Submission #1159983

#	Time	Username	Problem	Language	Result	Execution time	Memory
1159983		nhphuc	Factories (JOI14_factories)	C++20	Compilation error	0 ms	0 KiB

factories

#include <bits/stdc++.h>
#include "factories.h"
using namespace std;

const int N = 500500;
const long long inf = 1e16;

int sub[N], pos[N];
long long dis[N], mn[N];
pair<int, long long> par[N];
vector<int> modify;
vector<pair<int, int>> adj[N];

void dfs (int u, int p = 0, long long dep = 0){
    sub[u] = 1;
    dis[u] = dep;
    for (auto [v, d] : adj[u]){
        if (v != p && pos[v] == 0){
            dfs(v, u, dep + 1ll * d);
            sub[u] += sub[v];
        }
    }
}

int centroid (int u, int p, int n){
    for (auto [v, d] : adj[u]){
        if (v != p && pos[v] == 0 && sub[v] * 2 > n){
            return centroid(v, u, n);
        }
    }
    return u;
}

void buildCentroid (int u){
    pos[u] = 1;
    dfs(u); 
    vector<int> nxt;
    for (auto [v, d] : adj[u]){
        if (pos[v] == 0){
            int nr = centroid(v, u, sub[v]);
            par[nr] = {u, dis[nr]};
            nxt.push_back(nr);
        }
    }
    for (int r : nxt){
        // cout << u - 1 << " " << r - 1 << "\n";
        buildCentroid(r);
    }
}

void Init (int n, int a[], int b[], int d[]){
    for (int i = 0; i < n - 1; ++i){
        ++a[i]; ++b[i];
        adj[a[i]].push_back({b[i], d[i]});
        adj[b[i]].push_back({a[i], d[i]});
    }
    dfs(1);
    int root = centroid(1, 0, n);
    buildCentroid(root);
    fill(mn, mn + N, inf);
    return;
}

void upd (int u, long long dep = 0){
    mn[u] = min(mn[u], dep);
    modify.push_back(u);
    auto [v, d] = par[u];
    if (v != 0){
        upd(v, dep + 1ll * d);
    }
    return;
}

long long get (int u, long long dep = 0){
    long long ans = dep + mn[u];
    auto [v, d] = par[u];
    if (v != 0){
        ans = min(ans, get(v, dep + d));
    }
    return ans;
}

long long Query (int S, int X[], int T, int Y[]){
    modify.clear();
    for (int i = 0; i < S; ++i){
        upd(++X[i]);
    }
    long long ans = inf;
    for (int i = 0; i < T; ++i){
        ans = min(ans, get(++Y[i]));
    }
    for (int u : modify){
        mn[u] = inf;
    }
    return ans;
}

int n, q, s, t, a[N], b[N], d[N];

int32_t main (){
    ios::sync_with_stdio(false); cin.tie(nullptr);
    if (fopen ("test.inp", "r")){
        freopen ("test.inp", "r", stdin);
        freopen ("test.out", "w", stdout);
    }
    cin >> n >> q;
    for (int i = 0; i < n - 1; ++i){
        cin >> a[i] >> b[i] >> d[i];
    }
    Init(n, a, b, d);
    while (q--){
        cin >> s >> t;
        int x[s], y[t];
        for (int i = 0; i < s; ++i){
            cin >> x[i];
        }
        for (int i = 0; i < t; ++i){
            cin >> y[i];
        }
        cout << Query(s, x, t, y) << "\n";
    }
}

Compilation message (stderr)

factories.cpp: In function 'int32_t main()':
factories.cpp:103:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  103 |         freopen ("test.inp", "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
factories.cpp:104:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  104 |         freopen ("test.out", "w", stdout);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccSoxILN.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccaZNqgp.o:factories.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status