48 lines
974 B
C++
48 lines
974 B
C++
#include <bits/stdc++.h>
|
||
|
||
using namespace std;
|
||
const int N = 22;
|
||
int ctrl[N][N];
|
||
int n, m;
|
||
int mx, my;
|
||
|
||
//深搜
|
||
int dfs(int x, int y) {
|
||
//终点
|
||
if (x == n && y == m) return 1;
|
||
//不能走
|
||
if (ctrl[x][y] || x > n || y > m) return 0;
|
||
//向右 向下
|
||
return dfs(x + 1, y) + dfs(x, y + 1);
|
||
}
|
||
|
||
|
||
//增量数组，delta
|
||
int d[8][2] = {
|
||
{1, 2},
|
||
{1, -2},
|
||
{-1, 2},
|
||
{-1, -2},
|
||
{2, 1},
|
||
{2, -1},
|
||
{-2, 1},
|
||
{-2, -1}};
|
||
|
||
int main() {
|
||
//读入B点坐标和马的坐标
|
||
cin >> n >> m >> mx >> my;
|
||
//马的实际控制范围
|
||
for (int i = 0; i < 8; i++) {
|
||
int tx = mx + d[i][0], ty = my + d[i][1];
|
||
if (tx >= 0 && tx <= n && ty >= 0 && ty <= m) ctrl[tx][ty] = 1;
|
||
}
|
||
//马所在的位置你也不能走，也踢你~
|
||
ctrl[mx][my] = 1;
|
||
|
||
//深搜
|
||
int sum = dfs(0, 0);
|
||
|
||
//输出
|
||
printf("%d\n", sum);
|
||
}
|