Submission #854309

#	Time	Username	Problem	Language	Result	Execution time	Memory
854309		MisterReaper	Osumnjičeni (COCI21_osumnjiceni)	C++17	110 / 110	338 ms	40528 KiB

Main

//author: Ahmet Alp Orakci
#include <bits/stdc++.h>
using namespace std;
using i64 = long long;

bool intersect(int l1, int l2, int r1, int r2) {
    if(l2 < r1 || r2 < l1)
        return false;
    return true;
}

#define ONLINE_JUDGE
void solve() {
    int n;
    cin >> n;

    vector <array <int, 2>> vec(n +1);
    for(int i = 1; i <= n; i++) {
        cin >> vec[i][0] >> vec[i][1];
    }

    vector <vector <int>> bl(n +2);
    for(int i = 1; i <= n +1; i++)
        bl[i].resize(21);

    multiset <pair <int, int>> ms;

    int l = 1, r = 1;
    ms.emplace(vec[l][0], vec[l][1]);
    while(l <= n) {
        if(r < l) {
            ms.emplace(vec[l][0], vec[l][1]);
            r++;
            continue;
        }

        auto ok = [&](int x) -> bool {
            bool res = true;
            auto it = ms.lower_bound({vec[x][0], 0});
            if(it != ms.end()) {
                auto [a, b] = *it;
                res &= !intersect(a, b, vec[x][0], vec[x][1]);
            }

            if(it != ms.begin()) {
                auto [a, b] = *prev(it);
                res &= !intersect(a, b, vec[x][0], vec[x][1]);
            }

            return res;
        };

        while(r +1 <= n && ok(r +1)) {
            r++;
            ms.emplace(vec[r][0], vec[r][1]);
        }

        //cerr << l << " " << r << "\n";
        bl[l][0] = r +1;
        ms.erase(ms.find({vec[l][0], vec[l][1]}));
        l++;
    }

    bl[n +1][0] = n +1;

    for(int i = 1; i < 21; i++) {
        for(int j = 1; j <= n +1; j++) {
            bl[j][i] = bl[bl[j][i -1]][i -1];
        }
    }

    auto get = [&](int l, int r) -> int {
        int res = 0;
        for(int i = 20; i >= 0; i--) {
            if(bl[l][i] <= r) {
                l = bl[l][i];
                res += (1 << i);
            }
        }

        return res +1;
    };

    int q;
    cin >> q;
    
    while(q--) {
        int l, r;
        cin >> l >> r;
        cout << get(l, r) << "\n";
    }
    
    return;
}

signed main() {
    #ifndef ONLINE_JUDGE
        freopen(".in", "r", stdin);
        freopen(".out", "w", stdout);
    #endif

    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);

    int t = 1; //cin >> t;
    for(int i = 1; i <= t; i++) {
        solve();
    }

    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 20 / 20
• Subtask 4: 20 / 20
• Subtask 5: 50 / 50