#include using namespace std; #define F first #define S second #define pi M_PI #define R cin>> #define Z class #define ll long long #define ln cout<<'\n' #define in(a) insert(a) #define pb(a) push_back(a) #define pd(a) printf("%.10f\n",a) #define mem(a) memset(a,0,sizeof(a)) #define all(c) (c).begin(),(c).end() #define iter(c) __typeof((c).begin()) #define rrep(i,n) for(int i=(int)(n)-1;i>=0;i--) #define REP(i,m,n) for(int i=(int)(m);i<(int)(n);i++) #define rep(i,n) REP(i,0,n) #define tr(it,c) for(iter(c) it=(c).begin();it!=(c).end();it++) templatevoid pr(A a){cout<void pr(A a,B b){cout<void pr(A a,B b,C c){cout<void pr(A a,B b,C c,D d){cout<void PR(A a,ll n){rep(i,n){if(i)cout<<' ';cout<=0&&x=0&&y P; void Main() { int n,m; cin >> n >> m; vector

v[2][n]; int e[2][n];mem(e); rep(i,m) { int x,y,z; cin >> x >> y >> z; v[0][x].pb(P(y,z)); v[1][y].pb(P(x,z)); e[0][y]++; e[1][x]++; } int d[2][n]; rep(i,2)rep(j,n)d[i][j]=-MAX; rep(t,2) { priority_queue

que; if(!t) { d[t][0]=0; que.push(P(0,0)); } else { d[t][n-1]=0; que.push(P(0,n-1)); } while(!que.empty()) { P p=que.top();que.pop(); int x=p.S,c=p.F; if(d[t][x]>c) continue; rep(i,v[t][x].size()) { P q=v[t][x][i]; int y=q.F,cc=q.S; if(d[t][y]