제출 #976807

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
976807		saayan007	공장들 (JOI14_factories)	C++17	0 / 100	109 ms	53852 KiB

factories

#include "factories.h"
#include "bits/stdc++.h"
using namespace std;
 
#define rep(i, a, b) for(int (i) = (a); i <= (b); ++i)
#define repd(i, a, b) for(int (i) = (a); i >= (b); --i)

#define em emplace
#define eb emplace_back

#define pi pair<int, int>
#define fr first
#define sc second
#define mp make_pair

const char nl = '\n';
 
#warning using int and long long as well
using ll = long long;
/* #warning checkconstanst as per subtask */
const int mxN = 5e5L + 10;
const int logN = 20;
vector<pair<int, ll>> adj[mxN];
int n;
int par[mxN][logN + 1], dep[mxN];
ll dist[mxN][logN + 1];
int tmr = 0;
int tin[mxN], tout[mxN];
vector<pair<int, ll>> vt[mxN];
set<int> white, black, graph;
ll cB, cW;
ll ans;
int TEST = 0;
 
void dfs(int x, int p) {
    tin[x] = tmr++;
    for(auto U : adj[x]) {
        int y = U.first; ll w = U.second;
        if(y == p) continue;
        dep[y] = dep[x] + 1;
        dist[y][0] = w;
        par[y][0] = x;
        dfs(y, x);
    }
    tout[x] = tmr++;
}
 
void Init(int N, int A[], int B[], int D[]) {
    n = N;
    for(int i = 0; i < N - 1; ++i) {
        adj[A[i]].emplace_back(B[i], ll(D[i]));
        adj[B[i]].emplace_back(A[i], ll(D[i]));
    }
 
    dep[0] = 0;
    dist[0][0] = -1;
    par[0][0] = -1;
    dfs(0, -1);
    for(int j = 1; j < logN; ++j) {
        for(int i = 0; i < N; ++i) {
            if(dep[i] < (1ll << j)) {
                par[i][j] = dist[i][j] = -1;
            }
            else {
                par[i][j] = par[par[i][j - 1]][j - 1];
                dist[i][j] = dist[i][j - 1] + dist[par[i][j - 1]][j - 1];
            }
        }
    }
    /* rep(i, 0, n - 1) { */
    /*     cout << i << ": "; */
    /*     cout << dep[i] << ' ' << par[i][0] << ' ' << dist[i][0]; */
    /*     cout << nl; */
    /* } */
}
 
int lca(int x, int y) {
    /* cout << "Query of lca of " << x << ' ' << y << " = "; */
    if(dep[x] < dep[y]) swap(x, y);
    ll diff = dep[x] - dep[y];
    /* cout << diff << ' '; */
    for(int j = logN - 1; j >= 0; --j) {
        if(!(diff & (1ll << j))) continue;
        x = par[x][j];
    }
    /* cout << x << ' ' << y << ' '; */
 
    /* if(x == y) cout << x << nl; */
    if(x == y) return x;
 
    for(int j = logN - 1; j >= 0; --j) {
        if(par[x][j] == par[y][j]) continue;
        x = par[x][j];
        y = par[y][j];
    }
    /* cout << x << ' ' << y << ' '; */
    x = par[x][0];
    y = par[y][0];
    assert(x == y);
    /* cout << x << nl; */
    return x;
}

ll distance(int x, int y) {
    ll res = 0;
    if(dep[x] < dep[y]) swap(x, y);
    ll diff = dep[x] - dep[y];
    for(int j = logN - 1; j >= 0; --j) {
        if(!(diff & (1ll << j))) continue;
        res += dist[x][j];
        x = par[x][j];
    }
 
    if(x == y) return res;
 
    for(int j = logN - 1; j >= 0; --j) {
        if(par[x][j] == par[y][j]) continue;
        res += dist[x][j];
        x = par[x][j];
        res += dist[y][j];
        y = par[y][j];
    }
    res += dist[x][0];
    x = par[x][0];
    res += dist[y][0];
    y = par[y][0];
    assert(x == y);
    return res;
}
 
bool contains(int up, int dn) {
    return (tin[up] < tin[dn] && tout[dn] < tout[up]);
}

/* void solve(int x, int p, ll tot) { */
/*     if(black.count(x) && tot < ans) ans = tot; */
/*     for(auto U : vt[x]) { */
/*         int y = U.fr; ll w = U.sc; */
/*         if(y == p) continue; */
/*         solve(y, x, tot + w); */
/*     } */
/* } */

bool proc[mxN];
int sz[mxN];

int get_sz(int x, int p) {
    sz[x] = 1;
    for(auto U : vt[x]) {
        int y = U.fr;
        if(y == p || proc[y]) continue;
        sz[x] += get_sz(y, x);
    }
    return sz[x];
}

int get_cen(int x, int p, int tot) {
    for(auto U : vt[x]) {
        int y = U.fr;
        if(y == p || proc[y] || sz[p] * 2 <= tot) continue;
        return get_cen(y, x, tot);
    }
    return x;
}

void solve(int x, int p, ll dd) {
    if(white.count(x)) ans = min(ans, dd + cB);
    if(black.count(x)) ans = min(ans, dd + cW);
    for(auto U : vt[x]) {
        int y = U.fr; ll w = U.sc;
        if(y == p || proc[y]) continue;
        solve(y, x, dd + w);
    }
}

void decompose(int x, int p) {
    int c = get_cen(x, p, get_sz(x, p));

    cW = cB = 1e18;
    if(white.count(c)) cW = 0;
    else if(black.count(c)) cB = 0;
    solve(c, p, 0);

    proc[c] = 1;
    for(auto U : vt[c]) {
        int d = U.fr;
        if(proc[d]) continue;
        decompose(d, c);
    }
}

long long Query(int S, int X[], int T, int Y[]) {
    /* cout << nl; */
    /* cout << "TESTCASE#" << ++TEST << nl; */
    vector<int> nodes;

    graph.clear();
    white.clear();
    rep(i, 0, S - 1) {
        int x = X[i];
        white.insert(x);
        if(!graph.count(x)) while(int(vt[x].size())) vt[x].pop_back();
        graph.insert(x);
        nodes.eb(x);
    }
    black.clear();
    rep(i, 0, T - 1) {
        int y = Y[i];
        black.insert(y);
        if(!graph.count(y)) while(int(vt[y].size())) vt[y].pop_back();
        graph.insert(y);
        nodes.eb(y);
    }

    sort(nodes.begin(), nodes.end(), [&](int left, int right) {
        return tin[left] < tin[right];
    });
    /* cout << "NODES: "; */
    /* for(int i : nodes) cout << i << ' '; */
    /* cout << nl; */
    rep(i, 0, S + T - 2) {
        nodes.eb(lca(nodes[i], nodes[i + 1]));
    }
    sort(nodes.begin(), nodes.end(), [&](int left, int right) {
        return tin[left] < tin[right];
    });
    nodes.erase(unique(nodes.begin(), nodes.end()), nodes.end());
    /* cout << "NODES: "; */
    /* for(int i : nodes) cout << i << ' '; */
    /* cout << nl; */
    
    vector<int> st;
    st.eb(nodes[0]);
    rep(i, 1, int(nodes.size()) - 1) {
        int u = nodes[i];
        while(int(st.size()) >= 2 && !contains(st.back(), u)) {
            int a = st[int(st.size()) - 1];
            int b = st[int(st.size()) - 2];
            ll distab = distance(a, b);
            if(!graph.count(a)) while(int(vt[a].size())) vt[a].pop_back();
            graph.insert(a);
            vt[a].eb(b, distab);
            /* cout << "Edge " << a << ' ' << b << ' ' << distab << nl; */
            if(!graph.count(b)) while(int(vt[b].size())) vt[b].pop_back();
            graph.insert(b);
            vt[b].eb(a, distab);
            st.pop_back();
        }
        st.eb(u);
    }

    while(int(st.size()) >= 2) {
        int a = st[int(st.size()) - 1];
        int b = st[int(st.size()) - 2];
        ll distab = distance(a, b);
        if(!graph.count(a)) while(int(vt[a].size())) vt[a].pop_back();
        graph.insert(a);
        vt[a].eb(b, distab);
        /* cout << "Edge " << a << ' ' << b << ' ' << distab << nl; */
        if(!graph.count(b)) while(int(vt[b].size())) vt[b].pop_back();
        graph.insert(b);
        vt[b].eb(a, distab);
        st.pop_back();
    }

    ans = 1e18;
    for(int U : graph) {
        proc[U] = 0;
    }
    /* for(int w : white) { */
    /*     solve(w, -1, 0); */
    /* } */
    decompose(X[0], -1);
    return ans;
}

컴파일 시 표준 에러 (stderr) 메시지

factories.cpp:18:2: warning: #warning using int and long long as well [-Wcpp]
   18 | #warning using int and long long as well
      |  ^~~~~~~
factories.cpp: In function 'long long int Query(int, int*, int, int*)':
factories.cpp:5:30: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
    5 | #define rep(i, a, b) for(int (i) = (a); i <= (b); ++i)
      |                              ^
factories.cpp:199:5: note: in expansion of macro 'rep'
  199 |     rep(i, 0, S - 1) {
      |     ^~~
factories.cpp:5:30: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
    5 | #define rep(i, a, b) for(int (i) = (a); i <= (b); ++i)
      |                              ^
factories.cpp:207:5: note: in expansion of macro 'rep'
  207 |     rep(i, 0, T - 1) {
      |     ^~~
factories.cpp:5:30: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
    5 | #define rep(i, a, b) for(int (i) = (a); i <= (b); ++i)
      |                              ^
factories.cpp:221:5: note: in expansion of macro 'rep'
  221 |     rep(i, 0, S + T - 2) {
      |     ^~~
factories.cpp:5:30: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
    5 | #define rep(i, a, b) for(int (i) = (a); i <= (b); ++i)
      |                              ^
factories.cpp:234:5: note: in expansion of macro 'rep'
  234 |     rep(i, 1, int(nodes.size()) - 1) {
      |     ^~~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 18
• Subtask 3: 0 / 67