結果
| 問題 |
No.519 アイドルユニット
|
| コンテスト | |
| ユーザー |
uafr_cs
|
| 提出日時 | 2017-11-08 15:21:33 |
| 言語 | Java (openjdk 23) |
| 結果 |
TLE
|
| 実行時間 | - |
| コード長 | 2,600 bytes |
| コンパイル時間 | 2,968 ms |
| コンパイル使用メモリ | 80,184 KB |
| 実行使用メモリ | 93,824 KB |
| 最終ジャッジ日時 | 2024-11-24 05:56:36 |
| 合計ジャッジ時間 | 46,592 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 15 TLE * 19 |
ソースコード
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Scanner;
public class Main {
public static class Edge implements Comparable<Edge> {
int from, to, cost;
public Edge(int from, int to, int cost){
this.from = from;
this.to = to;
this.cost = cost;
}
@Override
public int compareTo(Edge o) {
return Integer.compare(this.cost, o.cost);
}
}
public static int answer = Integer.MAX_VALUE;
public static void rec(int[] match, int prev, int matched, int n, ArrayList<ArrayList<Edge>> adj, int opt){
if(opt >= answer){ return; }
//System.out.println(answer);
int from = prev + 1;
while(from < n && match[from] >= 0){ from++; }
//System.out.println(from);
for(final Edge edge : adj.get(from)){
final int to = edge.to;
if(match[to] >= 0){ continue; }
final int next_opt = opt + edge.cost;
final int next_matched = matched + 2;
match[to] = from; match[from] = to;
if(next_matched < n){ rec(match, from, next_matched, n, adj, next_opt); }
else{ answer = Math.min(answer, next_opt); }
match[to] = match[from] = -1;
}
}
public static int solve_dfs(int n, int[][] adj){
ArrayList<ArrayList<Edge>> sorted = new ArrayList<ArrayList<Edge>>();
for(int i = 0; i < n; i++){
ArrayList<Edge> inner = new ArrayList<Edge>();
for(int j = i + 1; j < n; j++){ inner.add(new Edge(i, j, adj[i][j])); }
Collections.sort(inner);
sorted.add(inner);
}
int[] match = new int[n];
Arrays.fill(match, -1);
rec(match, -1, 0, n, sorted, 0);
return answer;
}
public static int solve_DP(int n, int[][] adj){
int[] DP = new int[1 << n];
Arrays.fill(DP, Integer.MAX_VALUE / 2 - 1);
DP[0] = 0;
for(int bit = 0; bit < (1 << n); bit++){
//System.out.println(bit);
int i = 0;
for (; (bit & (1 << i)) != 0; ++i);
final int fst = 1 << i;
for(int j = i + 1; j < n; j++){
final int snd = 1 << j;
final int next_bit = bit | fst | snd;
DP[next_bit] = Math.min(DP[next_bit], DP[bit] + adj[i][j]);
}
}
return DP[(1 << n) - 1];
}
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
final int n = sc.nextInt();
final int max = 1000;
int[][] adj = new int[n][n];
for(int i = 0; i < n; i++){
for(int j = 0; j < n; j++){
adj[i][j] = max - sc.nextInt();
}
}
//final int solve = solve_DP(n, adj);
final int solve = solve_dfs(n, adj);
System.out.println(max * (n / 2) - solve);
}
}
uafr_cs