Submission #311944

#TimeUsernameProblemLanguageResultExecution timeMemory
311944T0p_Factories (JOI14_factories)C++14
0 / 100
8010 ms61448 KiB
#include <bits/stdc++.h> #include "factories.h" using namespace std; #define N 500500 #define pb push_back struct GRAPH { int node; long long weight; }; int root; int sz[N], pa[N], lv[N], jmp_node[20][N]; long long dis[N], jmp_dis[20][N], dp[20][N]; bool visit[N]; vector<GRAPH> g[N]; queue<int> bt; int get_sz(int u, int p) { sz[u] = 1; for(auto x : g[u]) if(x.node != p) sz[u] += get_sz(x.node, u); return sz[u]; } int get_centroid(int u, int p, int n) { bool ch = (n - sz[u] <= n/2) ? true : false; int nu = 0, nf = 0; for(auto x : g[u]) { if(visit[x.node] || x.node == p) continue ; if(sz[x.node] > n/2) { ch = false; if(sz[x.node] > nf) { nf = sz[x.node]; nu = x.node; } } } return (ch) ? u : get_centroid(nu, u, n); } int build(int u, int p) { int c = get_centroid(u, p, get_sz(u, p)); visit[c] = true; for(auto x : g[c]) { if(visit[x.node]) continue ; pa[build(x.node, c)] = c; } return c; } void dfs(int u, int l) { lv[u] = l; for(auto x : g[u]) { if(lv[x.node]) continue ; jmp_node[0][x.node] = u; jmp_dis[0][x.node] = x.weight; dfs(x.node, l+1); } } long long get_dis(int u, int v) { long long ret = 0; if(lv[u] < lv[v]) swap(u, v); for(int i=19 ; i>=0 ; i--) if(lv[jmp_node[i][u]] >= lv[v]) { ret += jmp_dis[i][u]; u = jmp_node[i][u]; } if(u == v) return ret; for(int i=19 ; i>=0 ; i--) if(jmp_node[i][u] != jmp_node[i][v]) { ret += jmp_dis[i][u] + jmp_dis[i][v]; u = jmp_node[i][u], v = jmp_node[i][v]; } return ret + jmp_dis[0][u] + jmp_dis[0][v]; } void Init(int n, int u[], int v[], int w[]) { for(int i=0 ; i<n-1 ; i++) { g[u[i]+1].pb({v[i]+1, w[i]}); g[v[i]+1].pb({u[i]+1, w[i]}); } dfs(1, 1); build(1, 0); for(int i=1 ; i<=n ; i++) { visit[i] = false; dis[i] = 1e15; } for(int i=1 ; i<20 ; i++) for(int j=1 ; j<=n ; j++) { jmp_node[i][j] = jmp_node[i-1][jmp_node[i-1][j]]; jmp_dis[i][j] = jmp_dis[i-1][j] + jmp_dis[i-1][jmp_node[i-1][j]]; } for(int i=1 ; i<=n ; i++) { int now = i; for(int j=0 ; true ; j++, now = pa[now]) { if(!now) break ; dp[j][i] = get_dis(i, now); } } } long long Query(int s, int x[], int t, int y[]) { long long ans = 1e15; for(int i=0 ; i<s ; i++) { int now = x[i]+1; for(int j=0 ; true ; j++, now = pa[now]) { if(!now) break ; if(!visit[now]) { visit[now] = true; bt.push(now); } dis[now] = min(dis[now], dp[j][x[i]+1]); } } for(int i=0 ; i<t ; i++) { int now = y[i]+1; for(int j=0 ; true ; j++, now = pa[now]) { if(!now) break ; ans = min(ans, dis[now] + dp[j][y[i]+1]); } } while(!bt.empty()) { visit[bt.front()] = false; dis[bt.front()] = 1e15; bt.pop(); } return ans; }
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