ДО Е OK

#include <iostream>
#include <cmath>
#include <vector>
#include <queue>
#include <algorithm>
#include <string>
#include <stack>
#include <set>
#include <map>
#define pii pair <int,int>
#define vec vector
using namespace std;
using ll = long long;
using ld = long double;
using db = double;
void cv(vector <int> &v){
    for (auto x: v) cout<<x<<' ';
    cout<<"\n";
}

void cvl(vector <ll> &v){
    for (auto x: v) cout<<x<<' ';
    cout<<"\n";
}


void cvv(vector <vector <int> > &v){
    for (auto x: v) cv(x);
    cout<<"\n";
}

void cvb(vector <bool> v){
    for (bool x: v) cout<<x<<' ';
    cout<<"\n";
}

void cvs(vector <string>  v){
    for (auto a: v){
        cout<<a<<"\n";
    }
}

int N,L,R,ans,cnt,k;

bool fnd; //found k-й zero

struct tree{
    vector <int> Z;

    void bld(){
        cin>>N;
        int rawN=N;
        N = pow(2, ceil(log2(N)) ) ;
        //cout<<"N= "<<N<<"\n";
        Z.assign(2*N-1,0);
        for (int i = N-1; i < N-1 + rawN;++i){
            int d; cin>>d;
            if (d == 0) Z[i]=1;
        }
        for (int i = N-2; i >=0;--i) Z[i] = Z[2*i+1] + Z[2*i+2];
        //cv(Z);
    }

    void sh(){
        int t = log2(N);
        int id=-1;
        for (int i=0;i<=t;++i){
            for (int j=0;j<pow(2,i);++j){
                id++; cout<<Z[id]<<" ";
            }cout<<"\n";
        }
    }

    void getZ(int l, int r, int id){
        int m;
        //cout<<"l r = "<<l<<' '<<r<<"\n";
        //cout<<"id = "<<id<<"\n";
        //+раасмотреть 3 случая пересечения
        if (l > R || r < L){
            //cout<<"A\n";
            return;
        }
        else if (l >= L && r <= R){
            //cout<<"cnt Z[id] k = "<<cnt<<' '<<Z[id]<<' '<<k<<"\n";
            if (cnt == k-1 && l == r && Z[id] == 1){
                //cout<<"BINGO\n";
                ans = id - (N-2);
                fnd=1;
                return;
            }
            else if (cnt + Z[id] < k){
                //cout<<"C\n";
                cnt += Z[id];
                return;
            }
            else{
                //cout<<"D\n";
                m = (l+r)/2;
                getZ(l,m, 2*id+1);
                if (fnd) return;
                getZ(m+1,r, 2*id+2);
            }
        }

        else{
            //cout<<"E\n";
            m = (l+r)/2;
            getZ(l,m, 2*id+1);
            if (fnd) return;
            getZ(m+1,r, 2*id+2);
        }
    }

    void chg(int id, int nw){//new
        id = N - 2 + id;
        //если ничего не поменялось
        if (nw == 0 && Z[id] == 1){
            return;
        }
        if (nw != 0 && Z[id] == 0){
            return;
        }
        //если поменялось
        if (nw == 0){
            Z[id] = 1;
        }
        else Z[id] = 0;
        while (id > 0 ){
            id = (id-1)/2;
            Z[id] = Z[id*2+1] + Z[id*2+2];
        }
    }
};


int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    tree T;
    T.bld();
    //T.sh();
    int M; cin>>M;
    for (int i = 0; i <M;++i){
        char cmd; cin>>cmd;
        if (cmd == 's'){
            cin>>L>>R>>k;
            L--; R--;
            ans=-1;
            fnd=0;
            cnt=0;
            T.getZ(0,N-1,0);
            cout<<ans<<' ';
        }
        else{
            int id,nw;//new
            cin>>id>>nw;
            //id--;
            T.chg(id, nw);
            //T.sh();
        }

    }
}