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problemsol.cpp
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#include<bits/stdc++.h>
using namespace std;
int main()
{
int n;
cin>>n;
while(n--)
{
string s;
cin>>s;
char a=s[0];
int counta=0;
int countb=0;
for(int i=0;i<s.length();++i)
{
if(s[i]==a)
{
s[i]='(';
counta++;
}
}
char b;
for(int i=0;i<s.length();++i)
{
if(s[i]!='(')
{
b=s[i];
break;
}
}
for(int i=0;i<s.length();++i)
{
if(s[i]==b)
{
s[i]=')';
countb++;
}
}
char c;
for(int i=0;i<s.length();++i)
{
if(s[i]!='(' && s[i]!=')')
{
if(counta-countb>0)
{
s[i]=')';
}
else
{
s[i]='(';
}
}
}
int x=0;
for(int i=0;i<s.length();++i)
{
if(s[i]=='(')
x++;
if(s[i]==')')
x--;
if(x<0)
break;
}
if(x==0)
cout<<"YES\n";
else
cout<<"NO\n";
}
}