func_code_string: #include <bits/stdc++.h>   using namespace std;      const int N = 1e5 + 5;      struct query {    int i, type, l, r, k, p, x;   };      int n, m;   vector<int> a, _a;   query q[N];   int queryCnt;   int block_size;   int ans[N];   int freqA[N];   int freqL[N], freqR[N], freqV[N];      void increaseFreq(int f) {    freqR[f]++, freqL[f - 1]++, freqV[freqR[f] - 1] = f;   }      void decreaseFreq(int f) {    freqR[f]--, freqL[f - 1]--, freqV[freqR[f]] = f - 1;   }      void include(int i) {    increaseFreq(++freqA[a[i]]);   }      void remove(int i) {    decreaseFreq(freqA[a[i]]--);   }      void go(int& fromL, int& fromR, int toL, int toR) {    // debug() << name(fromL) name(fromR) name(toL) name(toR);    while (fromL > toL) include(--fromL);    while (fromR < toR) include(fromR++);    while (fromL < toL) remove(fromL++);    while (fromR > toR) remove(--fromR);   }      void update(int qi, int L, int R) {    if (L <= q[qi].p && q[qi].p < R) remove(q[qi].p);    a[q[qi].p] = q[qi].x;    if (L <= q[qi].p && q[qi].p < R) include(q[qi].p);   }      int answer(int k) {    vector<pair<int, int>> v;    for (int at = freqV[1]; at != 0; ) {     v.push_back({at, freqR[at] - freqL[at]});     at = freqV[freqR[at]];    }    reverse(v.begin(), v.end());        int ret = -1;    for (int l = 0, r = 0, cnt = 0; l < v.size(); cnt -= v[l++].second) {     r = max(l, r);     while (r < v.size() && cnt < k) cnt += v[r++].second;     if (cnt >= k) {      int _ret = v[r - 1].first - v[l].first;      ret = ret == -1 ? _ret : min(ret, _ret);     }    }       // debug() << name(k) name(v) name(ret);        return ret;   }      int main() {    scanf( %d %d , &n, &m);    _a.resize(n + 1);    for (int i = 1; i <= n; i++) scanf( %d , &_a[i]); a = _a;    for (int i = 1; i <= m; i++) {     q[i].i = i;     scanf( %d , &q[i].type);     if (q[i].type == 1) scanf( %d %d %d , &q[i].l, &q[i].r, &q[i].k);     else scanf( %d %d , &q[i].p, &q[i].x);     queryCnt += q[i].type == 1;    }        block_size = ceil(cbrt((long double)2 * n * n));        sort(q + 1, q + m + 1, [](const query& q1,const query& q2) {     int l1 = (q1.l - 1) / block_size, r1 = (q1.r - 1) / block_size;     int l2 = (q2.l - 1) / block_size, r2 = (q2.r - 1) / block_size;     auto p1 = make_pair(l1, r1);     auto p2 = make_pair(l2, r2);          if (q1.type == 1) {      if (q2.type == 1) return make_pair(p1, q1.i) < make_pair(p2, q2.i);      else return true;     } else {      if (q2.type == 1) return false;      else return q1.i < q2.i;     }    });        // for (int i = 1; i <= m; i++) debug() << name(i) name(q[i].type) name(q[i].i);        fill(ans, ans + N, -2);    fill(freqL, freqL + N, 1);    fill(freqR, freqR + N, 1);    freqR[0] = N;        pair<int, int> qp = {-1, -1};    int qAt;    int L = 1, R = 1;    for (int i = 1; i <= m && q[i].type == 1; i++) {     int ql = (q[i].l - 1) / block_size, qr = (q[i].r - 1) / block_size;     pair<int, int> _qp = {ql, qr};     if (qp != _qp) {      go(L, R, block_size * ql + 1, block_size * ql + 1);      a = _a;      qAt = queryCnt + 1;      qp = _qp;     }          while (qAt <= m && q[qAt].i < q[i].i) {      update(qAt, L, R);      qAt++;     }          go(L, R, q[i].l, q[i].r + 1);          // debug() << name(q[i].i);     ans[q[i].i] = answer(q[i].k);    }        for (int i = 1; i <= m; i++) if (ans[i] >= -1) printf( %d n , ans[i]);        return 0;   }