func_code_string: #include <bits/stdc++.h>   using namespace std;   template <typename T>   T gcd(T x, T y) {     if (x < y) swap(x, y);     while (y > 0) {       T f = x % y;       x = y;       y = f;     }     return x;   }   const int maxn = 100007;   int BLOCKSIZE = 250;   set<int> s[maxn];   int a[maxn];   int nxt[maxn];   int prv[maxn];   int n, m;   long long b[maxn];   int d[maxn];   int lst[maxn];   long long query(int block, int R) {     int iBlockStart = block * BLOCKSIZE;     int iBlockEnd = min((block + 1) * BLOCKSIZE, n);     int idx = upper_bound(d + iBlockStart, d + iBlockEnd, R,                           [](int i, int j) { return i < nxt[j]; }) -               d;     if (idx == iBlockStart) return 0;     return b[idx - 1];   }   void updateBlock(int block) {     int iBlockStart = block * BLOCKSIZE;     int iBlockEnd = min((block + 1) * BLOCKSIZE, n);     sort(d + iBlockStart, d + iBlockEnd,          [](int i, int j) { return nxt[i] < nxt[j]; });     b[iBlockStart] = nxt[d[iBlockStart]] - d[iBlockStart];     for (int i = iBlockStart + 1; i < iBlockEnd; i++)       b[i] = b[i - 1] + nxt[d[i]] - d[i];   }   int main(int argc, char *argv[]) {     std::cin.sync_with_stdio(false);     std::cin.tie(nullptr);     cin >> n >> m;     {       for (int i = 0; i < n; i++) nxt[i] = n, prv[i] = -1, d[i] = i;       memset(lst, -1, sizeof(lst));       for (int i = 0; i < n; i++) {         cin >> a[i];         int pr = lst[a[i]];         if (pr != -1) {           nxt[pr] = i;           prv[i] = pr;         }         lst[a[i]] = i;         s[a[i]].insert(i);       }       for (int i = 0; i * BLOCKSIZE < n; i++) updateBlock(i);       for (int i = 0; i < m; i++) {         int op;         cin >> op;         if (op == 1) {           int p, x;           cin >> p >> x;           p--;           if (a[p] == x) continue;           if (nxt[p] != n) prv[nxt[p]] = prv[p];           if (prv[p] != -1) {             nxt[prv[p]] = nxt[p];             if (prv[p] / BLOCKSIZE != p / BLOCKSIZE)               updateBlock(prv[p] / BLOCKSIZE);           }           s[a[p]].erase(p);           a[p] = x;           nxt[p] = n;           prv[p] = -1;           auto it = s[x].emplace(p).first;           bool updatedNext = false;           if (it != s[x].begin()) {             int pr = *prev(it);             int nx = nxt[pr];             nxt[pr] = p;             prv[p] = pr;             if (pr / BLOCKSIZE != p / BLOCKSIZE) updateBlock(pr / BLOCKSIZE);             if (nx != n) {               prv[nx] = p;               nxt[p] = nx;               updatedNext = true;             }           }           if (!updatedNext) {             auto nxiter = next(it);             if (nxiter != s[x].end()) {               int nx = *nxiter;               prv[nx] = p;               nxt[p] = nx;             }           }           updateBlock(p / BLOCKSIZE);         } else {           int l, r, R;           cin >> l >> r;           l--;           r--;           R = r;           long long res = 0;           for (; l <= r && l % BLOCKSIZE; l++)             if (nxt[l] <= R) res += nxt[l] - l;           for (; l <= r && (r + 1) % BLOCKSIZE; r--)             if (nxt[r] <= R) res += nxt[r] - r;           if (l <= r) {             for (int i = l / BLOCKSIZE, j = r / BLOCKSIZE; i <= j; i++) {               res += query(i, R);             }           }           cout << res << endl;         }       }     }     return 0;   }   