#include <bits/stdc++.h>
using namespace std;

#define rep(i,buckets,y) for(int i=(buckets);i<(y);++i)
#define debug(buckets) #buckets << "=" << (buckets)

#ifdef DEBUG
#define _GLIBCbucketsbuckets_DEBUG
#define print(buckets) std::cerr << debug(buckets) << " (L:" << __LINE__ << ")" << std::endl
#else
#define print(buckets)
#endif

const int inf=1e9;
const int64_t inf64=1e18;
const double eps=1e-9;

template <typename T> ostream &operator<<(ostream &os, const vector<T> &vec){
    os << "[";
    for (const auto &v : vec) {
    	os << v << ",";
    }
    os << "]";
    return os;
}

using i64=int64_t;

struct sqrt_decomp{
    const int bucket_size=96;
    int length,bucket_num;
    vector<vector<int>> buckets;
    vector<int> update,bucket_sum;
    sqrt_decomp(const vector<int> &x):length(x.size()),bucket_num((x.size()+bucket_size-1)/bucket_size){
        buckets.resize(bucket_num);
        update.resize(bucket_num);
        bucket_sum.resize(bucket_num);
        for(int i=0; i<x.size(); ++i){
            buckets[i/bucket_size].push_back(x[i]);
            bucket_sum[i/bucket_size]+=x[i];
            update[i/bucket_size]=2;
        }
    }
    int sum(){
        int res=0;
        for(int i=0; i<bucket_num; ++i){
            if(update[i]==2) res+=bucket_sum[i];
            else res+=update[i]*buckets[i].size();
        }
        return res;
    }
    void query(int l,int r,int b){ //[l,r]
        l=max(0,l);
        r=min(length-1,r);
        while (l % bucket_size != 0 && l<=r) {
            int bucket_index = l/bucket_size;
            if (update[bucket_index] < 2) {
                for (auto &a : buckets[bucket_index]) a = update[bucket_index];
                bucket_sum[bucket_index]=update[bucket_index]*buckets[bucket_index].size();
                update[bucket_index] = 2;
            }
            bucket_sum[bucket_index]-=buckets[bucket_index][l%bucket_size];
            buckets[bucket_index][l%bucket_size] = b;
            bucket_sum[bucket_index]+=b;
            ++l;
        }
        while((r+1)%bucket_size!=0 and l<=r){
            int bucket_index=r/bucket_size;
            if(update[bucket_index]<2){
                for(auto &a:buckets[bucket_index]) a=update[bucket_index];
                bucket_sum[bucket_index]=update[bucket_index]*buckets[bucket_index].size();
                update[bucket_index]=2;
            }
            bucket_sum[bucket_index]-=buckets[bucket_index][r%bucket_size];
            buckets[bucket_index][r%bucket_size]=b;
            bucket_sum[bucket_index]+=b;
            --r;
        }
        if(l>r) return;
        rep(i,l/bucket_size,r/bucket_size+1) update[i]=b;
    }
    int at(int i){
        int bucket_index=i/bucket_size;
        if(update[bucket_index]<2) return update[bucket_index];
        else return buckets[bucket_index][i%bucket_size];
    }
};

void solve(){
    int n, q;
    string s;

    cin >> n >> s >> q;
    vector<int> x1,x2;
    rep(i,0,n){
        x1.push_back(s[i]-'0');
        if(i+1<n) x2.push_back((s[i]-'0')*(s[i+1]-'0'));
    }

    sqrt_decomp f(x1),g(x2);
    for (int i = 0; i < q; i++) {
        int l, r, b;
        cin >> l >> r >> b; 
        l--;
        r--;
        f.query(l,r,b);
        if(b==0) g.query(l-1,r,0);
        else{
            int l_=l,r_=r-1;
            if(0<=l-1 and f.at(l-1)) --l_;
            if(r+1<n and f.at(r+1)) ++r_;
            g.query(l_,r_,1);
        }
        cout << f.sum()-g.sum() << endl;
    }
}

int main(){
    std::cin.tie(0);
    std::ios::sync_with_stdio(false);
    cout.setf(ios::fixed);
    cout.precision(10);
    solve();
    return 0;
}

Measured memory_bytes: 4924