diff --git a/LibreOJ/2360/2360.cpp b/LibreOJ/2360/2360.cpp new file mode 100644 index 00000000..f6e87f90 --- /dev/null +++ b/LibreOJ/2360/2360.cpp @@ -0,0 +1,92 @@ +#include +#include +#include +#include + +using std::cin; +using std::cout; +const char endl = '\n'; + +const int N = 2005, + V = 305; + +int n, m, v, e, c[N], d[N], g[V][V]; +double p[N], f[N][N][2], ans = 1e9; + +int main() { + std::ios::sync_with_stdio(false); + cin.tie(nullptr); + + cin >> n >> m >> v >> e; + + memset(g, 0x3f, sizeof(g)); + + for (int i = 1; i <= n; i++) { + cin >> c[i]; + } + + for (int i = 1; i <= n; i++) { + cin >> d[i]; + } + + for (int i = 1; i <= n; i++) { + cin >> p[i]; + } + + for (int i = 1; i <= v; i++) { + g[i][i] = 0; + } + + for (int i = 1, a, b, w; i <= e; i++) { + cin >> a >> b >> w; + + g[a][b] = g[b][a] = std::min(g[a][b], w); + } + + for (int k = 1; k <= v; k++) { + for (int i = 1; i <= v; i++) { + for (int j = 1; j <= v; j++) { + g[i][j] = std::min(g[i][j], g[i][k] + g[k][j]); + } + } + } + + for (int i = 1; i <= n; i++) { + for (int j = 0; j <= m; j++) { + f[i][j][0] = f[i][j][1] = 1e9; + } + } + + f[1][0][0] = f[1][1][1] = 0; + + for (int i = 2; i <= n; i++) { + for (int j = 0; j <= std::min(m, i); j++) { + f[i][j][0] = std::min( + f[i - 1][j][0] + + g[c[i - 1]][c[i]], + f[i - 1][j][1] + + p[i - 1] * g[d[i - 1]][c[i]] + + (1.0 - p[i - 1]) * g[c[i - 1]][c[i]]); + + if (j) { + f[i][j][1] = std::min( + f[i - 1][j - 1][0] + + p[i] * g[c[i - 1]][d[i]] + + (1.0 - p[i]) * g[c[i - 1]][c[i]], + f[i - 1][j - 1][1] + + p[i - 1] * p[i] * g[d[i - 1]][d[i]] + + (1.0 - p[i - 1]) * p[i] * g[c[i - 1]][d[i]] + + p[i - 1] * (1.0 - p[i]) * g[d[i - 1]][c[i]] + + (1.0 - p[i - 1]) * (1.0 - p[i]) * g[c[i - 1]][c[i]]); + } + } + } + + for (int i = 0; i <= m; i++) { + ans = std::min({ans, f[n][i][0], f[n][i][1]}); + } + + cout << std::fixed << std::setprecision(2) << ans << endl; + + return 0; +} diff --git a/LibreOJ/2360/data/classroom1.ans b/LibreOJ/2360/data/classroom1.ans new file mode 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