Submission #1029099

#	Time	Username	Problem	Language	Result	Execution time	Memory
1029099		atom	Osumnjičeni (COCI21_osumnjiceni)	C++17	110 / 110	495 ms	38336 KiB

Main

#include "bits/stdc++.h"
// @JASPER'S BOILERPLATE
using namespace std;
using ll = long long;

#ifdef JASPER
#include "debug.h"
#else
#define debug(...) 166
#endif

struct LazySegmentTree {
    vector <int> lzy, f;
    int n;
    LazySegmentTree(int _n) {
        n = _n;
        lzy.resize(n * 4 + 5, 0);
        f.resize(n * 4 + 5, 0);
    }

    int merge(int x, int y) { return max(x, y); }

    void push(int x, int l, int r) {
        if (lzy[x] == 0) return;
        int val = lzy[x];

        f[x << 1] += val;
        lzy[x << 1] += val;

        f[x << 1 | 1] += val;
        lzy[x << 1 | 1] += val;

        lzy[x] = 0;
        return;
    }

    void upd(int x, int l, int r, int u, int v, int val) {
        if (l > v || r < u) return;
        if (u <= l && r <= v) {
            f[x] += val;
            lzy[x] += val;
            return;
        }
        int m = (l + r) / 2;
        push(x, l, r);
        upd(x << 1, l, m, u, v, val);
        upd(x << 1 | 1, m + 1, r, u, v, val);
        f[x] = merge(f[x << 1], f[x << 1 | 1]);
    }

    void upd(int l, int r, int val) { upd(1, 1, n, l, r, val); }

    int qry(int x, int l, int r, int u, int v) {
        if (l > v || r < u) return 0;
        if (u <= l && r <= v) return f[x];
        int m = (l + r) / 2;
        push(x, l, r);
        int ql = qry(x << 1, l, m, u, v);
        int qr = qry(x << 1 | 1, m + 1, r, u, v);
        return merge(ql, qr); 
    }

    int qry(int l, int r) { return qry(1, 1, n, l, r); }
};

const int LG = 18;

signed main() {
    cin.tie(0) -> sync_with_stdio(0);
    
    #ifdef JASPER
        freopen("in1", "r", stdin);
    #endif

    vector <int> vals;
    int n, q;
    cin >> n;
    vector <pair <int, int>> segs(n + 1);
    for (int i = 1; i <= n; ++i) {
        cin >> segs[i].first >> segs[i].second;
        vals.push_back(segs[i].first);
        vals.push_back(segs[i].second);
    }

    sort(vals.begin(), vals.end());
    vals.resize(unique(vals.begin(), vals.end()) - vals.begin());

    for (int i = 1; i <= n; ++i) {
        segs[i].first = (int) (lower_bound(vals.begin(), vals.end(), segs[i].first) - vals.begin() + 1);
        segs[i].second = (int) (lower_bound(vals.begin(), vals.end(), segs[i].second) - vals.begin() + 1);
    }

    LazySegmentTree st((int) vals.size());

    vector <int> nxt(n + 1, 0);
    int j = 1;
    for (int i = 1; i <= n; ++i) {
        while (j <= n && st.qry(segs[j].first, segs[j].second) == 0) {
            st.upd(segs[j].first, segs[j].second, 1);
            ++j;
        }
        nxt[i] = j;
        st.upd(segs[i].first, segs[i].second, -1);
    }

    debug(nxt);
    vector <vector <int>> up(LG, vector <int> (n + 5, 0));
    // up(i, j) = nxt(..nxt(i)), use nxt() j times
    for (int i = 1; i <= n; ++i)
        up[0][i] = nxt[i];
    up[0][n + 1] = n + 1;

    for (int _j = 1; _j < LG; ++_j)
        for (int i = 1; i <= n + 1; ++i)
            up[_j][i] = up[_j - 1][up[_j - 1][i]];

    cin >> q;
    for (int _q = 1; _q <= q; ++_q) {
        int l, r;
        cin >> l >> r;
        
        int res = 1;
        for (int i = LG - 1; i >= 0; --i) {
            if (up[i][l] <= r) {
                l = up[i][l];
                res += (1 << i);
            }
        }
        cout << res << "\n";
    } 

    
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:9:20: warning: statement has no effect [-Wunused-value]
    9 | #define debug(...) 166
      |                    ^~~
Main.cpp:106:5: note: in expansion of macro 'debug'
  106 |     debug(nxt);
      |     ^~~~~

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