#pragma GCC optimize("Ofast") #include "bits/stdc++.h" // Begin Header {{{ #pragma region using namespace std; #ifndef DEBUG #define dump(...) #endif #define all(x) begin(x), end(x) #define rall(x) rbegin(x), rend(x) #define rep(i, b, e) for (intmax_t i = (b), i##_limit = (e); i < i##_limit; ++i) #define repc(i, b, e) for (intmax_t i = (b), i##_limit = (e); i <= i##_limit; ++i) #define repr(i, b, e) for (intmax_t i = (b), i##_limit = (e); i >= i##_limit; --i) #define var(Type, ...) Type __VA_ARGS__; input(__VA_ARGS__) #define let const auto constexpr size_t operator""_zu(unsigned long long value) { return value; }; constexpr intmax_t operator""_jd(unsigned long long value) { return value; }; constexpr uintmax_t operator""_ju(unsigned long long value) { return value; }; constexpr int INF = 0x3f3f3f3f; constexpr intmax_t LINF = 0x3f3f3f3f3f3f3f3f_jd; using usize = size_t; using imax = intmax_t; using uimax = uintmax_t; using ld = long double; template > using MaxHeap = priority_queue, Compare>; template > using MinHeap = priority_queue, Compare>; inline void input() {} template inline void input(Head&& head, Tail&&... tail) { cin >> head; input(forward(tail)...); } template ::value, nullptr_t> = nullptr> inline istream& operator>>(istream &is, Container &vs) { for (auto &v: vs) is >> v; return is; } template inline istream& operator>>(istream &is, pair &p) { is >> p.first >> p.second; return is; } inline void output() { cout << "\n"; } template inline void output(Head&& head, Tail&&... tail) { cout << head; if (sizeof...(tail)) cout << " "; output(forward(tail)...); } template ::value, nullptr_t> = nullptr> inline ostream& operator<<(ostream &os, const Container &vs) { static constexpr const char *delim[] = {" ", ""}; for (auto it = begin(vs); it != end(vs); ++it) { os << delim[it == begin(vs)] << *it; } return os; } template inline void join(const Iterator &Begin, const Iterator &End, const string &delim = "\n", const string &last = "\n") { for (auto it = Begin; it != End; ++it) { cout << ((it == Begin) ? "" : delim) << *it; } cout << last; } template inline vector makeVector(const T &init_value, size_t sz) { return vector(sz, init_value); } template inline auto makeVector(const T &init_value, size_t sz, Args... args) { return vector(init_value, args...))>(sz, makeVector(init_value, args...)); } template class FixPoint : Func { public: explicit constexpr FixPoint(Func&& f) noexcept : Func(forward(f)) {} template constexpr decltype(auto) operator()(Args&&... args) const { return Func::operator()(*this, std::forward(args)...); } }; template static inline constexpr decltype(auto) makeFixPoint(Func&& f) noexcept { return FixPoint{forward(f)}; } template struct reverse_t { Container &c; reverse_t(Container &c) : c(c) {} auto begin() { return c.rbegin(); } auto end() { return c.rend(); } }; template auto reversed(Container &c) { return reverse_t(c); } template inline bool chmax(T &a, const T &b) noexcept { return b > a && (a = b, true); } template inline bool chmin(T &a, const T &b) noexcept { return b < a && (a = b, true); } template inline T diff(const T &a, const T &b) noexcept { return a < b ? b - a : a - b; } void operator|=(vector::reference lhs, const bool rhs) { lhs = lhs | rhs; } void operator&=(vector::reference lhs, const bool rhs) { lhs = lhs & rhs; } void operator^=(vector::reference lhs, const bool rhs) { lhs = lhs ^ rhs; } void ioinit() { ios_base::sync_with_stdio(false); cin.tie(nullptr); cout << fixed << setprecision(10); cerr << fixed << setprecision(10); clog << fixed << setprecision(10); } #pragma endregion // }}} End Header // Edge {{{ template struct Edge { size_t from, to; Weight weight; Edge() {} Edge(size_t from, size_t to, Weight weight = 1) : from(from), to(to), weight(weight) {} bool operator<(const Edge &rhs) const { return weight < rhs.weight; } bool operator>(const Edge &rhs) const { return weight > rhs.weight; } operator size_t() const { return to; } }; // }}} // Graph {{{ template class Graph : public vector>> { using graph = vector>>; public: Graph() {} Graph(const size_t V) : graph(V) {} void connect(size_t from, size_t to, Weight weight = 1) { (*this)[from].emplace_back(from, to, weight); } friend ostream& operator<<(ostream &strm, const Graph &G) { for (size_t v = 0; v < G.size(); ++v) { strm << '[' << setw(2) << v << ']'; for (const auto &e: G[v]) { strm << ' ' << setw(2) << e.to; } strm << '\n'; } return strm; } }; // }}} int main() { ioinit(); var(usize, N, M); Graph G(N); rep(_, 0, M) { var(usize, s, t); var(imax, d); s--, t--; G.connect(s, t, d); G.connect(t, s, d); } const auto f = [&](imax w) { queue que; que.emplace(0); vector dp(N, LINF); dp[0] = 0; while (!que.empty()) { let cur = que.front(); que.pop(); for (let e: G[cur]) { if (w > e.weight) continue; if (chmin(dp[e.to], dp[cur] + 1)) { que.emplace(e.to); } } } return dp.back(); }; imax ok = 0, ng = LINF; while (ng - ok > 1) { imax mid = (ok + ng) / 2; if (f(mid) != LINF) ok = mid; else ng = mid; } output(ok, f(ok)); return 0; }