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CF1950E.cpp
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#include <bits/extc++.h>
using namespace std;
namespace pbds = __gnu_pbds;
using ui = unsigned int;
using uli = unsigned long long int;
using li = long long int;
template <typename IT> size_t check_neq(IT beg1, IT end1, IT beg2) {
size_t ans = 0;
for (; beg1 != end1; ++beg1, ++beg2)
if (*beg1 != *beg2) ++ans;
return ans;
}
int main(void) {
ios::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
size_t T;
cin >> T;
while (T--) {
size_t n;
string s;
cin >> n >> s;
for (size_t i = 1; i <= n / 3; ++i)
if (n % i == 0) {
int flag = 0;
bool t = 0;
for (string::iterator ht = s.begin(), it = ht + i, jt = it + i;
jt < s.end(); ht += i, it += i, jt += i) {
size_t x = check_neq(ht, it, it), y = check_neq(it, jt, jt);
if (x == 0 && y == 0)
;
else if (x > 1 || y > 1)
goto failed;
else if (x == 1 && y == 1) {
if (t || !equal(ht, it, jt))
goto failed;
else
t = true;
} else if (flag == 2)
goto failed;
else if (x == 1) {
if (flag == 0)
flag = -1;
else if (flag == -1)
goto failed;
else
flag = 2;
} else if (y == 1) {
if (flag == 0)
flag = 1;
else if (flag == 1)
goto failed;
else
flag = 2;
}
}
{
string::iterator ht = s.end() - i - i, it = ht + i, jt = s.begin();
size_t x = check_neq(ht, it, it), y = check_neq(it, s.end(), jt);
if (x == 0 && y == 0)
;
else if (x > 1 || y > 1)
goto failed;
else if (x == 1 && y == 1) {
if (t || !equal(ht, it, jt))
goto failed;
else
t = true;
} else if (flag == 2)
goto failed;
else if (x == 1) {
if (flag == 0)
flag = -1;
else if (flag == -1)
goto failed;
else
flag = 2;
} else if (y == 1) {
if (flag == 0)
flag = 1;
else if (flag == 1)
goto failed;
else
flag = 2;
}
}
{
string::iterator ht = s.end() - i, it = s.begin(), jt = it + i;
size_t x = check_neq(ht, s.end(), it), y = check_neq(it, jt, jt);
if (x == 0 && y == 0)
;
else if (x > 1 || y > 1)
goto failed;
else if (x == 1 && y == 1) {
if (t || !equal(ht, s.end(), jt))
goto failed;
else
t = true;
} else if (flag == 2)
goto failed;
else if (x == 1) {
if (flag == 0)
flag = -1;
else if (flag == -1)
goto failed;
else
flag = 2;
} else if (y == 1) {
if (flag == 0)
flag = 1;
else if (flag == 1)
goto failed;
else
flag = 2;
}
}
cout << i << '\n';
goto successful;
failed:;
}
if (n % 2 == 0 && check_neq(s.begin(), s.begin() + s.size() / 2,
s.begin() + s.size() / 2) <= 1)
cout << n / 2 << '\n';
else
cout << n << '\n';
successful:;
}
return 0;
}