diff --git a/S2OJ/1385/1385.cpp b/S2OJ/1385/1385.cpp new file mode 100644 index 00000000..cd612c02 --- /dev/null +++ b/S2OJ/1385/1385.cpp @@ -0,0 +1,103 @@ +#include +#include +#include +#include +#include + +using std::cin; +using std::cout; +const char endl = '\n'; + +void solve() { + std::vector st(3), ed(3); + std::string s; + + for (int i = 0; i < 3; i++) { + std::string t; + + cin >> t; + + st[i] = s.size(); + s += t; + ed[i] = s.size() - 1; + } + + std::function id = [&](int x) -> int { + return std::distance(std::begin(ed), std::lower_bound(std::begin(ed), std::end(ed), x)); + }; + + int n = s.size(); + std::vector> + f(n, std::vector(n)), + g(3, std::vector(n)), + h(3, std::vector(n)); + long long w = 0, ans = 0; + + for (int i = 0; i < n; i++) { + for (int j = n - 1; j > i; j--) { + if (s[i] != s[j]) continue; + + int id_i = id(i), + id_j = id(j); + + if (id_i == 0 && id_j == 2) { + f[i][j] = 1; + } + + f[i][j] += g[id_j][i]; // 加上右边块的贡献 + f[i][j] += h[id_i][j]; // 加上左边块的贡献 + + if (id_i == 1 && id_j == 1) { + f[i][j] += w; // 加上两边来的贡献 + } + + if (i != st[id_i] && j != ed[id_j]) { + f[i][j] += f[i - 1][j + 1]; // 还在块内，不跳到下一块 + } + + if (id_i == 0 && id_j == 2) { + w += f[i][j]; // 如果在两边的块，更新贡献 + } + + if (id_j != 0 && i != ed[id_i]) { + g[id_j - 1][i + 1] += f[i][j]; // 更新到左边块的贡献 + } + + if (id_i != 2 && j != st[id_j]) { + h[id_i + 1][j - 1] += f[i][j]; // 更新到右边块的贡献 + } + + if (id_i == id_j) { + if (j - i + 1 <= 3) { + // j - i + 1 == 2: i, j 相邻，总长度为偶数 + // == 3: i, j 之间还有一个字符，总长度为奇数 + ans += f[i][j]; + } + } else if (id_i + 1 == id_j) { // i 和 j 在相邻块中 + ans += static_cast( + 1 // i, j 之间不拼字符，总长度为偶数 + + (i != ed[id_i]) // 如果 i 不是块末尾，还可以在中间拼一个字符，总长度为奇数 + + (j != st[id_j]) // 如果 j 不是块开头，还可以在中间拼一个字符，总长度为奇数 + ) + * f[i][j]; + } + } + } + + ans += w * (ed[1] - st[1] + 1); + + cout << ans << endl; +} + +int main() { + std::ios::sync_with_stdio(false); + cin.tie(nullptr); + + int t; + + cin >> t; + + while (t--) solve(); + + return 0; +} diff --git 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