// T1313 位数问题 #include <iostream> using namespace std; const int MAXN = 25; bool vis[MAXN][MAXN]; // 默认初始化为 0,代表可以走 long long arr[MAXN][MAXN]; int main() { int n, m; // 横盘的大小 int x, y; // 马所在的坐标 cin >> n >> m >> x >> y; vis[x][y] = true; // 马所在位置是不能走的 // 8 个控制点也不能走 const int controls[8][2] = { {2, 1}, // P1 {1, 2}, // P2 {-1, 2}, // P3 {-2, 1}, // P4 {-2, -1}, // P5 {-1, -2}, // P6 {1, -2}, // P7 {2, -1} // P8 }; for (int i = 0; i < 8; i++) { int nx = x + controls[i][0]; int ny = y + controls[i][1]; if (nx >= 0 && nx <= n && ny >= 0 && ny <= m) { vis[nx][ny] = true; // 计算出的控制点不能走 } } for (int i = 0; i <= n; i ++) { for (int j = 0; j <= m; j++) { if (true == vis[i][j]) { arr[i][j] = 0; // 走到马或控制点所在位置,将路径数清零 } else if (i == 0 || j == 0) { arr[i][j] = 1; } else { // 每个点所在位置的走法只能来自左边一个点或上边一个点 arr[i][j] = arr[i - 1][j] + arr[i][j - 1]; } } } cout << arr[n][m] << endl; return 0; }
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C++ is a widely used middle-level programming language.
When ever you want to perform a set of operations based on a condition If-Else is used.
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You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.
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