oj.uz

Submission #926777

# Submission time Handle Problem Language Result Execution time Memory
926777 2024-02-13T17:30:22 Z efishel Seats (IOI18_seats) C++17
33 / 100
 1729 ms 94804 KB 
// #include "seats.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vll = vector <ll>;

#define mid ((l+r)>>1)
#define off (2*(mid-l+1))
struct SegTree {
    struct Node {
        ll minN;
        ll cou;
        bool hasL;
        ll lazy;

        Node (): minN(0), cou(1), hasL(false), lazy(0) {} // idem. lazy init

        Node operator+ (const Node& o) {
            Node ans;
            ans.minN = min(minN, o.minN);
            if (minN == o.minN) ans.cou = cou + o.cou;
            else if (minN < o.minN) ans.cou = cou;
            else ans.cou = o.cou;
            return ans;
        }
    };

    vector <Node> tree;

    SegTree (ll n): tree(2*n, Node()) {
        build(0, n-1, 0);
    }

    void push (ll l, ll r, ll id) {
        if (!tree[id].hasL) return;
        tree[id].minN += tree[id].lazy;
        if (l < r) {
            tree[id+1].lazy += tree[id].lazy;
            tree[id+1].hasL = true;
            tree[id+off].lazy += tree[id].lazy;
            tree[id+off].hasL = true;
        }
        tree[id].hasL = false;
        tree[id].lazy = 0; // 0 is idem.
    }

    void pull (ll l, ll r, ll id) {
        tree[id] = tree[id+1] + tree[id+off];
    }

    void build (ll l, ll r, ll id) {
        if (l >= r) return;
        build(l, mid, id+1);
        build(mid+1, r, id+off);
        pull(l, r, id);
    }

    void update (ll ql, ll qr, ll val, ll l, ll r, ll id) {
        push(l, r, id);
        if (qr < l || r < ql) return;
        if (ql <= l && r <= qr) {
            tree[id].lazy += val;
            tree[id].hasL = true;
            push(l, r, id);
            return;
        }
        update(ql, qr, val, l, mid, id+1);
        update(ql, qr, val, mid+1, r, id+off);
        pull(l, r, id);
    }

    ll query () {
        assert(tree[0].minN == 2);
        return tree[0].cou;
    }
};

SegTree st(0);
ll n;
vll ve2;
vll ve;

void change (ll i, ll val) {
    // border between ve[i-1] and ve[i]
    ll l = min(i>0 ? ve[i-1] : n, i<n ? ve[i] : n);
    ll r = max(i>0 ? ve[i-1] : n, i<n ? ve[i] : n)-1;
    st.update(l, r, val, 0, n-1, 0);
}

int swap_seats (int a, int b) {
    ll atA = ve2[a];
    ll atB = ve2[b];
    change(atA, -1);
    change(atA+1, -1);
    change(atB, -1);
    change(atB+1, -1);
    swap(ve2[a], ve2[b]);
    swap(ve[atA], ve[atB]);
    change(atA, 1);
    change(atA+1, 1);
    change(atB, 1);
    change(atB+1, 1);
    return int(st.query());
}

void give_initial_chart (int _, int n, vector <int> __, vector <int> ve2) {
    ::n = n;
    ::ve.resize(n);
    ::ve2.resize(n);
    for (ll i = 0; i < n; i++) {
        ve[ve2[i]] = i;
        ::ve2[i] = ve2[i];
    }
    st.tree = SegTree(n).tree;
    for (ll i = 0; i <= n; i++) {
        change(i, 1);
    }
}

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 604 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #2
0 / 6.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 604 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #3
0 / 20.0

# Verdict Execution time Memory Grader output
1 Runtime error 148 ms 16576 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #4
0 / 6.0

# Verdict Execution time Memory Grader output
1 Runtime error 3 ms 860 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #5
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 1236 KB Output is correct
2 Correct 51 ms 1228 KB Output is correct
3 Correct 81 ms 1444 KB Output is correct
4 Correct 102 ms 1440 KB Output is correct
5 Correct 191 ms 2328 KB Output is correct
6 Correct 701 ms 94548 KB Output is correct
7 Correct 856 ms 94544 KB Output is correct
8 Correct 662 ms 94548 KB Output is correct
9 Correct 1729 ms 94764 KB Output is correct
10 Correct 653 ms 94804 KB Output is correct
11 Correct 622 ms 94548 KB Output is correct
12 Correct 596 ms 94760 KB Output is correct

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 604 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -