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 = 350;   set<int> s[maxn];   int a[maxn];   int nxt[maxn];   int n, m;   long long b[maxn];   int d[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;     {       BLOCKSIZE = 1;       while (BLOCKSIZE * BLOCKSIZE < n) BLOCKSIZE++;       BLOCKSIZE = max(BLOCKSIZE, 10);       for (int i = 0; i < n; i++) nxt[i] = n + 1, d[i] = i;       for (int i = 0; i < n; i++) {         cin >> a[i];         if (!s[a[i]].empty()) nxt[*s[a[i]].rbegin()] = 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;           {             auto it = s[a[p]].find(p);             if (it != s[a[p]].begin()) {               int pr = *prev(it);               auto nxt_it = it == s[a[p]].end() ? it : next(it);               nxt[pr] = nxt_it == s[a[p]].end() ? (n + 1) : *nxt_it;               updateBlock(pr / BLOCKSIZE);             }           }           s[a[p]].erase(p);           a[p] = x;           nxt[p] = n + 1;           if (!s[x].empty()) {             auto it = s[x].upper_bound(p);             if (it != s[x].begin()) {               int pr = *prev(it);               nxt[pr] = p;               updateBlock(pr / BLOCKSIZE);             }             if (it != s[x].end()) {               nxt[p] = (it == s[x].end()) ? (n + 1) : *it;             }           }           s[a[p]].insert(p);           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;   }   