Submission #1086862

#	Time	Username	Problem	Language	Result	Execution time	Memory
1086862		vjudge1	Passport (JOI23_passport)	C++17	100 / 100	1113 ms	189056 KiB

passport

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

#define int long long
#define FOR(i, a, b) for (int i = (a); i <= (b); i++)
#define FORD(i, a, b) for (int i = (b); i >= (a); i --)
#define REP(i, a) for (int i = 0; i < (a); ++i)
#define REPD(i, a) for (int i = (a) - 1; i >= 0; --i)

#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)


constexpr ll LINF = (1ll << 60);
constexpr int INF = (1ll << 30);
constexpr int Mod = 1e9 + 7;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

/*
    Phu Trong from Nguyen Tat Thanh High School for gifted student
*/

template <class X, class Y>
    bool minimize(X &x, const Y &y){
        X eps = 1e-9;
        if (x > y + eps) {x = y; return 1;}
        return 0;
    }

template <class X, class Y>
    bool maximize(X &x, const Y &y){
        X eps = 1e-9;
        if (x + eps < y) {x = y; return 1;}
        return 0;
    }
#define MAX                     200005
#define MAX_NODE                1200005
#define lson                    (nd << 1)
#define rson                    (nd << 1 | 1)


int numNode;
int nArr, numQuery;
int l[MAX], r[MAX];
int ID[MAX_NODE];


vector<pair<int, int>> G[MAX_NODE];

void addEdge(int u, int v, int w){
    G[u].emplace_back(v, w);
}
void build(int nd, int l, int r){
    if (l == r){
        addEdge(l, ID[nd], 0);
        return;
    }
    int m = (l + r) >> 1;
    build(lson, l, m);
    build(rson, m + 1, r);

    addEdge(ID[lson], ID[nd], 0);
    addEdge(ID[rson], ID[nd], 0);
}

void addEdge(int nd, int l, int r, int u, int v, int w, int from){
    if (u > r || v < l) return;
    if (u <= l && v >= r){
        addEdge(ID[nd], from, w);
        return;
    }
    int m = (l + r) >> 1;
    addEdge(lson, l, m, u, v, w, from);
    addEdge(rson, m + 1, r, u, v, w, from);
}

void dijkstra(int s, int minDist[]){
    priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> q;
    q.emplace(0, s);
    for (int i = 1; i <= numNode; ++i) minDist[i] = INF;

    minDist[s] = 0;
    while(q.size()){
        int du, u; tie(du, u) = q.top(); q.pop();
        if (du > minDist[u]) continue;

        for (pair<int, int>&x : G[u]){
            int v = x.first, w = x.second;
            if(minimize(minDist[v], minDist[u] + w)){
                q.emplace(minDist[v], v);
            }
        }
    }
}

int minDist[2][MAX_NODE];

int F[MAX_NODE];

void process(void){
    cin >> nArr;
    numNode = nArr;
    for (int i = 1; i <= nArr * 4; ++i) ID[i] = ++numNode;
    build(1, 1, nArr);
    for (int i = 1; i <= nArr; ++i){
        cin >> l[i] >> r[i];
        addEdge(1, 1, nArr, l[i], r[i], 0, ++numNode);
        addEdge(numNode, i, 1);
    }
    dijkstra(1, minDist[0]);
    dijkstra(nArr, minDist[1]);

    priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> q;
    for (int i = 1; i <= numNode; ++i){
        F[i] = minDist[0][i] + minDist[1][i];
        q.emplace(F[i], i);
    }

    while(q.size()){
        int du, u; tie(du, u) = q.top(); q.pop();
        if(du > F[u]) continue;

        for (pair<int, int>&x : G[u]){
            int v = x.first, w = x.second;
            if(minimize(F[v], F[u] + w)){
                q.emplace(F[v], v);
            }
        }
    }
    cin >> numQuery;
    for (int i = 1; i <= numQuery; ++i){
        int x; cin >> x;
        cout << (F[x] >= INF ? -1 : F[x]) << '\n';
    }
}
signed main(){
    #define name "Whisper"
    cin.tie(nullptr) -> sync_with_stdio(false);
    //freopen(name".inp", "r", stdin);
    //freopen(name".out", "w", stdout);
    process();
    return (0 ^ 0);
}

• Subtask 1: 6 / 6
• Subtask 2: 16 / 16
• Subtask 3: 24 / 24
• Subtask 4: 8 / 8
• Subtask 5: 46 / 46