## ➤ Problem Link : 1342B. Binary Period

## ✅ C++ Solution :

#include<bits/stdc++.h> using namespace std; #define ll long long int #define pb push_back #define mp make_pair int main() { int t; cin>>t; while(t--) { string s; cin>>s; bool f=1; for(int i=1;i<s.length();i++) if(s[i]!=s[i-1]) { f=0; break; } if(f) { cout<<s<<"\n"; continue; } int n=s.length(); string ans=""; ans+=s[0]; int i=1; while(i<n) { if(s[i]!=s[i-1]) ans+=s[i++]; else { if(s[i]=='0') ans+="1"; else ans+="0"; ans+=s[i++]; } } cout<<ans<<"\n"; } }

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