結果

問題 No.1059 素敵な集合
ユーザー OlandOland
提出日時 2020-05-26 18:28:23
言語 Java21
(openjdk 21)
結果
AC  
実行時間 96 ms / 2,000 ms
コード長 8,322 bytes
コンパイル時間 2,139 ms
コンパイル使用メモリ 75,304 KB
実行使用メモリ 54,244 KB
最終ジャッジ日時 2023-09-30 15:38:21
合計ジャッジ時間 4,477 ms
ジャッジサーバーID
（参考情報） 		judge14 / judge15
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 42 ms
49,684 KB
testcase_01 AC 66 ms
52,936 KB
testcase_02 AC 71 ms
50,900 KB
testcase_03 AC 42 ms
47,412 KB
testcase_04 AC 43 ms
49,908 KB
testcase_05 AC 42 ms
49,832 KB
testcase_06 AC 62 ms
51,244 KB
testcase_07 AC 61 ms
52,124 KB
testcase_08 AC 63 ms
51,612 KB
testcase_09 AC 47 ms
49,564 KB
testcase_10 AC 72 ms
51,960 KB
testcase_11 AC 61 ms
51,704 KB
testcase_12 AC 56 ms
51,092 KB
testcase_13 AC 76 ms
51,336 KB
testcase_14 AC 44 ms
49,516 KB
testcase_15 AC 86 ms
54,036 KB
testcase_16 AC 61 ms
51,132 KB
testcase_17 AC 61 ms
51,248 KB
testcase_18 AC 47 ms
49,636 KB
testcase_19 AC 94 ms
54,188 KB
testcase_20 AC 96 ms
54,244 KB
testcase_21 AC 74 ms
54,116 KB
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ソースコード

diff # 

import java.io.*;
import java.util.*;

@SuppressWarnings("unused")
public class Main {
    FastScanner in;
    PrintWriter out;
    final static int MOD = (int)1e9+7;
    
    void solve(){
        int L = in.nextInt(), R = in.nextInt();
        boolean[] visited = new boolean[R-L+1];
        UnionFind uf = new UnionFind(R-L+1);
        for(int i = L; i < R; i++){
            if(!visited[i-L]){
                for(int j = i + i; j <= R; j += i){
                    visited[j-L] = true;
                    uf.unite(i-L, j-L);
                }
            }
        }
        out.println((uf.group() - 1));
    }
    
    class UnionFind{
        private int[] par;
        private int[] rank;
        private int[] size;
        private int group;
        
        UnionFind(int n){
            par = new int[n];
            rank = new int[n];
            size = new int[n];
            group = n;
            for(int i = 0; i < n; i++){
                par[i] = i;
                rank[i] = 0;
                size[i] = 1;
            }
        }
        
        //ランクの小さいほうにつなげる
        boolean unite(int x, int y){
            x = root(x);
            y = root(y);
            if(x == y) return false;
            
            if(rank[x] < rank[y]){
                int tmp = x; x = y; y = tmp;
            }
            
            //y(のroot)をx(のroot)の下にくっつける
            //yのほうが重くなる(ポテンシャルが高くなる)
            if(rank[x] == rank[y]) rank[x]++;
            group--;
            par[y] = x;
            size[x] += size[y];
            
            return true;
        }
        
        //経路圧縮しながらrootを求める
        int root(int x){
            if(par[x] == x){
                return x;
            }else{
                int f = root(par[x]);
                return par[x] = f;
            }
        }
        
        int rank(int x){return rank[root(x)];}
        int size(int x){return size[root(x)];}
        int group(){return this.group;}
        boolean isSame(int x, int y){
            return root(x) == root(y);
        }
    }
    
    public static void main(String[] args) {
        new Main().m();
    }
    
    private void m() {
        in = new FastScanner(System.in);
        out = new PrintWriter(System.out);
        /*
        try {
            String path = "input.txt";
            out = new PrintWriter(new BufferedWriter(new FileWriter(new File(path))));
        }catch (IOException e){
            e.printStackTrace();
        }
        */
        solve();
        out.flush();
        in.close();
        out.close();
    }
    
    static class FastScanner {
        private Reader input;
        
        public FastScanner() {this(System.in);}
        public FastScanner(InputStream stream) {this.input = new BufferedReader(new InputStreamReader(stream));}
        public void close() {
            try {
                this.input.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        
        public int nextInt() {
            long nl = nextLong();
            if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
            return (int) nl;
        }
        
        public long nextLong() {
            try {
                int sign = 1;
                int b = input.read();
                while ((b < '0' || '9' < b) && b != '-' && b != '+') {
                    b = input.read();
                }
                if (b == '-') {
                    sign = -1;
                    b = input.read();
                } else if (b == '+') {
                    b = input.read();
                }
                long ret = b - '0';
                while (true) {
                    b = input.read();
                    if (b < '0' || '9' < b) return ret * sign;
                    ret *= 10;
                    ret += b - '0';
                }
            } catch (IOException e) {
                e.printStackTrace();
                return -1;
            }
        }
        
        public double nextDouble() {
            try {
                double sign = 1;
                int b = input.read();
                while ((b < '0' || '9' < b) && b != '-' && b != '+') {
                    b = input.read();
                }
                if (b == '-') {
                    sign = -1;
                    b = input.read();
                } else if (b == '+') {
                    b = input.read();
                }
                double ret = b - '0';
                while (true) {
                    b = input.read();
                    if (b < '0' || '9' < b) break;
                    ret *= 10;
                    ret += b - '0';
                }
                if (b != '.') return sign * ret;
                double div = 1;
                b = input.read();
                while ('0' <= b && b <= '9') {
                    ret *= 10;
                    ret += b - '0';
                    div *= 10;
                    b = input.read();
                }
                return sign * ret / div;
            } catch (IOException e) {
                e.printStackTrace();
                return Double.NaN;
            }
        }
        
        public char nextChar() {
            try {
                int b = input.read();
                while (Character.isWhitespace(b)) {
                    b = input.read();
                }
                return (char) b;
            } catch (IOException e) {
                e.printStackTrace();
                return 0;
            }
        }
        
        public String nextStr() {
            try {
                StringBuilder sb = new StringBuilder();
                int b = input.read();
                while (Character.isWhitespace(b)) {
                    b = input.read();
                }
                while (b != -1 && !Character.isWhitespace(b)) {
                    sb.append((char) b);
                    b = input.read();
                }
                return sb.toString();
            } catch (IOException e) {
                e.printStackTrace();
                return "";
            }
        }
        
        public String nextLine() {
            try {
                StringBuilder sb = new StringBuilder();
                int b = input.read();
                while (b != -1 && b != '\n') {
                    sb.append((char) b);
                    b = input.read();
                }
                return sb.toString();
            } catch (IOException e) {
                e.printStackTrace();
                return "";
            }
        }
        
        public int[] nextIntArray(int n) {
            int[] res = new int[n];
            for (int i = 0; i < n; i++) {
                res[i] = nextInt();
            }
            return res;
        }
        
        public int[] nextIntArrayDec(int n) {
            int[] res = new int[n];
            for (int i = 0; i < n; i++) {
                res[i] = nextInt() - 1;
            }
            return res;
        }
        
        public int[] nextIntArray1Index(int n) {
            int[] res = new int[n + 1];
            for (int i = 0; i < n; i++) {
                res[i + 1] = nextInt();
            }
            return res;
        }
        
        public long[] nextLongArray(int n) {
            long[] res = new long[n];
            for (int i = 0; i < n; i++) {
                res[i] = nextLong();
            }
            return res;
        }
        
        public long[] nextLongArrayDec(int n) {
            long[] res = new long[n];
            for (int i = 0; i < n; i++) {
                res[i] = nextLong() - 1;
            }
            return res;
        }
        
        public long[] nextLongArray1Index(int n) {
            long[] res = new long[n + 1];
            for (int i = 0; i < n; i++) {
                res[i + 1] = nextLong();
            }
            return res;
        }
        
        public double[] nextDoubleArray(int n) {
            double[] res = new double[n];
            for (int i = 0; i < n; i++) {
                res[i] = nextDouble();
            }
            return res;
        }
    }
}
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