結果

問題 No.241 出席番号(1)
ユーザー kei
提出日時 2018-09-25 22:52:42
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 3 ms / 2,000 ms
コード長 3,172 bytes
コンパイル時間 1,817 ms
コンパイル使用メモリ 175,952 KB
実行使用メモリ 5,248 KB
最終ジャッジ日時 2024-11-30 22:21:28
合計ジャッジ時間 3,118 ms
ジャッジサーバーID
(参考情報)
judge2 / judge4
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 3
other AC * 29
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const int INF = 1e9;
const ll LINF = 1e18;
template<class S,class T> ostream& operator << (ostream& out,const pair<S,T>& o){ out << "(" << o.first << "," << o.second << ")"; return out; }
template<class T> ostream& operator << (ostream& out,const vector<T> V){ for(int i = 0; i < V.size(); i++){ out << V[i]; if(i!=V.size()-1) out << " "
    ;} return out; }
template<class T> ostream& operator << (ostream& out,const vector<vector<T> > Mat){ for(int i = 0; i < Mat.size(); i++) { if(i != 0) out << endl; out
    << Mat[i];} return out; }
template<class S,class T> ostream& operator << (ostream& out,const map<S,T> mp){ out << "{ "; for(auto it = mp.begin(); it != mp.end(); it++){ out <<
    it->first << ":" << it->second; if(mp.size()-1 != distance(mp.begin(),it)) out << ", "; } out << " }"; return out; }
/*
<url:https://yukicoder.me/problems/no/241>
============================================================
=================================================================
=============================================================
================================================================
*/
struct edge {
int to; //
int cap; //
int rev; //
edge() {}
edge(int to, int cap, int rev) :to(to), cap(cap), rev(rev) {}
};
vector<vector<edge>> G; //
vector<int> used; // DFS調
// fromtocap
void add_edge(int from, int to, int cap) {
G[from].push_back(edge(to, cap, G[to].size()));
G[to].push_back(edge(from, 0, G[from].size() - 1));
}
// DFS
int dfs(int v, int t, int f) {
if (v == t) return f;
used[v] = true;
for (int i = 0; i < G[v].size(); i++) {
edge &e = G[v][i];
if (!used[e.to] && e.cap > 0) {
int d = dfs(e.to, t, min(f, e.cap));
if (d > 0) {
e.cap -= d;
G[e.to][e.rev].cap += d;
return d;
}
}
}
return 0;
}
// st
int max_flow(int s, int t) {
int flow = 0;
for (;;) {
fill(used.begin(), used.end(), 0);
int f = dfs(s, t, INF);
if (f == 0) return flow;
flow += f;
}
}
void solve(){
int N; cin >> N;
vector<int> A(N); for(auto& in:A) cin >> in;
int S = 2*N,T = S+1;
G.resize(2*N+2); used.resize(2*N+2);
for(int i = 0; i < N;i++){
add_edge(S, i, 1);
add_edge(i+N, T, 1);
for(int j = 0; j < N;j++){
if(A[i] == j) continue;
add_edge(i,j+N,1);
}
}
int mflow = max_flow(S, T);
if(mflow != N){
cout << -1 << endl;
return;
}
for(int i = 0; i < N;i++){
for(auto e:G[i]){
if(e.cap == 0){
cout << e.to-N << endl;
break;
}
}
}
}
int main(void) {
cin.tie(0); ios_base::sync_with_stdio(false);
solve();
return 0;
}
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