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#define PROBLEM "https://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=GRL_1_B" #include <bits/stdc++.h> #include "graph/bellman_ford.hpp" #include "graph/read_graph.hpp" int main() { int N, M, r; std::cin >> N >> M >> r; auto G = read_graph<int>(N, M, true, true, 0); std::vector<int> s = {r}; const int INF = 1 << 30; auto [dist, par, root] = bellman_ford(G, s, INF); int ans = *std::min_element(dist.begin(), dist.end()); if (ans == -INF) { std::cout << "NEGATIVE CYCLE" << '\n'; } else { for (int i = 0; i < N; i++) { if (dist[i] == INF) { std::cout << "INF" << '\n'; } else { std::cout << dist[i] << '\n'; } } } return 0; }
#line 1 "verify/aoj_grl/aoj_grl_1_b.test.cpp" #define PROBLEM "https://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=GRL_1_B" #include <bits/stdc++.h> #line 2 "graph/bellman_ford.hpp" #line 2 "graph/graph_template.hpp" #line 4 "graph/graph_template.hpp" template <class T> struct Edge { int from, to; T cost; int id; Edge() = default; Edge(int from, int to, T cost = 1, int id = -1) : from(from), to(to), cost(cost), id(id) {} friend std::ostream &operator<<(std::ostream &os, const Edge<T> &e) { // output format: "{ id : from -> to, cost }" return os << "{ " << e.id << " : " << e.from << " -> " << e.to << ", " << e.cost << " }"; } }; template <class T> using Edges = std::vector<Edge<T>>; template <class T> using Graph = std::vector<std::vector<Edge<T>>>; #line 4 "graph/bellman_ford.hpp" template <class T> std::tuple<std::vector<T>, std::vector<int>, std::vector<int>> // bellman_ford(Graph<T> &G, std::vector<int> &s, const T INF) { int N = (int)G.size(); std::vector<T> dist(N, INF); std::vector<int> par(N, -1), root(N, -1); for (auto &v : s) { dist[v] = 0; root[v] = v; } int loop_count = 0; while (true) { loop_count++; bool update = false; for (int cur = 0; cur < N; cur++) { if (dist[cur] == INF) continue; for (auto &e : G[cur]) { T nd = std::max(-INF, dist[cur] + e.cost); if (dist[e.to] > nd) { par[e.to] = cur; root[e.to] = root[cur]; update = true; if (loop_count >= N) nd = -INF; dist[e.to] = nd; } } } if (!update) break; } return {dist, par, root}; } #line 2 "graph/read_graph.hpp" #line 4 "graph/read_graph.hpp" template <class T> Graph<T> read_graph(const int n, const int m, const bool weight = false, const bool directed = false, const int offset = 1) { Graph<T> g(n); for (int i = 0; i < m; i++) { int a, b; std::cin >> a >> b; a -= offset, b -= offset; if (weight) { T c; std::cin >> c; if (!directed) g[b].push_back(Edge(b, a, c, i)); g[a].push_back(Edge(a, b, c, i)); } else { // c = 1 if (!directed) g[b].push_back(Edge(b, a, T(1), i)); g[a].push_back(Edge(a, b, T(1), i)); } } return g; } template <class T> Graph<T> read_parent(const int n, const bool weight = false, const bool directed = false, const int offset = 1) { Graph<T> g(n); for (int i = 1; i < n; i++) { int p; std::cin >> p; p -= offset; if (weight) { T c; std::cin >> c; if (!directed) g[i].push_back(Edge(i, p, c, i - 1)); g[p].push_back(Edge(p, i, c, i - 1)); } else { // c = 1 if (!directed) g[i].push_back(Edge(i, p, T(1), i - 1)); g[p].push_back(Edge(p, i, T(1), i - 1)); } } return g; } std::tuple<Graph<int>, std::vector<std::vector<int>>, std::vector<std::pair<int, int>>> read_grid(const int h, const int w, std::string rel = ".#") { std::vector<std::string> s(h); std::vector id(h, std::vector<int>(w, -1)); std::vector<std::pair<int, int>> loc; int n = 0; for (int i = 0; i < h; i++) { std::cin >> s[i]; for (int j = 0; j < w; j++) { if (s[i][j] == rel[1]) { id[i][j] = n++; loc.emplace_back(i, j); } } } int m = 0; Graph<int> g(n); for (int i = 0; i < h; i++) { for (int j = 0; j < w; j++) { if (s[i][j] == rel[1]) { if (i + 1 < h and s[i + 1][j] == rel[1]) { g[id[i][j]].push_back(Edge(id[i][j], id[i + 1][j], 1, m)); g[id[i + 1][j]].push_back(Edge(id[i + 1][j], id[i][j], 1, m++)); } if (j + 1 < w and s[i][j + 1] == rel[1]) { g[id[i][j]].push_back(Edge(id[i][j], id[i][j + 1], 1, m)); g[id[i][j + 1]].push_back(Edge(id[i][j + 1], id[i][j], 1, m++)); } } } } return {g, id, loc}; } #line 7 "verify/aoj_grl/aoj_grl_1_b.test.cpp" int main() { int N, M, r; std::cin >> N >> M >> r; auto G = read_graph<int>(N, M, true, true, 0); std::vector<int> s = {r}; const int INF = 1 << 30; auto [dist, par, root] = bellman_ford(G, s, INF); int ans = *std::min_element(dist.begin(), dist.end()); if (ans == -INF) { std::cout << "NEGATIVE CYCLE" << '\n'; } else { for (int i = 0; i < N; i++) { if (dist[i] == INF) { std::cout << "INF" << '\n'; } else { std::cout << dist[i] << '\n'; } } } return 0; }