diff --git a/BZOJ/1827/1827.cpp b/BZOJ/1827/1827.cpp new file mode 100644 index 00000000..b6bed22d --- /dev/null +++ b/BZOJ/1827/1827.cpp @@ -0,0 +1,81 @@ +#include +#include + +using std::cin; +using std::cout; +const char endl = '\n'; + +const int N = 1e5 + 5; + +int n, sum, root, c[N], siz[N], max_siz[N], dep[N]; +long long ans; +std::vector> g[N]; + +void dfs1(int u, int f) { + siz[u] = c[u]; + + for (auto e : g[u]) { + int v = e.first, + w = e.second; + + if (v == f) continue; + + dfs1(v, u); + + siz[u] += siz[v]; + max_siz[u] = std::max(max_siz[u], siz[v]); + } + + max_siz[u] = std::max(max_siz[u], sum - siz[u]); +} + +void dfs2(int u, int f) { + for (auto e : g[u]) { + int v = e.first, + w = e.second; + + if (v == f) continue; + + dep[v] = dep[u] + w; + dfs2(v, u); + } +} + +int main() { + std::ios::sync_with_stdio(false); + cin.tie(nullptr); + + cin >> n; + + for (int i = 1; i <= n; i++) { + cin >> c[i]; + + sum += c[i]; + } + + for (int i = 1, u, v, w; i <= n; i++) { + cin >> u >> v >> w; + + g[u].emplace_back(v, w); + g[v].emplace_back(u, w); + } + + dfs1(1, 0); + + for (int i = 1; i <= n; i++) { + if (!root || max_siz[i] < max_siz[root]) { + root = i; + } + } + + dep[0] = -1; + dfs2(root, 0); + + for (int i = 1; i <= n; i++) { + ans += static_cast(c[i]) * dep[i]; + } + + cout << ans << endl; + + return 0; +} diff --git a/BZOJ/1827/data/1.in b/BZOJ/1827/data/1.in new file mode 100644 index 00000000..3aef6110 --- /dev/null +++ b/BZOJ/1827/data/1.in @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:bd869079ca2802c71cdbfadd4357f873f5066d5477311c9b62a0402800269507 +size 977778 diff --git a/BZOJ/1827/data/1.out b/BZOJ/1827/data/1.out new file mode 100644 index 00000000..cd5ac069 --- /dev/null +++ b/BZOJ/1827/data/1.out @@ -0,0 +1,3 @@ +version https://git-lfs.github.com/spec/v1 +oid sha256:6e822b5cf5ddb29e21d415d18e3ff8b0b640cb0f1d44f958567a65ec70019176 +size 15 diff --git a/BZOJ/1827/data/10.in b/BZOJ/1827/data/10.in new file mode 100644 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