27 lines
836 B
C++
27 lines
836 B
C++
#include <bits/stdc++.h>
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using namespace std;
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const int N = 25;
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typedef long long LL;
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LL f[N][N][N];
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LL w(LL a, LL b, LL c) {
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//注意判断的顺序，防止数组下标越界出现RE错误
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if (a <= 0 || b <= 0 || c <= 0) return 1;
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else if (a > 20 || b > 20 || c > 20) return w(20, 20, 20);
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else if (f[a][b][c]) return f[a][b][c];
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else if (a < b && b < c) f[a][b][c] = w(a, b, c - 1) + w(a, b - 1, c - 1) - w(a, b - 1, c);
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else f[a][b][c] = w(a - 1, b, c) + w(a - 1, b - 1, c) + w(a - 1, b, c - 1) - w(a - 1, b - 1, c - 1);
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return f[a][b][c];
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}
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int main() {
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LL a, b, c;
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while (cin >> a >> b >> c) {
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if (a == -1 && b == -1 && c == -1) break;
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cout << "w(" << a << ", " << b << ", " << c << ") = ";
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cout << w(a, b, c) << endl;
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}
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return 0;
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} |