結果

問題 No.2202 贅沢てりたまチキン
ユーザー lmxyue
提出日時 2025-08-25 14:12:45
言語 Java
(openjdk 23)
結果
AC  
実行時間 185 ms / 2,000 ms
コード長 21,423 bytes
コンパイル時間 5,611 ms
コンパイル使用メモリ 91,264 KB
実行使用メモリ 50,276 KB
最終ジャッジ日時 2025-08-25 14:12:56
合計ジャッジ時間 10,127 ms
ジャッジサーバーID
(参考情報)
judge3 / judge5
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
other AC * 28
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 #

package contest230203;
import java.io.*;
import java.util.ArrayDeque;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.Queue;
import java.util.function.IntUnaryOperator;
import java.util.function.LongUnaryOperator;

public class B {
        InputStream is;
        FastWriter out;

        String INPUT = "";

        public void solve()
        {
                int n = ni(), m = ni();
                DJSet ds = new DJSet(2*n);
                for(int i = 0;i < m;i++){
                        int a = ni()-1, b = ni()-1;
                        ds.unite(a, b+n);
                        ds.unite(a+n, b);
                }
                for(int i = 0;i < n;i++){
                        if(!ds.equiv(i, i+n)){
                                out.println("No");
                                return;
                        }
                }
                out.println("Yes");
        }

        public static class DJSet {
                public int[] upper;

                public DJSet(int n) {
                        upper = new int[n];
                        Arrays.fill(upper, -1);
                }

                public int root(int x) {
                        return upper[x] < 0 ? x : (upper[x] = root(upper[x]));
                }

                public boolean equiv(int x, int y) {
                        return root(x) == root(y);
                }

                public boolean unite(int x, int y) {
                        x = root(x);
                        y = root(y);
                        if (x != y) {
                                if (upper[y] < upper[x]) {
                                        int d = x;
                                        x = y;
                                        y = d;
                                }
                                upper[x] += upper[y];
                                upper[y] = x;
                        }
                        return x == y;
                }

                public int count() {
                        int ct = 0;
                        for (int u : upper) if (u < 0) ct++;
                        return ct;
                }

                public int[][] toBucket() {
                        int n = upper.length;
                        int[][] ret = new int[n][];
                        int[] rp = new int[n];
                        for (int i = 0; i < n; i++) if (upper[i] < 0) ret[i] = new int[-upper[i]];
                        for (int i = 0; i < n; i++) {
                                int r = root(i);
                                ret[r][rp[r]++] = i;
                        }
                        return ret;
                }
        }


        public static void main(String[] args) {
                new B().run();
        }

        public void run()
        {
                long S = System.currentTimeMillis();
                is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
                out = new FastWriter(System.out);

                solve();
                out.flush();
                long G = System.currentTimeMillis();
                tr(G-S+"ms");
                //                Thread t = new Thread(null, null, "~", Runtime.getRuntime().maxMemory()){
                //                        @Override
                //                        public void run() {
                //                                long s = System.currentTimeMillis();
                //                                solve();
                //                                out.flush();
                //                                if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
                //                        }
                //                };
                //                t.start();
                //                t.join();
        }

        private boolean eof()
        {
                if(lenbuf == -1)return true;
                int lptr = ptrbuf;
                while(lptr < lenbuf)if(!isSpaceChar(inbuf[lptr++]))return false;

                try {
                        is.mark(1000);
                        while(true){
                                int b = is.read();
                                if(b == -1){
                                        is.reset();
                                        return true;
                                }else if(!isSpaceChar(b)){
                                        is.reset();
                                        return false;
                                }
                        }
                } catch (IOException e) {
                        return true;
                }
        }

        private final byte[] inbuf = new byte[1024];
        public int lenbuf = 0, ptrbuf = 0;

        private int readByte()
        {
                if(lenbuf == -1)throw new InputMismatchException();
                if(ptrbuf >= lenbuf){
                        ptrbuf = 0;
                        try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
                        if(lenbuf <= 0)return -1;
                }
                return inbuf[ptrbuf++];
        }

        private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
        //        private boolean isSpaceChar(int c) { return !(c >= 32 && c <= 126); }
        private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }

        private double nd() { return Double.parseDouble(ns()); }
        private char nc() { return (char)skip(); }

        private String ns()
        {
                int b = skip();
                StringBuilder sb = new StringBuilder();
                while(!(isSpaceChar(b))){
                        sb.appendCodePoint(b);
                        b = readByte();
                }
                return sb.toString();
        }

        private char[] ns(int n)
        {
                char[] buf = new char[n];
                int b = skip(), p = 0;
                while(p < n && !(isSpaceChar(b))){
                        buf[p++] = (char)b;
                        b = readByte();
                }
                return n == p ? buf : Arrays.copyOf(buf, p);
        }

        private char[][] nm(int n, int m)
        {
                char[][] map = new char[n][];
                for(int i = 0;i < n;i++)map[i] = ns(m);
                return map;
        }

        private int[][] nmi(int n, int m)
        {
                int[][] map = new int[n][];
                for(int i = 0;i < n;i++)map[i] = na(m);
                return map;
        }

        private int[] na(int n)
        {
                int[] a = new int[n];
                for(int i = 0;i < n;i++)a[i] = ni();
                return a;
        }

        private long[] nal(int n)
        {
                long[] a = new long[n];
                for(int i = 0;i < n;i++)a[i] = nl();
                return a;
        }

        private int ni()
        {
                int num = 0, b;
                boolean minus = false;
                while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
                if(b == '-'){
                        minus = true;
                        b = readByte();
                }

                while(true){
                        if(b >= '0' && b <= '9'){
                                num = num * 10 + (b - '0');
                        }else{
                                return minus ? -num : num;
                        }
                        b = readByte();
                }
        }

        private long nl()
        {
                long num = 0;
                int b;
                boolean minus = false;
                while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
                if(b == '-'){
                        minus = true;
                        b = readByte();
                }

                while(true){
                        if(b >= '0' && b <= '9'){
                                num = num * 10 + (b - '0');
                        }else{
                                return minus ? -num : num;
                        }
                        b = readByte();
                }
        }

        public static class FastWriter
        {
                private static final int BUF_SIZE = 1<<13;
                private final byte[] buf = new byte[BUF_SIZE];
                private final OutputStream out;
                private int ptr = 0;

                private FastWriter(){out = null;}

                public FastWriter(OutputStream os)
                {
                        this.out = os;
                }

                public FastWriter(String path)
                {
                        try {
                                this.out = new FileOutputStream(path);
                        } catch (FileNotFoundException e) {
                                throw new RuntimeException("FastWriter");
                        }
                }

                public FastWriter write(byte b)
                {
                        buf[ptr++] = b;
                        if(ptr == BUF_SIZE)innerflush();
                        return this;
                }

                public FastWriter write(char c)
                {
                        return write((byte)c);
                }

                public FastWriter write(char[] s)
                {
                        for(char c : s){
                                buf[ptr++] = (byte)c;
                                if(ptr == BUF_SIZE)innerflush();
                        }
                        return this;
                }

                public FastWriter write(String s)
                {
                        s.chars().forEach(c -> {
                                buf[ptr++] = (byte)c;
                                if(ptr == BUF_SIZE)innerflush();
                        });
                        return this;
                }

                private static int countDigits(int l) {
                        if (l >= 1000000000) return 10;
                        if (l >= 100000000) return 9;
                        if (l >= 10000000) return 8;
                        if (l >= 1000000) return 7;
                        if (l >= 100000) return 6;
                        if (l >= 10000) return 5;
                        if (l >= 1000) return 4;
                        if (l >= 100) return 3;
                        if (l >= 10) return 2;
                        return 1;
                }

                public FastWriter write(int x)
                {
                        if(x == Integer.MIN_VALUE){
                                return write((long)x);
                        }
                        if(ptr + 12 >= BUF_SIZE)innerflush();
                        if(x < 0){
                                write((byte)'-');
                                x = -x;
                        }
                        int d = countDigits(x);
                        for(int i = ptr + d - 1;i >= ptr;i--){
                                buf[i] = (byte)('0'+x%10);
                                x /= 10;
                        }
                        ptr += d;
                        return this;
                }

                private static int countDigits(long l) {
                        if (l >= 1000000000000000000L) return 19;
                        if (l >= 100000000000000000L) return 18;
                        if (l >= 10000000000000000L) return 17;
                        if (l >= 1000000000000000L) return 16;
                        if (l >= 100000000000000L) return 15;
                        if (l >= 10000000000000L) return 14;
                        if (l >= 1000000000000L) return 13;
                        if (l >= 100000000000L) return 12;
                        if (l >= 10000000000L) return 11;
                        if (l >= 1000000000L) return 10;
                        if (l >= 100000000L) return 9;
                        if (l >= 10000000L) return 8;
                        if (l >= 1000000L) return 7;
                        if (l >= 100000L) return 6;
                        if (l >= 10000L) return 5;
                        if (l >= 1000L) return 4;
                        if (l >= 100L) return 3;
                        if (l >= 10L) return 2;
                        return 1;
                }

                public FastWriter write(long x)
                {
                        if(x == Long.MIN_VALUE){
                                return write("" + x);
                        }
                        if(ptr + 21 >= BUF_SIZE)innerflush();
                        if(x < 0){
                                write((byte)'-');
                                x = -x;
                        }
                        int d = countDigits(x);
                        for(int i = ptr + d - 1;i >= ptr;i--){
                                buf[i] = (byte)('0'+x%10);
                                x /= 10;
                        }
                        ptr += d;
                        return this;
                }

                public FastWriter write(double x, int precision)
                {
                        if(x < 0){
                                write('-');
                                x = -x;
                        }
                        x += Math.pow(10, -precision)/2;
                        //                if(x < 0){ x = 0; }
                        write((long)x).write(".");
                        x -= (long)x;
                        for(int i = 0;i < precision;i++){
                                x *= 10;
                                write((char)('0'+(int)x));
                                x -= (int)x;
                        }
                        return this;
                }

                public FastWriter writeln(char c){ return write(c).writeln(); }
                public FastWriter writeln(int x){ return write(x).writeln(); }
                public FastWriter writeln(long x){ return write(x).writeln(); }
                public FastWriter writeln(double x, int precision){ return write(x, precision).writeln(); }

                public FastWriter write(int... xs)
                {
                        boolean first = true;
                        for(int x : xs) {
                                if (!first) write(' ');
                                first = false;
                                write(x);
                        }
                        return this;
                }

                public FastWriter write(long... xs)
                {
                        boolean first = true;
                        for(long x : xs) {
                                if (!first) write(' ');
                                first = false;
                                write(x);
                        }
                        return this;
                }

                public FastWriter write(IntUnaryOperator f, int... xs)
                {
                        boolean first = true;
                        for(int x : xs) {
                                if (!first) write(' ');
                                first = false;
                                write(f.applyAsInt(x));
                        }
                        return this;
                }

                public FastWriter write(LongUnaryOperator f, long... xs)
                {
                        boolean first = true;
                        for(long x : xs) {
                                if (!first) write(' ');
                                first = false;
                                write(f.applyAsLong(x));
                        }
                        return this;
                }

                public FastWriter writeln()
                {
                        return write((byte)'\n');
                }

                public FastWriter writeln(int... xs) { return write(xs).writeln(); }
                public FastWriter writeln(long... xs) { return write(xs).writeln(); }
                public FastWriter writeln(IntUnaryOperator f, int... xs) { return write(f, xs).writeln(); }
                public FastWriter writeln(LongUnaryOperator f, long... xs) { return write(f, xs).writeln(); }
                public FastWriter writeln(char[] line) { return write(line).writeln(); }
                public FastWriter writeln(char[]... map) { for(char[] line : map)write(line).writeln();return this; }
                public FastWriter writeln(String s) { return write(s).writeln(); }

                private void innerflush()
                {
                        try {
                                out.write(buf, 0, ptr);
                                ptr = 0;
                        } catch (IOException e) {
                                throw new RuntimeException("innerflush");
                        }
                }

                public void flush()
                {
                        innerflush();
                        try {
                                out.flush();
                        } catch (IOException e) {
                                throw new RuntimeException("flush");
                        }
                }

                public FastWriter print(byte b) { return write(b); }
                public FastWriter print(char c) { return write(c); }
                public FastWriter print(char[] s) { return write(s); }
                public FastWriter print(String s) { return write(s); }
                public FastWriter print(int x) { return write(x); }
                public FastWriter print(long x) { return write(x); }
                public FastWriter print(double x, int precision) { return write(x, precision); }
                public FastWriter println(char c){ return writeln(c); }
                public FastWriter println(int x){ return writeln(x); }
                public FastWriter println(long x){ return writeln(x); }
                public FastWriter println(double x, int precision){ return writeln(x, precision); }
                public FastWriter print(int... xs) { return write(xs); }
                public FastWriter print(long... xs) { return write(xs); }
                public FastWriter print(IntUnaryOperator f, int... xs) { return write(f, xs); }
                public FastWriter print(LongUnaryOperator f, long... xs) { return write(f, xs); }
                public FastWriter println(int... xs) { return writeln(xs); }
                public FastWriter println(long... xs) { return writeln(xs); }
                public FastWriter println(IntUnaryOperator f, int... xs) { return writeln(f, xs); }
                public FastWriter println(LongUnaryOperator f, long... xs) { return writeln(f, xs); }
                public FastWriter println(char[] line) { return writeln(line); }
                public FastWriter println(char[]... map) { return writeln(map); }
                public FastWriter println(String s) { return writeln(s); }
                public FastWriter println() { return writeln(); }
        }

        public static void trnz(int... o)
        {
                for(int i = 0;i < o.length;i++)if(o[i] != 0)System.out.print(i+":"+o[i]+" ");
                System.out.println();
        }

        // print ids which are 1
        public static void trt(long... o)
        {
                Queue<Integer> stands = new ArrayDeque<>();
                for(int i = 0;i < o.length;i++){
                        for(long x = o[i];x != 0;x &= x-1)stands.add(i<<6|Long.numberOfTrailingZeros(x));
                }
                System.out.println(stands);
        }

        public static void tf(boolean... r)
        {
                for(boolean x : r)System.out.print(x?'#':'.');
                System.out.println();
        }

        public static void tf(boolean[]... b)
        {
                for(boolean[] r : b) {
                        for(boolean x : r)System.out.print(x?'#':'.');
                        System.out.println();
                }
                System.out.println();
        }

        public void tf(long[]... b)
        {
                if(INPUT.length() != 0) {
                        for (long[] r : b) {
                                for (long x : r) {
                                        for (int i = 0; i < 64; i++) {
                                                System.out.print(x << ~i < 0 ? '#' : '.');
                                        }
                                }
                                System.out.println();
                        }
                        System.out.println();
                }
        }

        public void tf(long... b)
        {
                if(INPUT.length() != 0) {
                        for (long x : b) {
                                for (int i = 0; i < 64; i++) {
                                        System.out.print(x << ~i < 0 ? '#' : '.');
                                }
                        }
                        System.out.println();
                }
        }

        private void tr(Object... o) { if(INPUT.length() != 0)System.out.println(Arrays.deepToString(o)); }
}
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