#define _USE_MATH_DEFINES #include #include #include #include #include //#include #include #include #include #include #include #include ///////// #define REP(i, x, n) for(int i = x; i < n; i++) #define rep(i,n) REP(i,0,n) #define P(p) cout<<(p)< ///////// typedef long long LL; typedef long double LD; ///////// using namespace::std; ///////// vector< vector< PII > > line(101); int main(void){ std::cin.tie(0); std::ios::sync_with_stdio(false); std::cout << std::fixed;// //cout << setprecision(10);// int N,M; cin>>N>>M; int P,Q,R; rep(i,M){ cin>>P>>Q>>R; line[R].push_back(PII(P,Q)); } int ans[101]; rep(i,101)ans[i]=0; set makeSet,nextSet; makeSet.insert(N); ans[N] = 1; int now; set::iterator itr; vector::iterator itr2; while( !makeSet.empty() ){ itr = makeSet.begin(); while( itr != makeSet.end() ){ itr2 = line[*itr].begin(); if(itr2 != line[*itr].end() ) { while( itr2 != line[*itr].end() ){ ans[itr2->first] += itr2->second * ans[*itr]; nextSet.insert( itr2->first ); ++itr2; } ans[*itr] = 0; } ++itr; } makeSet = nextSet; nextSet.clear(); } for(int i=1;i