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Submission #1033775

# Submission time Handle Problem Language Result Execution time Memory
1033775 2024-07-25T05:50:20 Z 정민찬(#10972) Fire (BOI24_fire) C++17
13 / 100
 192 ms 18508 KB 
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> pll;

struct SegmentTree{
    vector<int> tree;
    void init(int n) {
        int sz = 1 << __lg(n-1) + 2;
        tree.assign(sz, -1);
    }
    void update(int node, int s, int e, int tar, int val) {
        if (s > tar || tar > e) return;
        if (s == e) {
            tree[node] = val;
            return;
        }
        int mid = s + e >> 1;
        update(node*2, s, mid, tar, val);
        update(node*2+1, mid+1, e, tar, val);
        tree[node] = max(tree[node*2], tree[node*2+1]);
    }
    int query(int node, int s, int e, int l, int r) {
        if (l > e || s > r) return -1;
        if (l <= s && e <= r) return tree[node];
        int mid = s + e >> 1;
        return max(query(node*2, s, mid, l, r), query(node*2+1, mid+1, e, l, r));
    }
};

SegmentTree seg;

int main() {
    ios_base :: sync_with_stdio(false); cin.tie(NULL);
    int n, m;
    cin >> n >> m;
    vector<pair<int,int>> a(n);
    for (int i=0; i<n; i++) {
        cin >> a[i].first >> a[i].second;
        if (a[i].first > a[i].second) a[i].second += m;
    }
    sort(a.begin(), a.end(), [&] (pair<int,int> &u, pair<int,int> &v) {
        if (u.first == v.first) return u.second > v.second;
        return u.first < v.first;
    });
    vector<pair<int,int>> t = {a[0]};
    int mx = a[0].second;
    for (int i=1; i<n; i++) {
        if (a[i].second > mx) {
            t.push_back(a[i]);
            mx = a[i].second;
        }
    }
    a = t;
    n = a.size();
    vector<int> d;
    for (int i=0; i<n; i++) {
        d.push_back(a[i].first);
        d.push_back(a[i].second);
    }
    sort(d.begin(), d.end());
    d.erase(unique(d.begin(), d.end()), d.end());
    for (int i=0; i<n; i++) {
        a[i].first = lower_bound(d.begin(), d.end(), a[i].first) - d.begin() + 1;
        a[i].second = lower_bound(d.begin(), d.end(), a[i].second) - d.begin() + 1;
    }
    int M = d.size();
    seg.init(M);
    set<int> s;
    for (int i=0; i<n; i++) {
        s.insert(i);
        seg.update(1, 1, M, a[i].first, i);
    }
    int ans = 1e9;
    while (!s.empty()) {
        int x = *s.begin();
        s.erase(s.begin());
        seg.update(1, 1, M, a[x].first, -1);
        bool flag = true;
        int cnt = 1;
        int st = a[x].first;
        while (true) {
            int nxt = seg.query(1, 1, M, 1, a[x].second);
            if (nxt == -1 || a[nxt].second <= a[x].second) {
                flag = false;
                break;
            }
            s.erase(nxt);
            seg.update(1, 1, M, a[nxt].first, -1);
            x = nxt;
            cnt ++;

            if (d[a[nxt].second-1] - d[st-1] >= m) break;
        }
        if (!flag) break;
        ans = min(ans, cnt);
    }
    if (ans == 1e9) cout << "-1\n";
    else cout << ans << '\n';   
}

Compilation message

Main.cpp: In member function 'void SegmentTree::init(int)':
Main.cpp:11:33: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
   11 |         int sz = 1 << __lg(n-1) + 2;
      |                       ~~~~~~~~~~^~~
Main.cpp: In member function 'void SegmentTree::update(int, int, int, int, int)':
Main.cpp:20:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   20 |         int mid = s + e >> 1;
      |                   ~~^~~
Main.cpp: In member function 'int SegmentTree::query(int, int, int, int, int)':
Main.cpp:28:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   28 |         int mid = s + e >> 1;
      |                   ~~^~~

Subtask #1
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Incorrect 0 ms 348 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Incorrect 0 ms 348 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Incorrect 0 ms 348 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 376 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 344 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 3 ms 860 KB Output is correct
16 Correct 3 ms 860 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 3 ms 860 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 19 ms 1884 KB Output is correct
21 Correct 49 ms 3932 KB Output is correct
22 Correct 46 ms 3664 KB Output is correct
23 Correct 139 ms 16456 KB Output is correct
24 Correct 112 ms 15688 KB Output is correct
25 Correct 44 ms 1884 KB Output is correct
26 Correct 87 ms 10068 KB Output is correct
27 Correct 137 ms 16352 KB Output is correct
28 Correct 45 ms 3156 KB Output is correct

Subtask #5
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 360 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 3 ms 860 KB Output is correct
13 Correct 3 ms 860 KB Output is correct
14 Correct 3 ms 860 KB Output is correct
15 Correct 19 ms 1884 KB Output is correct
16 Correct 141 ms 16484 KB Output is correct
17 Incorrect 192 ms 18508 KB Output isn't correct
18 Halted 0 ms 0 KB -

Subtask #6
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Incorrect 0 ms 348 KB Output isn't correct
4 Halted 0 ms 0 KB -