因为之前的幽默调试，导致我拿到了#1、2、3的数据，加上运行范例共五组数据调试均无误，扔洛谷里就只剩20分了，不太能理解。下附代码

#include <bits/stdc++.h>
using namespace std;

long long m[30][30];
int x, y, hx, hy;

int judgeH(int x, int y) {
	int temp = abs(x - hx) + abs(y - hy);
	return temp == 0 || temp == 3 && x != hx && y != hy;
}

inline void display() {
	for (int i = 0; i <= x; i++) {
		for (int j = 0; j <= y; j++) {
			printf("%lld ", m[i][j]);
		}
		printf("\n");
	}
	printf("\n");
}

int main() {
	scanf("%d%d%d%d", &x, &y, &hx, &hy);
	x++, y++, hx++, hy++;
	//display();
	
	for (int i = 0; i <= x; i++) {
		for (int j = 0; j <= y; j++) {
			if (judgeH(i, j)) continue;
			else if (i == 1 && j == 1) m[i][j] = 1;
			else m[i][j] = m[i - 1][j] + m[i][j - 1];
		}
		//display();
	}
	//display();
	
	printf("%lld", m[x][y]);
	
	return 0;
}