#include<bits/stdc++.h>
using namespace std;
int main()
{
string str;
int len,cnt=0,coun=0,temp;
cin>>len;
cin>>str;
for(int i=0;i<str.size();i++)
{
if(str[i]=='0')
cnt++;
else
coun++;
}
temp=min(cnt,coun);
cout<<len-(temp*2)<<endl;
return 0;
}
556A Case of the Zeros and Ones.txt
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