/* このコード、と~おれ! Be accepted! ∧_∧  (。・ω・。)つ━☆・*。 ⊂   ノ    ・゜+.  しーJ   °。+ *´¨)          .· ´¸.·*´¨) ¸.·*¨)           (¸.·´ (¸.·'* ☆ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include //#pragma GCC target("arch=skylake-avx512") //#pragma GCC target("avx2") //#pragma GCC optimize("O3") //#pragma GCC optimize("Ofast") //#pragma GCC target("sse4") //#pragma GCC optimize("unroll-loops") //#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native") #define repeat(i, n, m) for(int i = n; i < (m); ++i) #define rep(i, n) for(int i = 0; i < (n); ++i) #define printynl(a) printf(a ? "yes\n" : "no\n") #define printyn(a) printf(a ? "Yes\n" : "No\n") #define printYN(a) printf(a ? "YES\n" : "NO\n") #define printim(a) printf(a ? "possible\n" : "imposible\n") #define printdb(a) printf("%.50lf\n", a) #define printLdb(a) printf("%.50Lf\n", a) #define printdbd(a) printf("%.16lf\n", a) #define prints(s) printf("%s\n", s.c_str()) #define all(x) (x).begin(), (x).end() #define deg_to_rad(deg) (((deg)/360.0L)*2.0L*PI) #define rad_to_deg(rad) (((rad)/2.0L/PI)*360.0L) #define Please return #define AC 0 #define manhattan_dist(a, b, c, d) (abs(a - c) + abs(b - d)) using ll = long long; using ull = unsigned long long; constexpr int INF = 1073741823; constexpr int MINF = -1073741823; constexpr ll LINF = ll(4661686018427387903); constexpr ll MOD = 1e9 + 7; constexpr ll mod = 998244353; constexpr long double eps = 1e-6; const long double PI = acosl(-1.0L); using namespace std; void scans(string& str) { char c; str = ""; scanf("%c", &c); if (c == '\n')scanf("%c", &c); while (c != '\n' && c != -1 && c != ' ') { str += c; scanf("%c", &c); } } void scanc(char& str) { char c; scanf("%c", &c); if (c == -1)return; while (c == '\n') { scanf("%c", &c); } str = c; } double acot(double x) { return PI / 2 - atan(x); } ll LSB(ll n) { return (n & (-n)); } template inline T chmin(T& a, const T& b) { if (a > b)a = b; return a; } template inline T chmax(T& a, const T& b) { if (a < b)a = b; return a; } //cpp_int #if __has_include() #include #include using namespace boost::multiprecision; #else using cpp_int = ll; #endif //atcoder library #if __has_include() #include //using namespace atcoder; #endif /* random_device seed_gen; mt19937 engine(seed_gen()); uniform_int_distribution dist(1, 100); */ /*----------------------------------------------------------------------------------*/ /* * @title template(graph) * @docs kyopro/docs/graph_template.md */ template struct edge { T cost; int from, to; edge(int from, int to) : from(from), to(to), cost(T(1)) {} edge(int from, int to, T cost) : from(from), to(to), cost(cost) {} }; template struct graph { int n; bool directed, weighted; vector>> g; graph(int n, bool directed, bool weighted) : g(n), n(n), directed(directed), weighted(weighted) {} void add_edge(int from, int to, T cost = T(1)) { g[from].emplace_back(from, to, cost); if (not directed) { g[to].emplace_back(to, from, cost); } } vector>& operator[](const int& idx) { return g[idx]; } void read(int e, bool one_indexed) { int a, b, c = 1; while (e--) { scanf("%d%d", &a, &b); if (weighted) { scanf("%d", &c); } if (one_indexed)--a, --b; add_edge(a, b, c); } } void read(int e, bool one_indexed, const string& format) { int a, b; T c = T(1); while (e--) { scanf("%d%d", &a, &b); if (weighted) { scanf(format.c_str(), &c); } if (one_indexed)--a, --b; add_edge(a, b, c); } } }; /* * @title unionfind * @docs kyopro/docs/unionfind.md */ //0-indexed struct unionfind { vector par, siz; unionfind(int n) : par(n), siz(n) { for (int i = 0; i < n; ++i) { //全部根で初期化 par[i] = i; //サイズは1 siz[i] = 1; } } void init(int n) { par.resize(n); siz.resize(n); for (int i = 0; i < n; ++i) { //全部根で初期化 par[i] = i; //サイズは1 siz[i] = 1; } } //根を返す int find(int a) { return par[a] == a ? a : par[a] = find(par[a]); } //くっつける。元から同じだったらfalseを返す bool unite(int a, int b) { int x = find(a), y = find(b); if (x == y)return false; else if (siz[x] < siz[y]) { par[x] = y; siz[y] += siz[x]; } else if (siz[x] > siz[y]) { par[y] = x; siz[x] += siz[y]; } else { par[x] = y; siz[y] += siz[x]; } return true; } //同じ集合か判定する bool same(int a, int b) { return find(a) == find(b); } //サイズを返す int size(int a) { return siz[find(a)]; } }; int main() { int n, m; scanf("%d%d", &n, &m); graph g(n, false, true); unionfind uni(n); vector> e(m); for (auto& [p, q, r] : e)scanf("%d%d%d", &q, &r, &p); sort(all(e), greater>()); int w = -1; for (auto& [p, q, r] : e) { uni.unite(q - 1, r - 1); if (uni.same(0, n - 1)) { w = p; break; } } printf("%d ", w); for (auto& [p, q, r] : e) { if (w <= p)g.add_edge(q - 1, r - 1); } vector cost(n); fill(all(cost), INF); queue> que; que.push({ 0, 0 }); while (not que.empty()) { auto [cur, c] = que.front(); que.pop(); if (cost[cur] < c)continue; cost[cur] = c; for (const auto& aa : g[cur]) { if (cost[aa.to] > c) { que.push({ aa.to, c + 1 }); cost[aa.to] = c + 1; } } } printf("%d\n", cost[n - 1]); Please AC; }