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C.cpp
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C.cpp
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// #pragma GCC optimize("Ofast,unroll-loops")
// #pragma GCC target("avx,avx2,fma")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned long long
#define dd double
#define ld long double
#define sl(n) scanf("%lld", &n)
#define si(n) scanf("%d", &n)
#define sd(n) scanf("%lf", &n)
#define pll pair <ll, ll>
#define pii pair <int, int>
#define mp make_pair
#define pb push_back
#define all(v) v.begin(), v.end()
#define inf (1LL << 61)
#define loop(i, start, stop, inc) for(ll i = start; i <= stop; i += inc)
#define for1(i, stop) for(ll i = 1; i <= stop; ++i)
#define for0(i, stop) for(ll i = 0; i < stop; ++i)
#define rep1(i, start) for(ll i = start; i >= 1; --i)
#define rep0(i, start) for(ll i = (start-1); i >= 0; --i)
#define ms(n, i) memset(n, i, sizeof(n))
#define casep(n) printf("Case %lld:", ++n)
#define pn printf("\n")
#define pf printf
#define EL '\n'
#define fastio std::ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
// === Debug macro starts here ===
#ifndef ONLINE_JUDGE
#define DEBUG
#define SYS_COL system("COLOR")
#endif
int recur_depth = 0;
#ifdef DEBUG
#define dbg(x) {++recur_depth; auto x_=x; --recur_depth; SYS_COL; \
cerr<<string(recur_depth, '\t')<<"\e[91m"<<__func__<<":" \
<<__LINE__<<"\t"<<#x<<" = "<<x_<<"\e[39m"<<endl;}
template<typename Ostream, typename Cont>
typename enable_if<is_same<Ostream,ostream>::value,
Ostream&>::type operator<<(Ostream& os, const Cont& v) {
os<<"[";
for(auto& x:v){os<<x<<", ";}
return os<<"]";
}
template<typename Ostream, typename ...Ts>
Ostream& operator<<(Ostream& os, const pair<Ts...>& p){
return os<<"{"<<p.first<<", "<<p.second<<"}";
}
#else
#define dbg(x)
#endif
// === Debug macro ends here ===
#define ff first
#define ss second
const ll sz = 1e3 + 10;
struct info {
string s;
int dep;
};
stack <info> st[sz];
int main()
{
fastio;
ll t;
cin >> t;
while(t--) {
st[0].push({"", 0});
ll n; cin >> n;
for1(i, n) {
ll x; cin>>x;
string now = to_string(x);
assert(!st[x-1].empty());
string got = st[x-1].top().s;
int dep = st[x-1].top().dep;
st[x-1].pop();
for(ll j = 0; j <= n; j++)
while(!st[j].empty() && st[j].top().dep >= dep)
st[j].pop();
while(!got.empty() && got.back() != '.')
got.pop_back();
for(char &ch : now) got.pb(ch);
cout << got << EL;
st[x].push({got, dep});
got.pb('.');
st[0].push({got, dep+1});
//dbg("l");
}
for(ll i = 0; i <= n; i++)
while(!st[i].empty())
st[i].pop();
}
return 0;
}