結果
問題 | No.2563 色ごとのグループ |
ユーザー |
|
提出日時 | 2023-12-02 15:03:48 |
言語 | Java (openjdk 23) |
結果 |
AC
|
実行時間 | 742 ms / 2,000 ms |
コード長 | 2,114 bytes |
コンパイル時間 | 2,488 ms |
コンパイル使用メモリ | 78,816 KB |
実行使用メモリ | 67,868 KB |
最終ジャッジ日時 | 2024-09-26 17:58:45 |
合計ジャッジ時間 | 14,373 ms |
ジャッジサーバーID (参考情報) |
judge3 / judge2 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 35 |
ソースコード
import java.util.*;import java.io.*;class Main{private static final BufferedReader br =new BufferedReader(new InputStreamReader(System.in));private static final PrintWriter out =new PrintWriter(System.out);public static void main(String[] args)throws IOException{String[] str = br.readLine().split(" ");int N = Integer.parseInt(str[0]);int M = Integer.parseInt(str[1]);int[] C = new int[N];str = br.readLine().split(" ");for(int i=0;i<N;i++)C[i] = Integer.parseInt(str[i]);HashMap<Integer,int[]> map = new HashMap<>();for(int i=0;i<N;i++){if(map.containsKey(C[i]))map.get(C[i])[1]++;elsemap.put(C[i],new int[]{0,1});}UnionFind uf = new UnionFind(N+1);while(M-->0){str = br.readLine().split(" ");int u = Integer.parseInt(str[0]);int v = Integer.parseInt(str[1]);if(C[u-1]==C[v-1])if(uf.unite(u,v))map.get(C[u-1])[0]++;}int ans = 0;for(int[] temp:map.values())ans += temp[1]-temp[0]-1;out.println(ans);br.close();out.close();}}final class UnionFind {private final int[] par, rank, size, path;private int count;public UnionFind ( final int N ) {count = N;par = new int[N];rank = new int[N];size = new int[N];path = new int[N];Arrays.fill( par, -1 );Arrays.fill( size, 1 );}public int root ( final int ind ) {if ( par[ind] == -1 ) {return ind;}else {return par[ind] = root( par[ind] );}}public boolean isSame ( final int x, final int y ) {return root( x ) == root( y );}public boolean unite ( final int x, final int y ) {int rx = root( x );int ry = root( y );++path[rx];if ( rx == ry ) {return false;}if ( rank[rx] < rank[ry] ) {int temp = rx;rx = ry;ry = temp;}par[ry] = rx;if ( rank[rx] == rank[ry] ) {++rank[rx];}path[rx] += path[ry];size[rx] += size[ry];--count;return true;}public int groupCount () {return count;}public int pathCount ( final int x ) {return path[root( x )];}public int size ( final int x ) {return size[root( x )];}}