oj.uz

Submission #816299

# Submission time Handle Problem Language Result Execution time Memory
816299 2023-08-09T04:43:36 Z 이동현(#10127) Marshmallow Molecules (CCO19_day2problem2) C++17
25 / 25
 94 ms 20336 KB 
#include <bits/stdc++.h>
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#define int long long
using namespace std;

struct Dsu{
    int n;
    vector<int> pr;
    vector<set<int>> st;

    Dsu(int m){
        n = m + 4;
        pr.resize(n);
        st.resize(n);
        iota(pr.begin(), pr.end(), 0);
    }

    int fd(int x){
        return x == pr[x] ? x : pr[x] = fd(pr[x]);
    }

    void unite(int x, int y){
        x = fd(x), y = fd(y);
        if(x == y) return;

        if((int)st[x].size() < (int)st[y].size()){
            swap(x, y);
        }

        while((int)st[y].size()){
            st[x].insert(*st[y].begin());
            st[y].erase(st[y].begin());
        }

        pr[y] = x;
    }
};

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    int n, m;
    cin >> n >> m;
    vector<vector<int>> r(n), l(n);
    for(int i = 0; i < m; ++i){
        int x, y;
        cin >> x >> y;
        --x, --y;
        r[x].push_back(y);
        l[y].push_back(x);
    }

    Dsu gr(n);
    for(int i = 0; i < n; ++i){
        for(auto&nxt:r[i]){
            gr.st[i].insert(nxt);
        }
    }

    int ans = 0;
    for(int i = 0; i < n; ++i){
        for(auto&nxt:l[i]){
            gr.unite(nxt, i);
        }

        // cout << i << endl;

        int rt = gr.fd(i);
        while(gr.st[rt].size() && *gr.st[rt].begin() <= i){
            gr.st[rt].erase(gr.st[rt].begin());
        }

        ans += (int)gr.st[rt].size();
    }

    cout << ans << '\n';
    
    return 0;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 2 ms 716 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 1 ms 468 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 1 ms 340 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 2 ms 716 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 1 ms 468 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 41 ms 7928 KB Output is correct
17 Correct 43 ms 7772 KB Output is correct
18 Correct 35 ms 7724 KB Output is correct
19 Correct 36 ms 7828 KB Output is correct
20 Correct 47 ms 7924 KB Output is correct
21 Correct 3 ms 1236 KB Output is correct
22 Correct 50 ms 7968 KB Output is correct
23 Correct 50 ms 7744 KB Output is correct
24 Correct 38 ms 7764 KB Output is correct
25 Correct 56 ms 7896 KB Output is correct
26 Correct 38 ms 7848 KB Output is correct
27 Correct 3 ms 1236 KB Output is correct

Subtask #3
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 86 ms 19636 KB Output is correct
2 Correct 84 ms 20176 KB Output is correct
3 Correct 94 ms 20320 KB Output is correct
4 Correct 82 ms 19592 KB Output is correct
5 Correct 85 ms 20196 KB Output is correct
6 Correct 67 ms 20300 KB Output is correct
7 Correct 71 ms 19668 KB Output is correct
8 Correct 94 ms 20128 KB Output is correct
9 Correct 78 ms 20336 KB Output is correct
10 Correct 64 ms 19660 KB Output is correct
11 Correct 82 ms 20188 KB Output is correct
12 Correct 70 ms 20324 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 2 ms 716 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 1 ms 468 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 41 ms 7928 KB Output is correct
17 Correct 43 ms 7772 KB Output is correct
18 Correct 35 ms 7724 KB Output is correct
19 Correct 36 ms 7828 KB Output is correct
20 Correct 47 ms 7924 KB Output is correct
21 Correct 3 ms 1236 KB Output is correct
22 Correct 50 ms 7968 KB Output is correct
23 Correct 50 ms 7744 KB Output is correct
24 Correct 38 ms 7764 KB Output is correct
25 Correct 56 ms 7896 KB Output is correct
26 Correct 38 ms 7848 KB Output is correct
27 Correct 3 ms 1236 KB Output is correct
28 Correct 86 ms 19636 KB Output is correct
29 Correct 84 ms 20176 KB Output is correct
30 Correct 94 ms 20320 KB Output is correct
31 Correct 82 ms 19592 KB Output is correct
32 Correct 85 ms 20196 KB Output is correct
33 Correct 67 ms 20300 KB Output is correct
34 Correct 71 ms 19668 KB Output is correct
35 Correct 94 ms 20128 KB Output is correct
36 Correct 78 ms 20336 KB Output is correct
37 Correct 64 ms 19660 KB Output is correct
38 Correct 82 ms 20188 KB Output is correct
39 Correct 70 ms 20324 KB Output is correct
40 Correct 60 ms 8420 KB Output is correct
41 Correct 68 ms 8416 KB Output is correct
42 Correct 86 ms 12004 KB Output is correct
43 Correct 68 ms 12016 KB Output is correct
44 Correct 68 ms 18008 KB Output is correct
45 Correct 67 ms 17948 KB Output is correct
46 Correct 49 ms 13132 KB Output is correct
47 Correct 51 ms 13032 KB Output is correct
48 Correct 61 ms 18472 KB Output is correct
49 Correct 52 ms 18344 KB Output is correct
50 Correct 75 ms 19688 KB Output is correct
51 Correct 81 ms 20184 KB Output is correct
52 Correct 80 ms 20336 KB Output is correct
53 Correct 79 ms 19152 KB Output is correct
54 Correct 72 ms 19220 KB Output is correct
55 Correct 72 ms 18132 KB Output is correct
56 Correct 58 ms 18400 KB Output is correct
57 Correct 50 ms 19004 KB Output is correct