Submission #122974

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Source Code Expand

import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Scanner;

public class Main {

	Scanner sc = new Scanner(System.in);
	public void run() {
		int r = sc.nextInt();
		int c = sc.nextInt();
		int x = sc.nextInt();
		int y = sc.nextInt();
		int d = sc.nextInt();
		int l = sc.nextInt();
		calc(r, c, x, y, d, l);
	}
	public void calc(int r, int c, int x, int y, int d, int l) {
		BigInteger c1 = keisan(BigInteger.valueOf(x * y), BigInteger.valueOf(x*y - d - l));
		BigInteger c2 = keisan(BigInteger.valueOf(x*y - y), BigInteger.valueOf(x*y-y-d-l));
		BigInteger c3 = keisan(BigInteger.valueOf(x*y-x), BigInteger.valueOf(x*y-x-d-l));
		BigInteger c4 = keisan(BigInteger.valueOf(x*y-x-y+1), BigInteger.valueOf(x*y-x-y+1-d-l));
		
		BigInteger dd = kaijou(d);
		BigInteger ll = kaijou(l);
		
		BigInteger a1 = c1.subtract(c2);
		a1 = a1.subtract(c3);
		a1 = a1.subtract(c4);
		a1 = a1.divide(dd).divide(ll);
		
		BigInteger kk = BigInteger.valueOf(r-x+1).multiply(BigInteger.valueOf(c-y+1));
		
		a1 = a1.multiply(kk);
		
		System.out.println(a1.remainder(chousei));
	}
	BigInteger chousei = new BigInteger("1000000007");
	public BigInteger keisan(BigInteger t1, BigInteger t2){
		BigInteger ans = new BigInteger("1");
		while(t1.compareTo(t2) > 0){
			ans = ans.multiply(t1);
			t1 = t1.subtract(new BigInteger("1"));
		}
		return ans;
	}

	public BigInteger kaijou(int k){
		BigInteger ans = new BigInteger("1");
		while(k > 0){
			ans = ans.multiply(BigInteger.valueOf(k));
			k = k -1;
		}
		return ans;
	}
	
	public static void main(String[] args) {
		new Main().run();
	}
}

Submission Info

Judge Result