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#pragma GCC optimize("O2,no-stack-protector,unroll-loops") #define ll long long #define pb push_back #define ipar(arr, n) vector<ll> arr(n); for(int i=0;i<n;i++) cin>>arr[i]; #include <cmath> #include <bits/stdc++.h> #define pii pair<int, int>; #define pll pair<ll, ll>; using namespace std; void solve(){ ll n;cin>>n; vector<vector<char>> arr(n); for(int i=0;i<n;i++){ string s;cin>>s; vector<char>g(s.begin(),s.end()); arr[i]=g; } vector<char>res(n); ll ind=0; for(int i=0;i<n;i++){ if(arr[i][ind]=='0') res[i]='1'; else res[i]='0'; ind++; } string re(res.begin(),res.end()); cout<<re<<"\n"; } signed main() { ios_base::sync_with_stdio(0); cin.tie(0);cout.tie(0); int t; cin>>t; while(t--) solve(); }
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