();
            for(int u=0;u<r;u++)
            {
                if(list.at(o)[u]=='<')//||list.at(o)[u]=='>')//||list.at(o)[u]=='/')
                {
                    list.at(o).erase(u,1);
                }
                 
                 if(list.at(o)[u]=='?')//||list.at(o)[u]=='>')//||list.at(o)[u]=='/')
                {
                    list.at(o).erase(u,1);
                }
                if(list.at(o)[u]=='>')//||list.at(o)[u]=='>')//||list.at(o)[u]=='/')
                {
                    list.at(o).erase(u,1);
                }
            }
     
	}
         cout<<list.at(o)<<endl;
    }
    
    return 0;
}

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Compilation time: 1,75 sec, absolute running time: 0,21 sec, absolute service time: 1,98 sec