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Submission #993379

# Submission time Handle Problem Language Result Execution time Memory
993379 2024-06-05T14:23:03 Z vladilius Fire (BOI24_fire) C++17
40 / 100
 23 ms 4208 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
#define pb push_back
#define ff first
#define ss second
#define ins insert

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    
    int n, m; cin>>n>>m;
    vector<int> l(n + 1), r(n + 1);
    for (int i = 1; i <= n; i++){
        cin>>l[i]>>r[i];
        if (!r[i]) r[i] = m;
        else r[i]--;
        if (l[i] > r[i]){
            r[i] += m;
        }
    }
    
    vector<pii> all;
    for (int i = 1; i <= n; i++){
        all.pb({l[i], r[i]});
    }
    sort(all.begin(), all.end());
    vector<pii> tmp;
    int i = 0;
    while (i < n){
        int j = i;
        while (j < n && all[i].ff == all[j].ff){
            j++;
        }
        tmp.pb({all[j - 1].ss, all[j - 1].ff});
        i = j;
    }
    all = tmp;
    sort(all.begin(), all.end());
    tmp.clear();
    i = 0;
    while (i < all.size()){
        int j = i;
        while (j < all.size() && all[i].ff == all[j].ff){
            j++;
        }
        tmp.pb({all[i].ss, all[i].ff});
        i = j;
    }
    all = tmp;
    
    
    sort(all.begin(), all.end());
    n = (int) all.size();
    vector<int> log(n + 1);
    for (int i = 2; i <= n; i++){
        log[i] = log[i / 2] + 1;
    }
    const int lg = log[n];
    vector<vector<pii>> sp(n, vector<pii>(lg + 1));
    for (int i = 0; i < n; i++){
        sp[i][0] = {all[i].ss, i};
    }
    for (int k = 1; k <= lg; k++){
        for (int i = 0; i + (1 << k) <= n; i++){
            sp[i][k] = max(sp[i][k - 1], sp[i + (1 << (k - 1))][k - 1]);
        }
    }
    
    auto get = [&](int l, int r){
        int k = log[r - l + 1];
        return max(sp[l][k], sp[r - (1 << k) + 1][k]);
    };
    
    vector<int> ls;
    for (int i = 0; i < n; i++){
        ls.pb(all[i].ff);
    }
    vector<int> :: iterator it1, it2;
    
    vector<int> g(n);
    for (int i = 0; i < n; i++){
        auto &[l, r] = all[i];
        it1 = lower_bound(ls.begin(), ls.end(), l);
        it2 = upper_bound(ls.begin(), ls.end(), r + 1); it2--;
        int lb = max(i + 1, (int) (it1 - ls.begin())), rb = (int) (it2 - ls.begin());
        if (lb > rb){
            g[i] = -1;
            continue;
        }
        g[i] = get(lb, rb).ss;
        if (all[g[i]].ss <= r) g[i] = -1;
    }
    
    /*
    int out = n + 1;
    for (int i = 0; i < n; i++){
        int j = i, cnt = 1, rr = all[i].ff + m - 1;
        while (j != -1 && all[j].ss < rr){
            j = g[j];
            cnt++;
        }
        if (j != -1) out = min(out, cnt);
    }
    
    cout<<((out > n) ? -1 : out)<<"\n";
     */
    
    vector<vector<int>> pw(n, vector<int>(lg + 1, -1));
    for (int i = 0; i < n; i++){
        pw[i][0] = g[i];
    }
    for (int k = 1; k <= lg; k++){
        for (int i = 0; i + (1 << k) <= n; i++){
            if (pw[i][k - 1] == -1) continue;
            pw[i][k] = pw[pw[i][k - 1]][k - 1];
        }
    }
    
    int ans = n + 1;
    for (int i = 0; i < n; i++){
        int rr = all[i].ff + m - 1, j = i, out = 1;
        for (int k = lg; k >= 0; k--){
            int v = pw[j][k];
            if (v != -1 && all[v].ss <= rr){
                j = v;
                out += (1 << k);
            }
        }
        while (j != -1 && all[j].ss < rr){
            j = g[j]; out++;
        }
        if (j != -1) ans = min(ans, out);
    }
    cout<<((ans > n) ? -1 : ans)<<"\n";
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:45:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |     while (i < all.size()){
      |            ~~^~~~~~~~~~~~
Main.cpp:47:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |         while (j < all.size() && all[i].ff == all[j].ff){
      |                ~~^~~~~~~~~~~~

Subtask #1
14.0 / 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 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 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 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 600 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct

Subtask #2
17.0 / 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 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 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 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 600 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 392 KB Output is correct
26 Correct 1 ms 344 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 0 ms 348 KB Output is correct
31 Correct 0 ms 348 KB Output is correct
32 Correct 1 ms 348 KB Output is correct
33 Correct 1 ms 348 KB Output is correct
34 Correct 0 ms 348 KB Output is correct
35 Correct 1 ms 348 KB Output is correct
36 Correct 0 ms 348 KB Output is correct
37 Correct 0 ms 348 KB Output is correct
38 Correct 0 ms 348 KB Output is correct

Subtask #3
9.0 / 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 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 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 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 600 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 392 KB Output is correct
26 Correct 1 ms 344 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 0 ms 348 KB Output is correct
31 Correct 0 ms 348 KB Output is correct
32 Correct 1 ms 348 KB Output is correct
33 Correct 1 ms 348 KB Output is correct
34 Correct 0 ms 348 KB Output is correct
35 Correct 1 ms 348 KB Output is correct
36 Correct 0 ms 348 KB Output is correct
37 Correct 0 ms 348 KB Output is correct
38 Correct 0 ms 348 KB Output is correct
39 Correct 4 ms 1628 KB Output is correct
40 Correct 3 ms 1624 KB Output is correct
41 Correct 4 ms 1628 KB Output is correct
42 Correct 3 ms 1628 KB Output is correct
43 Correct 2 ms 1116 KB Output is correct
44 Correct 4 ms 1628 KB Output is correct
45 Correct 3 ms 1628 KB Output is correct
46 Correct 3 ms 1628 KB Output is correct
47 Correct 3 ms 1624 KB Output is correct
48 Correct 3 ms 1628 KB Output is correct
49 Correct 3 ms 1624 KB Output is correct
50 Correct 3 ms 1628 KB Output is correct

Subtask #4
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 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 1 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 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 1628 KB Output is correct
16 Correct 3 ms 1628 KB Output is correct
17 Correct 2 ms 1236 KB Output is correct
18 Correct 5 ms 1624 KB Output is correct
19 Correct 3 ms 1628 KB Output is correct
20 Incorrect 23 ms 4208 KB Output isn't correct
21 Halted 0 ms 0 KB -

Subtask #5
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 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 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 3 ms 1628 KB Output is correct
13 Correct 3 ms 1628 KB Output is correct
14 Correct 3 ms 1624 KB Output is correct
15 Incorrect 22 ms 4200 KB Output isn't correct
16 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 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 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 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 600 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 392 KB Output is correct
26 Correct 1 ms 344 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 0 ms 348 KB Output is correct
31 Correct 0 ms 348 KB Output is correct
32 Correct 1 ms 348 KB Output is correct
33 Correct 1 ms 348 KB Output is correct
34 Correct 0 ms 348 KB Output is correct
35 Correct 1 ms 348 KB Output is correct
36 Correct 0 ms 348 KB Output is correct
37 Correct 0 ms 348 KB Output is correct
38 Correct 0 ms 348 KB Output is correct
39 Correct 4 ms 1628 KB Output is correct
40 Correct 3 ms 1624 KB Output is correct
41 Correct 4 ms 1628 KB Output is correct
42 Correct 3 ms 1628 KB Output is correct
43 Correct 2 ms 1116 KB Output is correct
44 Correct 4 ms 1628 KB Output is correct
45 Correct 3 ms 1628 KB Output is correct
46 Correct 3 ms 1628 KB Output is correct
47 Correct 3 ms 1624 KB Output is correct
48 Correct 3 ms 1628 KB Output is correct
49 Correct 3 ms 1624 KB Output is correct
50 Correct 3 ms 1628 KB Output is correct
51 Correct 0 ms 348 KB Output is correct
52 Correct 1 ms 348 KB Output is correct
53 Correct 0 ms 348 KB Output is correct
54 Correct 0 ms 348 KB Output is correct
55 Correct 1 ms 348 KB Output is correct
56 Correct 1 ms 348 KB Output is correct
57 Correct 1 ms 348 KB Output is correct
58 Correct 0 ms 348 KB Output is correct
59 Correct 0 ms 348 KB Output is correct
60 Correct 0 ms 348 KB Output is correct
61 Correct 0 ms 348 KB Output is correct
62 Correct 0 ms 348 KB Output is correct
63 Correct 1 ms 348 KB Output is correct
64 Correct 1 ms 348 KB Output is correct
65 Correct 3 ms 1628 KB Output is correct
66 Correct 3 ms 1628 KB Output is correct
67 Correct 2 ms 1236 KB Output is correct
68 Correct 5 ms 1624 KB Output is correct
69 Correct 3 ms 1628 KB Output is correct
70 Incorrect 23 ms 4208 KB Output isn't correct
71 Halted 0 ms 0 KB -