func_code_string: //  zukonit14 - Kunal Raut      #include<bits/stdc++.h>   using namespace std;      // #include  ext/pb_ds/assoc_container.hpp    // #include  ext/pb_ds/tree_policy.hpp    // using namespace __gnu_pbds;      // template<class T>   // using oset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update> ;      // template<class key, class value, class cmp = std::less<key>>   // using omap = tree<key, value, cmp, rb_tree_tag, tree_order_statistics_node_update>;   // find_by_order(k)  returns iterator to kth element starting from 0;   // order_of_key(k) returns count of elements strictly smaller than k;      /*/-----------------------------DEFINES----------------------------------/*/      #define ll                  long long   #define ld                  long double   #define pb                  push_back   #define mp                  make_pair   #define fi                  first   #define se                  second   #define pi                  3.1415926535   #define all(v)              v.begin(), v.end()   #define allr(v)             v.rbegin(), v.rend()   #define ms(s, n)            memset(s, n, sizeof(s))   #define prec(n)             fixed<<setprecision(n)   #define forci(p,n)          for(ll i=p;i<(ll)n;i++)   #define forcj(p,n)          for(ll j=p;j<(ll)n;j++)   #define forc(i,p,n)            for(ll i=p;i<(ll)n;i++)   #define bolt                ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);   #define bits(a)             __builtin_popcountll(a)   #define djokovic            freopen( input00.txt ,  r , stdin);freopen( output00.txt ,  w , stdout);   #define inrange(i,a,b)      ((i>=min(a,b)) && (i<=max(a,b)))   #define sz(a)               (ll)a.size()   #define sum(a)              ( accumulate ((a).begin(), (a).end(), 0ll))   #define mine(a)             (*min_element((a).begin(), (a).end()))   #define maxe(a)             (*max_element((a).begin(), (a).end()))   #define mini(a)             ( min_element((a).begin(), (a).end()) - (a).begin())   #define maxi(a)             ( max_element((a).begin(), (a).end()) - (a).begin())   #define lowb(a, x)          ( lower_bound((a).begin(), (a).end(), (x)) - (a).begin())   #define uppb(a, x)          ( upper_bound((a).begin(), (a).end(), (x)) - (a).begin())   clock_t time_p              = clock();   void rtime()                {time_p = clock() - time_p; cout <<   nTime Taken :   << fixed << (float)(time_p) / CLOCKS_PER_SEC <<  s n ;}         /*/-----------------------------INLINE FUNCTIONS----------------------------------/*/      inline ll gcd(ll a, ll b)          {if (b == 0) return a;    return gcd(b, a % b);}   inline ll lcm(ll a, ll b)          {return (a / gcd(a, b) * b);}   inline bool isprime(ll n)            {ll i; for (i = 2; i <= sqrt(n); i++) {if (n % i == 0)return false;} return true;}   inline ll ceil(ll num, ll den)      {return ((num + den - 1) / den);}      /*/-----------------------------TRACE FUNCTIONS----------------------------------/*/      template<class T> ostream& operator<<(ostream &os, string V) {       os <<  [  ;       for (auto v : V) os << v <<    ;       return os <<  ] ;   }   template<class T> ostream& operator<<(ostream &os, vector<T> V) {       os <<  [  ;       for (auto v : V) os << v <<    ;       return os <<  ] ;   }   template<class T> ostream& operator<<(ostream &os, set<T> S) {       os <<  {  ;       for (auto s : S) os << s <<    ;       return os <<  } ;   }   template<class T> ostream& operator<<(ostream &os, multiset<T> S) {       os <<  {  ;       for (auto s : S) os << s <<    ;       return os <<  } ;   }   template<class T, class T1> ostream& operator<<(ostream &os, map<T, T1> S) {       os <<  {  ;       for (auto s : S) os <<  (  << s.first <<  ,  << s.second <<  )  ;       return os <<  } ;   }   template<class L, class R> ostream& operator<<(ostream &os, pair<L, R> P) {       return os <<  (  << P.first <<  ,  << P.second <<  ) ;   }   #define tracearr(a,n)  {cout << #a<<  :  ;cout<< [  ;for (ll i = 0; i < n; i++) cout << a[i] <<    ;cout <<  ] n ;}   #define TRACE   #ifdef TRACE   #define trace(...) __f(#__VA_ARGS__, __VA_ARGS__)   template <typename Arg1>   void __f(const char* name, Arg1&& arg1) {       cout << name <<   :   << arg1 << endl;   }   template <typename Arg1, typename... Args>   void __f(const char* names, Arg1&& arg1, Args&&... args) {       const char* comma = strchr(names + 1,  , );       cout.write(names, comma - names) <<   :   << arg1 <<   |  ;       __f(comma + 1, args...);   }   #else   #define trace(...)   #endif      /*/-----------------------------MODULAR ARITHMETIC----------------------------------/*/      // const ll modx = 1e9 + 7;   const ll modx = 998244353;   const ll mod = modx;   inline ll add(ll x, ll y, ll mod = modx) {       x += y;       if (x >= mod) return x - mod;       return x % mod;   }   inline ll sub(ll x, ll y, ll mod = modx) {       x -= y;       if (x < 0) return x + mod;       return x;   }   inline ll mul(ll x, ll y, ll mod = modx) {       return (x * 1ll * y) % mod;   }   inline ll expo(ll x, ll y, ll mod = modx) {       ll ans = 1;       while (y) {           if (y & 1) ans = mul(ans, x, mod);           x = mul(x, x, mod);           y >>= 1;       }       return ans % mod;   }   inline ll inv(ll x, ll mod = modx) {       return expo(x, mod - 2, mod);   }   /*/-----------------------------CODE BEGINS----------------------------------/*/   #define int long long   ll rr[] = {0, 1, 1, 1, 0, -1, -1, -1};   ll cc[] = {1, 1, 0, -1, -1, -1, 0, 1};  //x-y -> URDL , row-column -> RDLU; 0-based;      const ll MAXN = 2e5 + 100, MAX2N = 2e3 + 10, LG = 20, INF = 2e18, base = 33;   const int N = 1e5 + 5;   ll n, m, k, q, x,  y, z, a[MAXN], d[MAXN], p[MAXN], vis[MAXN];   vector<ll>g[MAXN]; ll dp[MAXN];   void fill()   {       for (ll i = 0; i <= n; i++)           d[i] = -1, p[i] = -1, dp[i] = 0, g[i].clear(), vis[i] = 0;   }   void dijkstra(ll s) {       d[s] = 0;       queue<ll>q;       q.push(s);       while (!q.empty()) {           ll v = q.front();           q.pop();           for (auto u : g[v])           {               if (d[u] == -1)               {                   d[u] = d[v] + 1;                   q.push(u);               }           }       }   }   void dfs(ll s)   {       vis[s] = 1;       dp[s] = d[s];       for (auto to : g[s])       {           if (!vis[to] && d[s] < d[to]) {               dfs(to);           }           if (d[s] < d[to])               dp[s] = min(dp[s], dp[to]);           else               dp[s] = min(dp[s], d[to]);       }   }   void solve()   {       cin >> n >> m;       fill();       for (ll i = 0; i < m; i++)       {           ll u, v; cin >> u >> v; --u, --v;           g[u].pb(v);       }       dijkstra(0);       dfs(0);       for (ll i = 0; i < n; i++)           cout << dp[i] <<    ;       cout <<   n ;   }   signed main()   {       bolt;   #ifndef ONLINE_JUDGE       djokovic;   #endif       ll t;       t = 1;       cin >> t;       for (ll i = 1; i <= t; i++)       {           //cout <<  Case #  << i <<  :  ;           solve();       }       //rtime();   }   