func_code_string: #include <bits/stdc++.h>   using namespace std;   int n;   int a[300005] = {0};   int c1 = 0, c2 = 0, p1 = 0, p2 = 0;   int main() {     cin >> n;     for (int i = 1; i <= n; i++) cin >> a[i];     int maxn = -1;     for (int i = 1; i <= n; i++) {       if (c1 == 0) {         p1 = i;         c1 = a[i];       } else if (c2 == 0 && a[i] != c1) {         p2 = i;         c2 = a[i];         maxn = max(maxn, p2 - p1);       } else if (a[i] == c1 && p2 != 0) {         maxn = max(maxn, i - p2);       } else if (a[i] == c2) {         maxn = max(maxn, i - p1);       } else if (a[i] != c1 && a[i] != c2) {         maxn = max(maxn, i - p1);       }     }     cout << maxn << endl;     return 0;   }   