結果

問題 No.321 (P,Q)-サンタと街の子供たち
ユーザー ぴろず
提出日時 2015-12-17 22:32:24
言語 Java
(openjdk 23)
結果
AC  
実行時間 138 ms / 2,000 ms
コード長 4,593 bytes
コンパイル時間 2,416 ms
コンパイル使用メモリ 78,104 KB
実行使用メモリ 39,428 KB
最終ジャッジ日時 2024-07-06 22:06:34
合計ジャッジ時間 7,983 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge4
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 4
other AC * 41
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

package no321;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.InputMismatchException;
import java.util.NoSuchElementException;
public class Main {
    public static void main(String[] args) {
        IO io = new IO();
        int p = io.nextInt();
        int q = io.nextInt();
        int n = io.nextInt();
        int ans = 0;
        for(int i=0;i<n;i++) {
            int x = io.nextInt();
            int y = io.nextInt();
            if (hasSolution(p,q,x,y)) {
                ans++;
            }
        }
        System.out.println(ans);
    }
    
    //解説を読んだ
    public static boolean hasSolution(long p,long q,long x,long y) {
        if (p == 0 && q == 0) {
            return x == 0 && y == 0;
        }
        if (p == 0) {
            return x % q == 0 && y % q == 0;
        }
        if (q == 0) {
            return x % p == 0 && y % p == 0;
        }
        long gcd = gcd(p,q);
        if (x % gcd != 0 || y % gcd != 0) {
            return false;
        }
        p /= gcd;
        q /= gcd;
        x = x / gcd;
        y = y / gcd;
        if ((p + q) % 2 == 1) {
            return true;
        }else{
            return (x + y) % 2 == 0;
        }
    }
    
    public static long gcd(long a,long b) {
        while(b!=0) {
            long r = a%b;
            a = b;
            b = r;
        }
        return a;
    }
}
class IO extends PrintWriter {
    private final InputStream in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    
    public IO() { this(System.in);}
    public IO(InputStream source) { super(System.out); this.in = source;}
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        }else{
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
    private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
    private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    private static boolean isNewLine(int c) { return c == '\n' || c == '\r';}
    public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; return hasNextByte();}
    public boolean hasNextLine() { while(hasNextByte() && isNewLine(buffer[ptr])) ptr++; return hasNextByte();}
    public String next() {
        if (!hasNext()) {
            throw new NoSuchElementException();
        }
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public char[] nextCharArray(int len) {
        if (!hasNext()) {
            throw new NoSuchElementException();
        }
        char[] s = new char[len];
        int i = 0;
        int b = readByte();
        while(isPrintableChar(b)) {
            if (i == len) {
                throw new InputMismatchException();
            }
            s[i++] = (char) b;
            b = readByte();
        }
        return s;
    }
    public String nextLine() {
        if (!hasNextLine()) {
            throw new NoSuchElementException();
        }
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(!isNewLine(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public long nextLong() {
        if (!hasNext()) {
            throw new NoSuchElementException();
        }
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) {
            throw new NumberFormatException();
        }
        return (int) nl;
    }
    public char nextChar() {
        if (!hasNext()) {
            throw new NoSuchElementException();
        }
        return (char) readByte();
    }
    public double nextDouble() { return Double.parseDouble(next());}
    public int[] nextIntArray(int n) { int[] a = new int[n]; for(int i=0;i<n;i++) a[i] = nextInt(); return a;}
    public long[] nextLongArray(int n) { long[] a = new long[n]; for(int i=0;i<n;i++) a[i] = nextLong(); return a;}
    public double[] nextDoubleArray(int n) { double[] a = new double[n]; for(int i=0;i<n;i++) a[i] = nextDouble(); return a;}
    public void nextIntArrays(int[]... a) { for(int i=0;i<a[0].length;i++) for(int j=0;j<a.length;j++) a[j][i] = nextInt();}
    public int[][] nextIntMatrix(int n,int m) { int[][] a = new int[n][]; for(int i=0;i<n;i++) a[i] = nextIntArray(m); return a;}
    public char[][] nextCharMap(int n,int m) { char[][] a = new char[n][]; for(int i=0;i<n;i++) a[i] = nextCharArray(m); return a;}
    public void close() { super.close(); try {in.close();} catch (IOException e) {}}
}
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