Submission #780076

#	Time	Username	Problem	Language	Result	Execution time	Memory
780076		cheat_when_I_was_young	Factories (JOI14_factories)	C++17	Compilation error	0 ms	0 KiB

factories

#include "factories.h"
#include "bits/stdc++.h"
using namespace std;
#define int long long

const int NM = 5e5 + 5;

int in[NM], d[NM], h[NM];
vector<int> tour;
vector<pair<int,int>> adj[NM];

void dfs(int u, int par) {
    in[u] = tour.size();
    tour.push_back(u);
    for (auto &vv: adj[u]) {
        int v = vv.first, w = vv.second;
        if (v == par) continue;
        d[v] = d[u] + w;
        h[v] = h[u] + 1;
        dfs(v, u);
        tour.push_back(u);
    }
}

const int LG = __lg(NM) + 1;

pair<int,int> ST[LG][NM];

void build() {
    for (int i = 0; i < (int)tour.size(); ++i)
        ST[0][i] = {h[tour[i]], tour[i]};
    for (int j = 1; j < LG; ++j)
        for (int i = 0; i + (1<<j) - 1 < (int)tour.size(); ++i)
            ST[j][i] = min(ST[j-1][i], ST[j-1][i + (1<<(j-1))]);
}

int lca(int u, int v) {
    int l = in[u], r = in[v];
    if (l > r) swap(l, r);
    int k = __lg(r - l + 1);
    return min(ST[k][l], ST[k][r - (1<<k) + 1]).second;
}

int color[NM], dp[NM][3], ans;
vector<int> newAdj[NM], node;

void Init(int N, int A[], int B[], int D[]) {
    for (int i = 0; i < N-1; ++i) {
        adj[A[i]].push_back({B[i], D[i]});
        adj[B[i]].push_back({A[i], D[i]});
    }
    dfs(1, 1);
    build();
    ans = 1e18;
    for (int i = 0; i < N; ++i) dp[i][1] = dp[i][2] = 1e18;
}

bool cmp(int x, int y) {
    return in[x] < in[y];
}

void DFS(int u, int par) {
    for (int &v: newAdj[u]) {
        if (v == par) continue;
        DFS(v, u);
    }
    ans = min(ans, dp[u][0] + dp[u][1]);
}

long long Query(int S, int X[], int T, int Y[]) {

    for (int i = 0; i < S; ++i) color[X[i]] = 1;
    for (int i = 0; i < T; ++i) {
        if (color[Y[i]] == 1) {
            for (int j = 0; j < S; ++j) color[X[j]] = 1;
            for (int j = 0; j < T; ++j) color[Y[j]] = 1;
            return 0;
        }
        color[Y[i]] = 2;
    }

    for (int i = 0; i < S; ++i) node.push_back(X[i]);
    for (int i = 0; i < T; ++i) node.push_back(Y[i]);
    sort(node.begin(), node.end());
    int N = node.size();
    for (int i = 1; i < N; ++i) node.push_back(lca(node[i], node[i-1]));
    sort(node.begin(), node.end());

    stack<int> s;
    for (int &i: node) {
        if (s.empty()) {
            s.push(i);
            continue;
        }
        while (!s.empty() && lca(i, s.top()) != s.top()) s.pop();
        if (!s.empty()) {
            newAdj[s.top()].push_back(i);
            newAdj[i].push_back(s.top());
            s.push(i);
        }
    }

    DFS(node[0], node[0]);

    ans = 1e18;
    for (int &i: node) {
        color[i] = 0;
        dp[i][1] = dp[i][2] = 1e18;
        newAdj[i].clear();
    }
}

Compilation message (stderr)

factories.cpp: In function 'long long int Query(long long int, long long int*, long long int, long long int*)':
factories.cpp:89:16: warning: control reaches end of non-void function [-Wreturn-type]
   89 |     stack<int> s;
      |                ^
/usr/bin/ld: /tmp/ccovhy3C.o: in function `main':
grader.cpp:(.text.startup+0x37d): undefined reference to `Init(int, int*, int*, int*)'
/usr/bin/ld: grader.cpp:(.text.startup+0x412): undefined reference to `Query(int, int*, int, int*)'
collect2: error: ld returned 1 exit status