298D.cpp

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using str = string;
using pint = pair<int, int>;
using pll = pair<ll, ll>;
template<class T>using vc = vector<T>;
template<class T>using vvc = vc<vc<T>>;
using vint = vc<int>;
using vll = vc<ll>;
using vstr = vc<str>;
using vpint = vc<pint>;
using vpll = vc<pll>;
using vbool = vc<bool>;
using vvint = vvc<int>;
using vvll = vvc<ll>;

#define overload4(_1, _2, _3, _4, name, ...) name
#define rep1(n)          for(ll i = 0; i < (n); ++i)
#define rep2(i, n)       for(ll i = 0; i < (n); ++i)
#define rep3(i, a, b)    for(ll i = (a); i < (b); ++i)
#define rep4(i, a, b, c) for(ll i = (a); i < (b); i += (c))
#define rep(...) overload4(__VA_ARGS__, rep4, rep3, rep2, rep1)(__VA_ARGS__)
#define each1(a)       for(auto&& i : a)
#define each2(i,a)     for(auto&& i : a)
#define each3(x,y,a)   for(auto&& [x, y] : a)
#define each4(x,y,z,a) for(auto&& [x, y, z] : a)
#define each(...) overload4(__VA_ARGS__, each4, each3, each2, each1)(__VA_ARGS__)
#define all(x) (x).begin(), (x).end()

void yesno(bool flag){cout << (flag ? "Yes" : "No") << endl;}

int main() {
    ll mod = 998244353;
    ll Q; cin >> Q;
    vll amari(6*1e6);
    amari[0] = 1;
    rep(i,1,6*1e6){
        amari[i] = (10*amari[i-1])%mod;
    }
    queue<ll> q;
    ll ans = 1;
    q.push(1);
    rep(Q){
        ll x; cin >> x;
        if(x == 1){
            cin >> x;
            q.push(x);
            ans *= 10;
            ans += x;
            ans %= mod;
        }else if(x == 2){
            x = q.front();
            q.pop();
            ans -= (amari[q.size()]*x);
            ans %= mod;
            if(ans < 0) ans += mod;
        }else{
            cout << ans << endl;
        }
    }
}