深搜竟然过了=.=!
#include <iostream> #include <stdio.h> #include <cstring> #include <string> #include <algorithm> #include <cmath> #include <set> using namespace std; typedef long long ll; //int DP[21][21] = { 1 }; bool vis[21][21]; int nx, ny, fx, fy; int tot; int dx[2] = { 0,1 }; int dy[2] = { 1,0 }; void Vis(int x, int y){ vis[x][y] = true; vis[x - 1][y - 2] = true; vis[x - 2][y - 1] = true; vis[x - 2][y + 1] = true; vis[x - 1][y + 2] = true; vis[x + 1][y - 2] = true; vis[x + 2][y - 1] = true; vis[x + 2][y + 1] = true; vis[x + 1][y + 2] = true; } void dfs(int x, int y){ if (x == nx && y == ny) { tot++; return; } for (int i = 0; i < 2; i++) { int fx = x + dx[i]; int fy = y + dy[i]; if (!vis[fx][fy] && fx <= nx && fy <= ny) { vis[fx][fy] = true; dfs(fx, fy); vis[fx][fy] = false; } } } int main() { cin >> nx >> ny >> fx >> fy; Vis(fx, fy); dfs(0, 0); cout << tot << endl; return 0; }
另外附上DP的代码
#include <iostream> #include <stdio.h> #include <cstring> #include <string> #include <algorithm> #include <cmath> #include <set> using namespace std; typedef long long ll; ll DP[23][23] = { 1 }; bool vis[23][23]; int nx, ny, fx, fy; void Vis(int x, int y) { vis[0][0] = true; vis[x][y] = true; if (x - 1 >= 0 && y - 2 >= 0) vis[x - 1][y - 2] = true; if (x - 2 >= 0 && y - 1 >= 0) vis[x - 2][y - 1] = true; if (x - 2 >= 0 && y + 1 <= ny) vis[x - 2][y + 1] = true; if (x - 1 >= 0 && y + 2 <= ny) vis[x - 1][y + 2] = true; if (x + 1 <= nx && y - 2 >= 0) vis[x + 1][y - 2] = true; if (x + 2 <= nx && y - 1 >= 0) vis[x + 2][y - 1] = true; if (x + 2 <= nx && y + 1 <= ny) vis[x + 2][y + 1] = true; if (x + 1 <= nx && y + 2 <= ny) vis[x + 1][y + 2] = true; } int main() { cin >> nx >> ny >> fx >> fy; Vis(fx, fy); for(int i=0;i<=nx;i++) for (int j = 0; j <= ny; j++) { if (!vis[i][j]) { DP[i][j] = DP[i == 0 ? i : i - 1][j] + DP[i][j == 0 ? j : j - 1]; } } cout << DP[nx][ny] << endl; return 0; }
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