#include<iostream>
#include<iomanip>
#include<cstring>
#include<string>
using namespace std;
long long map[40][40];
void f(int a,int b)
{
	if (map[a][b - 1] != -1)
	{
		map[a][b - 1] = map[a][b];
		if (map[a + 1][b - 1] != -1)
		{
			map[a][b - 1] += map[a + 1][b - 1];
		}
		f(a,b - 1);
	}
	if (map[a - 1][b] != -1)
	{
		map[a - 1][b] = map[a][b];
		if (map[a - 1][b + 1] != -1)
		{
			map[a - 1][b] += map[a - 1][b + 1];
		}
		f(a - 1,b);
	}
}
int main()
{
	int n1,n2,m1,m2;
	cin >> n1 >> n2 >> m1 >> m2;
	n1 += 10;
	n2 += 10;
	m1 += 10;
	m2 += 10;
	map[n1][n2] = 1;
	for (int i = 9;i < 40;i++)
	{
		map[i][9] = -1;
	}
	for (int i = 9;i < 40;i++)
	{
		map[9][i] = -1;
	}
	map[m1][m2] = -1;
	map[m1 - 1][m2 - 2] = -1;
	map[m1 + 1][m2 - 2] = -1;
	map[m1 + 2][m2 - 1] = -1;
	map[m1 + 2][m2 + 1] = -1;
	map[m1 + 1][m2 + 2] = -1;
	map[m1 - 1][m2 + 2] = -1;
	map[m1 - 2][m2 + 1] = -1;
	map[m1 - 2][m2 - 1] = -1;
	f(n1,n2);
	printf("%d",map[10][10]);
	return 0;
} 

第345个点TLE了，求助。 不太会发帖子啊，第一次求助，如若礼节不周，还请海涵。