Submission #1098781

#	Time	Username	Problem	Language	Result	Execution time	Memory
1098781		TrinhKhanhDung	Railway Trip 2 (JOI22_ho_t4)	C++14	52 / 100	593 ms	41552 KiB

Main

#include <bits/stdc++.h>
#define ll long long
#define fi first
#define se second
#define sz(x) (int)x.size()
#define ALL(v) v.begin(),v.end()
#define MASK(k) (1LL << (k))
#define BIT(x, i) (((x) >> (i)) & 1)
#define oo (ll)1e18
#define INF (ll)1e9
#define MOD (ll)(1e9 + 7)

using namespace std;

template<class T1, class T2>
    bool maximize(T1 &a, T2 b){if(a < b){a = b; return true;} return false;}

template<class T1, class T2>
    bool minimize(T1 &a, T2 b){if(a > b){a = b; return true;} return false;}

template<class T1, class T2>
    void add(T1 &a, T2 b){a += b; if(a >= MOD) a -= MOD;}

template<class T1, class T2>
    void sub(T1 &a, T2 b){a -= b; if(a < 0) a += MOD;}

template<class T>
    void cps(T &v){sort(ALL(v)); v.resize(unique(ALL(v)) - v.begin());}

const int maxN = 1e5 + 10, LOG = 17;

int N, K, M, Q;
pair<int, int> laz[maxN * 4];
pair<int, int> seg[20][maxN * 4];

pair<int, int> combine(pair<int, int> a, pair<int, int> b){
    return {min(a.fi, b.fi), max(a.se, b.se)};
}

void push(int i, int l, int r, int u, int v, int c){
    if(r < u || v < l) return;
    if(u <= l && r <= v){
        laz[i] = combine(laz[i], {c, c});
        return;
    }
    int m = (l + r) >> 1;
    push(i * 2, l, m, u, v, c);
    push(i * 2 + 1, m + 1, r, u, v, c);
}

void run(int i, int l, int r, pair<int, int> prs){
    prs = combine(prs, laz[i]);
    if(l == r){
        seg[0][i] = prs;
        return;
    }
    int m = (l + r) >> 1;
    run(i * 2, l, m, prs);
    run(i * 2 + 1, m + 1, r, prs);
    seg[0][i] = combine(seg[0][i * 2], seg[0][i * 2 + 1]);
//    cout << l << ' ' << r << ' ' << seg[0][i].fi << ' ' << seg[0][i].se << '\n';
}

pair<int, int> range(int t, int i, int l, int r, int u, int v){
    if(r < u || v < l) return {N + 1, 0};
    if(u <= l && r <= v) return seg[t][i];
    int m = (l + r) >> 1;
    return combine(range(t, i * 2, l, m, u, v), range(t, i * 2 + 1, m + 1, r, u, v));
}

void build(int t, int i, int l, int r){
    if(l == r){
        pair<int, int> prs = seg[t - 1][i];
        seg[t][i] = range(t - 1, 1, 1, N, prs.fi, prs.se);
        return;
    }
    int m = (l + r) >> 1;
    build(t, i * 2, l, m);
    build(t, i * 2 + 1, m + 1, r);
    seg[t][i] = combine(seg[t][i * 2], seg[t][i * 2 + 1]);
}

void solve(){
    cin >> N >> K;
    cin >> M;

    for(int i = 0; i < 4 * N; i++){
        laz[i].fi = N + 1;
    }

    for(int i = 1; i <= N; i++){
        push(1, 1, N, i, i, i);
    }

    for(int i = 1; i <= M; i++){
        int s, t; cin >> s >> t;
        if(s <= t){
            push(1, 1, N, s, min(t, s + K - 1), t);
        }
        else{
            push(1, 1, N, max(t, s - K + 1), s, t);
        }
    }

    run(1, 1, N, {N + 1, 0});
    for(int i = 1; i < LOG; i++){
        build(i, 1, 1, N);
    }

    cin >> Q;
    while(Q--){
        int s, t; cin >> s >> t;

        pair<int, int> tmp = range(LOG - 1, 1, 1, N, s, s);
        if(t < tmp.fi || t > tmp.se){
            cout << -1 << '\n';
            continue;
        }

        pair<int, int> cur = {s, s};
        int ans = 1;
        for(int i = LOG - 1; i >= 0; i--){
            pair<int, int> tmp = range(i, 1, 1, N, cur.fi, cur.se);
            if(tmp.fi <= t && t <= tmp.se) continue;

            ans += MASK(i);
            cur = tmp;
        }

        cout << ans << '\n';
    }
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);
//     freopen("partner.inp","r",stdin);
//     freopen("partner.out","w",stdout);

    int t = 1;
//    cin >> t;
    while(t--){
        solve();
    }

    return 0;
}

• Subtask 1: 8 / 8
• Subtask 2: 8 / 8
• Subtask 3: 11 / 11
• Subtask 4: 25 / 25
• Subtask 5: 0 / 35
• Subtask 6: 0 / 13