Submission #1113034

#	Time	Username	Problem	Language	Result	Execution time	Memory
1113034		Mike_Vu	Passport (JOI23_passport)	C++14	48 / 100	302 ms	112160 KiB

passport

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double dou;
#define pii pair<int, int>
#define fi first
#define se second
#define pb push_back
#define MASK(x) (1LL<<(x))
#define BITj(x, j) (((x)>>(j))&1)

template<typename T> bool maximize(T &x, const T &y) {
    if (x < y) {x = y; return 1;}
    return 0;
}
template<typename T> bool minimize(T &x, const T &y) {
    if (x > y) {x = y; return 1;}
    return 0;
}

const int maxn = 2e5+5, INF = (int)1e9+7;
int n, trsz;
vector<int> adj[maxn*4];
int dis1[maxn], dis2[maxn], dis3[maxn];

namespace SMT{
    void init() {
        trsz = 1;
        while (trsz < n) trsz <<= 1;
        for (int i = trsz-1; i; i--) {
            int lc = i<<1, rc = (i<<1)|1;
            adj[lc].pb(i);
            adj[rc].pb(i);
        }
    }
    void buildedge(int u, int l, int r){
        l += trsz - 1;
        r += trsz;
        u += trsz-1;
        while (l < r){
            if (l&1) {
                adj[l++].pb(u);
            }
            if (r&1) {
                adj[--r].pb(u);
            }
            l >>= 1;
            r >>= 1;
        }
    }
}

void dijkstra(int dis[]) {
    priority_queue<pii> q;
    for (int i= 1; i < (trsz<<1); i++) {
        q.push({-dis[i], i});
    }
    while (!q.empty()) {
        int u = q.top().se, w = -q.top().fi;
        q.pop();
        if (w != dis[u]) continue;
        if (dis[u] >= INF) continue;
        for (int i= 0; i < (int)adj[u].size(); i++) {
            int v = adj[u][i];
            if (minimize(dis[v], dis[u]+(v>=trsz))) {
                q.push({-dis[v], v});
            }
        }
    }
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
//    #define name "task"
//    if (fopen(name".inp", "r")) {
//        freopen(name".inp", "r", stdin);
//        freopen(name".out", "w", stdout);
//    }
    //input + init SMT
    cin >> n;
    SMT::init();
    //build graph
    for (int i= 1; i <= n; i++) {
        int l, r;
        cin >> l >> r;
        SMT::buildedge(i, l, r);
    }
    //dijkstra 12
    memset(dis1, 0x3f, sizeof(dis1));
    dis1[trsz] = 0;
    dijkstra(dis1);
    memset(dis2, 0x3f, sizeof(dis2));
    dis2[trsz+n-1] = 0;
    dijkstra(dis2);
    //merge
    memset(dis3, 0x3f, sizeof(dis3));
    for (int i = 1; i <= n; i++) {
        int u = i+trsz-1;
        if (max(dis1[u], dis2[u]) >= INF) {
            continue;
        }
        dis3[u] = dis1[u]+dis2[u]-1;
        if (i == 1 || i == n) dis3[u]++;
    }
    //dijkstra 3
    dijkstra(dis3);
//    for (int i = 1; i < trsz*2; i++) {
//        cout << "node " << i << ' ' << dis1[i] << ' ' << dis2[i] << ' ' << dis3[i] << "\n";
//    }
    //answer queries
    int q;
    cin >> q;
    while (q--) {
        int u;
        cin >> u;
        u += trsz - 1;
        if (dis3[u] >= INF) cout << "-1\n";
        else cout << dis3[u] << "\n";
    }
}

• Subtask 1: 0 / 6
• Subtask 2: 16 / 16
• Subtask 3: 24 / 24
• Subtask 4: 8 / 8
• Subtask 5: 0 / 46