func_code_string: #include <bits/stdc++.h>   using namespace std;   using ll = long long;   const int N = 2e5 + 10;   int beg[N];   int nxt[N];   int to[N];   int tot;   int a[N];   void add(int x, int y) {     ++tot;     nxt[tot] = beg[x];     to[tot] = y;     beg[x] = tot;   }   int main() {     ios::sync_with_stdio(false);     cin.tie(nullptr);     int n, m, k;     cin >> n >> m >> k;     for (int i = 1; i <= n; ++i) {       int x;       cin >> x;       add(x, i);     }     int ans = 0;     for (int i = 1; i <= m; ++i) {       int siz = 0;       for (int j = beg[i]; j; j = nxt[j]) a[++siz] = to[j];       if (siz == 0) continue;       reverse(a + 1, a + 1 + siz);       for (int r = 1, l = 1; r <= siz; ++r) {         for (; l < r && a[r] - a[l] + 1 > k + r - l + 1; ++l)           ;         ans = max(ans, r - l + 1);       }     }     cout << ans;   }   