Submission #922259

#	Time	Username	Problem	Language	Result	Execution time	Memory
922259		Beerus13	Factories (JOI14_factories)	C++14	100 / 100	4351 ms	368464 KiB

factories

#include <bits/stdc++.h>
// #include "factories.h"
using namespace std;
#define ll long long
#define pii pair<int, ll>
const int N = 5e5 + 5;
const ll inf = 1e15;
 
int n, q, S, T, centroid;
int sz[N], vt[N];
vector<pii> g[N], ancestors[N];
bool del[N];
ll dp[N];

int dfs_size(int u, int p = 0) {
    sz[u] = 1;
    for(auto [v, w] : g[u]) if(v != p && !del[v]) {
        sz[u] += dfs_size(v, u);
    }
    return sz[u];
}
 
int find_centroid(int u, int p, int num) {
    for(auto [v, w] : g[u]) if(v != p && !del[v] && sz[v] > num / 2) return find_centroid(v, u, num);
    return u;
}
 
void dfs_centroid(int u, int par, ll dis) {
    for(auto [v, w] : g[u]) if(v != par && !del[v]) dfs_centroid(v, u, dis + w);
    ancestors[u].emplace_back(centroid, dis);
}

void decomposition(int u) {
    centroid = find_centroid(u, 0, dfs_size(u));
    del[centroid] = 1;
    dfs_centroid(centroid, centroid, 0);
    for(auto [v, w] : g[centroid]) {
        if(!del[v]) decomposition(v);
    }
}
 
void add(int u) {
    for(auto [v, w] : ancestors[u]) dp[v] = min(dp[v], w);
}
 
void remove(int u) {
    for(auto [v, w] : ancestors[u]) dp[v] = inf;
}
 
ll get(int u) {
    ll ans = inf;
    for(auto [v, w] : ancestors[u]) ans = min(ans, w + dp[v]);
    return ans;
}

void Init(int N, int A[], int B[], int D[]) {
    for(int i = 0; i < N - 1; ++i) {
        A[i]++; B[i]++;
        g[A[i]].emplace_back(B[i], D[i]);
        g[B[i]].emplace_back(A[i], D[i]);
    }
    for(int i = 1; i <= N; ++i) dp[i] = inf;
    decomposition(1);
}
 
ll Query(int S, int X[], int T, int Y[]) {
	for (int i = 0; i < S; i++)
		add(X[i] + 1);
 
	ll ans = 1e15;
	for (int i = 0; i < T; i++)
		ans = min(ans, get(Y[i] + 1));
 
	for (int i = 0; i < S; i++)
		remove(X[i] + 1);
	return ans;
}

// https://oj.uz/problem/view/JOI14_factories

Compilation message (stderr)

factories.cpp: In function 'int dfs_size(int, int)':
factories.cpp:17:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   17 |     for(auto [v, w] : g[u]) if(v != p && !del[v]) {
      |              ^
factories.cpp: In function 'int find_centroid(int, int, int)':
factories.cpp:24:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   24 |     for(auto [v, w] : g[u]) if(v != p && !del[v] && sz[v] > num / 2) return find_centroid(v, u, num);
      |              ^
factories.cpp: In function 'void dfs_centroid(int, int, long long int)':
factories.cpp:29:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   29 |     for(auto [v, w] : g[u]) if(v != par && !del[v]) dfs_centroid(v, u, dis + w);
      |              ^
factories.cpp: In function 'void decomposition(int)':
factories.cpp:37:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   37 |     for(auto [v, w] : g[centroid]) {
      |              ^
factories.cpp: In function 'void add(int)':
factories.cpp:43:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   43 |     for(auto [v, w] : ancestors[u]) dp[v] = min(dp[v], w);
      |              ^
factories.cpp: In function 'void remove(int)':
factories.cpp:47:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   47 |     for(auto [v, w] : ancestors[u]) dp[v] = inf;
      |              ^
factories.cpp: In function 'long long int get(int)':
factories.cpp:52:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   52 |     for(auto [v, w] : ancestors[u]) ans = min(ans, w + dp[v]);
      |              ^

• Subtask 1: 15 / 15
• Subtask 2: 18 / 18
• Subtask 3: 67 / 67