#include using namespace std; #define rep(i,n) for(ll i=0;i=0;i--) #define perl(i,r,l) for(ll i=r-1;i>=l;i--) #define fi first #define se second #define pb push_back #define ins insert #define pqueue(x) priority_queue,greater> #define all(x) (x).begin(),(x).end() #define CST(x) cout<> #define rev(x) reverse(x); using ll=long long; using vl=vector; using vvl=vector>; using pl=pair; using vpl=vector; using vvpl=vector; const ll MOD=1000000007; const ll MOD9=998244353; const int inf=1e9+10; const ll INF=4e18; const ll dy[8]={1,0,-1,0,1,1,-1,-1}; const ll dx[8]={0,-1,0,1,1,-1,1,-1}; template inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; } template inline bool chmax(T& a, T b) { if (a <= b) { a = b; return true; } return false; } vl topsort(vvl &g){ ll n=g.size(); vl ans,ind(n); rep(i,n)for(auto e:g[i])ind[e]++; queue que; rep(i,n)if(!ind[i])que.push(i); while(!que.empty()){ ll v=que.front();que.pop(); ans.pb(v); for(auto nv:g[v]){ ind[nv]--;if(!ind[nv])que.push(nv); } } return ans; } int main(){ ll n,m;cin >> n >>m; vvl g(n); vvpl need(n); rep(i,m){ ll a,b,c;cin >> a >> b >> c; a--;c--; g[a].pb(c); need[c].pb({a,b}); } vl ret=topsort(g); vl dp(n);dp[n-1]=1; //for(auto p:ret)cout << p+1 <