diff --git a/LibreOJ/2619/2619.cpp b/LibreOJ/2619/2619.cpp new file mode 100644 index 00000000..250a84f0 --- /dev/null +++ b/LibreOJ/2619/2619.cpp @@ -0,0 +1,56 @@ +#include +#include +#include +#include + +using std::cin; +using std::cout; +const char endl = '\n'; + +const int N = 15; +const double eps = 1e-6; + +int n; +double a[N][N], b[N][N]; + +int main() { + std::ios::sync_with_stdio(false); + + cin >> n; + + for (int i = 1; i <= n + 1; i++) { + for (int j = 1; j <= n; j++) { + cin >> a[i][j]; + } + } + + for (int i = 1; i <= n; i++) { + for (int j = 1; j <= n; j++) { + b[i][j] = 2.0 * (a[i][j] - a[i + 1][j]); + b[i][n + 1] += std::pow(a[i][j], 2) - std::pow(a[i + 1][j], 2); + } + } + + for (int i = 1; i <= n; i++) { + for (int j = i; j <= n; j++) { + if (std::abs(b[j][i]) > eps) { + std::swap(b[i], b[j]); + } + } + + for (int j = 1; j <= n; j++) { + if (i == j) continue; + double x = b[j][i] / b[i][i]; + for (int k = i; k <= n + 1; k++) { + b[j][k] -= b[i][k] * x; + } + } + } + + for (int i = 1; i <= n; i++) { + cout << std::fixed << std::setprecision(3) << b[i][n + 1] / b[i][i] << ' '; + } + cout << endl; + + return 0; +} diff --git a/LibreOJ/2619/data/1.in b/LibreOJ/2619/data/1.in new file mode 100644 index 00000000..f132f159 --- /dev/null +++ b/LibreOJ/2619/data/1.in @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:c53ba6094cfd785934796e254e7f8400b4e0ed4e43e29bd35bd26ddbe0787799 +size 873 diff --git a/LibreOJ/2619/data/1.out b/LibreOJ/2619/data/1.out new file mode 100644 index 00000000..5a4d5534 --- /dev/null +++ b/LibreOJ/2619/data/1.out @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:924429656bc1740ff62163370da307d7086ab6ac3b95fa6b8e08a5b81f3269e8 +size 72 diff --git a/LibreOJ/2619/data/10.in b/LibreOJ/2619/data/10.in new file mode 100644 index 00000000..d97e12b1 --- /dev/null +++ b/LibreOJ/2619/data/10.in @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid 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