This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
int n;
string s;
bool check(stack<char>st,int l)
{
for(int i=l;i<n;i++)
{
if(st.empty()||st.top()!=s[i])
{
st.push(s[i]);
}
else if(!st.empty()&&st.top()==s[i])
{
st.pop();
}
}
if(!st.empty())
{
return false;
}
return true;
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(0);
cin>>s;
n=s.size();
stack<char>st;
string res="";
for(int i=0;i<n;i++)
{
if(st.empty()||st.top()!=s[i])
{
res+='(';
st.push(s[i]);
}
else if(!st.empty()&&st.top()==s[i])
{
st.push(s[i]);
if(check(st,i+1))
{
res+='(';
}
else
{
st.pop();
st.pop();
res+=')';
}
}
}
if(!st.empty())
{
cout<<"-1";
return 0;
}
cout<<res;
return 0;
}
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