func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MX = 300005;   int n, c[MX];   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cin >> n;     for (int i = 0; i < n; i++) cin >> c[i];     int res = 0, i = n - 1;     while (c[0] == c[i]) i--;     res = i;     i = 0;     while (c[i] == c[n - 1]) i++;     res = max(res, n - i - 1);     cout << res <<   n ;     return 0;   }   