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1789B.cpp
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1789B.cpp
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#include <bits/stdc++.h>
using namespace std;
#define pii pair<int, int>
#define vt vector
#define ll long long
#define pb push_back
#define ioa insert_or_assign
#define umap unordered_map
#define prq priority_queue
#define F first
#define S second
#define all(c) (c).begin(), (c).end()
#define rev(c) (c).rbegin(), (c).rend()
#define sz(x) (int)((x).size())
#define mset(ar, val) memset(ar, val, sizeof(ar))
#define en '\n'
const int d4r[4] = {-1,0,1,0}; const int d4c[4] = {0,1,0,-1};
const int d8r[8] = {-1,-1,0,1,1,1,0,-1}; const int d8c[8] = {0,1,1,1,0,-1,-1,-1};
const int INF = 0x3f3f3f3f; const int mINF = 0xc0c0c0c0;
const ll LINF = 0x3f3f3f3f3f3f3f3f; const ll mLINF = 0xc0c0c0c0c0c0c0c0;
int T = 1;
int gcd(int a, int b) { return b == 0 ? a : gcd(b,a%b); }
void sol() {
int n;
cin >> n;
string s;
cin >> s;
int l = 0, r = sz(s)-1;
int cnt = 0;
bool diff = 0;
while(l<r) {
if(s[l] != s[r]) {
if(!diff) {
cnt++;
} else {
cout << "No" << en;
return;
}
} else {
if(cnt) {
diff = 1;
}
}
l++;
r--;
}
cout << "Yes" << en;
return;
}
int main() {
ios_base::sync_with_stdio(0); cin.tie(0);
cin >> T;
while(T--) {
sol();
}
return 0;
}