結果
問題 | No.241 出席番号(1) |
ユーザー |
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提出日時 | 2020-11-29 21:41:20 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 3 ms / 2,000 ms |
コード長 | 3,769 bytes |
コンパイル時間 | 1,364 ms |
コンパイル使用メモリ | 89,508 KB |
最終ジャッジ日時 | 2025-01-16 10:16:17 |
ジャッジサーバーID (参考情報) |
judge5 / judge5 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 29 |
ソースコード
#include <iostream>#include <vector>#include <algorithm>#include <string>#include <numeric>#include <utility>#include <tuple>#define rep(i, a, b) for (int i = int(a); i < int(b); i++)using namespace std;using ll = long long int;using P = pair<ll, ll>;// clang-format off#ifdef _DEBUG_#define dump(...) do{ cerr << __LINE__ << ":\t" << #__VA_ARGS__ << " = "; PPPPP(__VA_ARGS__); cerr << endl; } while(false)template<typename T> void PPPPP(T t) { cerr << t; }template<typename T, typename... S> void PPPPP(T t, S... s) { cerr << t << ", "; PPPPP(s...); }#else#define dump(...) do{ } while(false)#endiftemplate<typename T> vector<T> make_v(size_t a, T b) { return vector<T>(a, b); }template<typename... Ts> auto make_v(size_t a, Ts... ts) { return vector<decltype(make_v(ts...))>(a, make_v(ts...)); }template<typename T> bool chmin(T &a, T b) { if (a > b) {a = b; return true; } return false; }template<typename T> bool chmax(T &a, T b) { if (a < b) {a = b; return true; } return false; }template<typename T> void print(T a) { cout << a << '\n'; }template<typename T, typename... Ts> void print(T a, Ts... ts) { cout << a << ' '; print(ts...); }template<typename T> istream &operator,(istream &in, T &t) { return in >> t; }// clang-format on#include <queue>template<typename T>class Dinic {struct Edge {int to, rev;T cap;Edge(int t, int r, T c): to(t), rev(r), cap(c) {}};int n;vector<int> level;vector<int> itr;bool bfs(int s, int t) {queue<int> que;level.assign(n, -1);level[s] = 0;que.emplace(s);while (que.size()) {int v = que.front();que.pop();for (auto &edge : G[v]) {if (edge.cap > 0 && level[edge.to] == -1) {level[edge.to] = level[v] + 1;que.emplace(edge.to);}}}return level[t] != -1;}T dfs(int v, int t, T flow) {if (v == t) return flow;for (int &i = itr[v]; i < static_cast<int>(G[v].size()); i++) {auto &edge = G[v][i];if (edge.cap > 0 && level[v] < level[edge.to]) {T d = dfs(edge.to, t, min(flow, edge.cap));if (d > 0) {edge.cap -= d;G[edge.to][edge.rev].cap += d;return d;}}}return 0;}public:vector<vector<Edge>> G;Dinic(int _n) {n = _n;G.resize(n);}void add_edge(int s, int t, T cap) {G[s].emplace_back(t, G[t].size(), cap);G[t].emplace_back(s, static_cast<int>(G[s].size() - 1), 0);}T max_flow(int s, int t, T inf) {T ans = 0;while (bfs(s, t)) {itr.assign(n, 0);for (T f = 0; (f = dfs(s, t, inf)) > 0; ans += f);}return ans;}};int main() {cin.tie(nullptr);ios::sync_with_stdio(false);int n;cin, n;int start = 2 * n, goal = start + 1;Dinic<int> dinic(goal + 1);rep(i, 0, n) {int ng;cin, ng;dinic.add_edge(start, i, 1);dinic.add_edge(i + n, goal, 1);rep(j, 0, n) {if (ng == j) continue;dinic.add_edge(i, j + n, 1);}}int sz = dinic.max_flow(start, goal, n);if (sz == n) {rep(i, 0, n) {for (auto edge : dinic.G[i]) {if (n <= edge.to && edge.to < 2 * n && edge.cap == 0) {print(edge.to - n);break;}}}} else {print(-1);}return 0;}