Submission #1138070

#	Time	Username	Problem	Language	Result	Execution time	Memory
1138070		steveonalex	Railway Trip 2 (JOI22_ho_t4)	C++20	100 / 100	263 ms	34392 KiB

Main

#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
 
#define MASK(i) (1ULL << (i))
#define GETBIT(mask, i) (((mask) >> (i)) & 1)
#define ALL(v) (v).begin(), (v).end()
 
ll max(ll a, ll b){return (a > b) ? a : b;}
ll min(ll a, ll b){return (a < b) ? a : b;}
ll gcd(ll a, ll b){return __gcd(a, b);}
ll lcm(ll a, ll b){return a / gcd(a, b) * b;}
 
ll LASTBIT(ll mask){return (mask) & (-mask);}
int pop_cnt(ull mask){return __builtin_popcountll(mask);}
int ctz(ull mask){return __builtin_ctzll(mask);}
int logOf(ull mask){return 63 - __builtin_clzll(mask);}
 
mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rngesus(ll l, ll r){return l + (ull) rng() % (r - l + 1);}
double rngesus_d(double l, double r){
    double cur = rngesus(0, MASK(60) - 1);
    cur /= MASK(60) - 1;
    return l + cur * (r - l);
}
 
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 T>
    void printArr(T container, string separator = " ", string finish = "\n", ostream &out = cout){
        for(auto item: container) out << item << separator;
        out << finish;
    }
 
template <class T>
    void remove_dup(vector<T> &a){
        sort(ALL(a));
        a.resize(unique(ALL(a)) - a.begin());
    }

const int INF = 1e9 + 69;

pair<int, int> combine(pair<int, int> x, pair<int, int> y){
    return make_pair(min(x.first, y.first), max(x.second, y.second));
}

struct SegmentTree{
    int n;
    vector<pair<int, int>> a;

    SegmentTree(int _n){
        n = _n;
        a.resize(n * 2 + 2, {INF, -INF});
    }

    void update(int i, pair<int, int> v){
        i += n; 
        while(i > 0){
            a[i] = combine(a[i], v);
            i >>= 1;
        }
    }

    pair<int, int> get(int l, int r){
        l += n; r += n + 1;
        pair<int, int> ans = {INF, -INF};
        while(l < r){
            if (l & 1) ans = combine(ans, a[l++]);
            if (r & 1) ans = combine(ans, a[--r]);
            l >>= 1; r >>= 1;
        }
        return ans;
    }
};


struct SegmentTreeDiligent{
    int n;
    vector<pair<int, int>> a;

    SegmentTreeDiligent(int _n){
        n = _n;
        a.resize(n * 2 + 2, {INF, -INF});
    }

    pair<int,int> get(int i){
        i += n; 
        pair<int, int> ans = {INF, -INF};
        while(i > 0){
            ans = combine(ans, a[i]);
            i >>= 1;
        }
        return ans;
    }

    void update(int l, int r, pair<int, int> v){
        l += n; r += n + 1;
        while(l < r){
            if (l & 1) {
                a[l] = combine(v, a[l]);
                l++;
            }
            if (r & 1) {
                --r;
                a[r] = combine(v, a[r]);
            }
            l >>= 1; r >>= 1;
        }
    }
};

void solve(){
    int n, k; cin >> n >> k;
    int m; cin >> m;

    SegmentTreeDiligent dih(n);
    for(int i = 1; i <= n; ++i) dih.update(i, i, make_pair(i, i));

    for(int i = 0; i < m; ++i){
        int a, b; cin >> a >> b;
        if (a < b){
            int c = min(b, a + k - 1);
            dih.update(a, c, make_pair(b, b));
        }
        else{
            int c = max(b, a - k + 1);
            dih.update(c, a, make_pair(b, b));
        }
    }

    vector<pair<int,int>> arr(n+1);
    for(int i = 1; i <= n; ++i) arr[i] = dih.get(i);

    vector<SegmentTree> st;
    st.push_back(SegmentTree(n));
    for(int i = 1; i <= n; ++i) st[0].update(i, arr[i]);

    for(int j = 1; j < 20; ++j) {
        st.push_back(SegmentTree(n));
        for(int i= 1; i <= n; ++i){
            pair<int, int> range = st[j-1].get(i, i);
            st[j].update(i, st[j-1].get(range.first, range.second));

        }
    }

    int q; cin >> q;
    while(q--){
        int u, v; cin >> u >> v;
        int ans = 0;
        pair<int, int> range = {u, u};
        for(int j = 19; j >= 0; --j){
            pair<int, int> _range = st[j].get(range.first, range.second);
            if (_range.first <= v && v <= _range.second) continue;
            range = _range;
            ans += MASK(j);
        }
        ans++;
        if (ans == MASK(20)) cout << -1 << "\n";
        else cout << ans << "\n";
    }
}

int main(void){
    ios::sync_with_stdio(0);cin.tie(0); cout.tie(0);
    clock_t start = clock();

    solve();

    cerr << "Time elapsed: " << clock() - start << " ms\n";
    return 0;
}

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