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- #include <bits/stdc++.h>
- using namespace std;
- #define ll long long
- #define _test int _TEST; cin>>_TEST; while(_TEST--)
- #define pb push_back
- #define ppb pop_back
- #define pf push_front
- #define ppf pop_front
- int main()
- {
- _test
- {
- int n;
- string s;
- cin>>n>>s;
- int ans = 1;
- vector<int> flip(n);
- for(int k=2; k<=n; k++)
- {
- fill(flip.begin(), flip.end(), 0);
- int f = 0;
- for(int i=0; i<=n-k; i++)
- {
- if((f+(s[i]-'0'))%2 == 0)
- {
- f ^= 1;
- flip[i+k-1] = 1;
- }
- f ^= flip[i];
- }
- int chk = 1;
- for(int i=n-k+1; i<n; i++)
- {
- chk &= ((f+(s[i]-'0'))%2 == 1);
- f ^= flip[i];
- }
- if(chk) ans = k;
- }
- cout<<ans<<"\n";
- }
- }
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