oj.uz

Submission #930398

# Submission time Handle Problem Language Result Execution time Memory
930398 2024-02-19T14:35:55 Z boris_mihov Making Friends on Joitter is Fun (JOI20_joitter2) C++17
100 / 100
 1283 ms 229460 KB 
#include <algorithm>
#include <iostream>
#include <numeric>
#include <cassert>
#include <vector>
#include <queue>
#include <set>
#include <map>

typedef long long llong;
const int MAXN = 100000 + 10;
const int MAXM = 300000 + 10;
const int MOD = 1e9 + 7;

int n, m;
llong answer;
struct DSU
{
    int sz[MAXN];
    int par[MAXN];
    std::map <int,int> fromComp[MAXN];
    std::set <int> pointingNodes[MAXN];
    std::set <int> fromNode[MAXN];
    std::set <int> nodes[MAXN];

    void build()
    {
        std::fill(sz + 1, sz + 1 + n, 1);
        std::iota(par + 1, par + 1 + n, 1);
        for (int i = 1 ; i <= n ; ++i)
        {
            nodes[i].insert(i);
        }
    }

    int find(int node)
    {
        if (par[node] == node) return node;
        return par[node] = find(par[node]);
    }

    void merge(int cU, int cV)
    {
        cU = find(cU);
        cV = find(cV);
        if (cU == cV)
        {
            return;
        }

        answer -= 1LL * fromComp[cV][cU] * nodes[cU].size();
        answer -= 1LL * fromComp[cU][cV] * nodes[cV].size();
        answer += 2LL * nodes[cU].size() * nodes[cV].size();

        if (nodes[cV].size() > nodes[cU].size())
        {
            std::swap(cV, cU);
        }

        // std::cout << "merge: " << cU << ' ' << cV << '\n';
        std::queue <int> waitlist;
        for (const int &node : pointingNodes[cV])
        {
            if (nodes[cU].count(node))
            {
                waitlist.push(node);
            }
        }

        for (const int &node : nodes[cV])
        {
            if (fromNode[node].count(cU))
            {
                // std::cout << "erase1: " << node << "\n";
                pointingNodes[cU].erase(pointingNodes[cU].find(node));
                fromNode[node].erase(fromNode[node].find(cU));
            }
        }

        fromComp[cU][cV] = 0;
        fromComp[cV][cU] = 0;
        while (waitlist.size())
        {
            // std::cout << "erase2\n";
            pointingNodes[cV].erase(pointingNodes[cV].find(waitlist.front()));
            waitlist.pop();
        }

        std::queue <std::pair <int,int>> toMerge;
        for (const int &node : pointingNodes[cV])
        {
            if (fromComp[cU][find(node)] > 0)
            {
                toMerge.push({cU, find(node)});
            }
        }

        for (const auto &[key, value] : fromComp[cV])
        {
            if (value > 0 && fromComp[key][cU] > 0)
            {
                toMerge.push({cU, key});
            }
        }

        answer -= 1LL * nodes[cV].size() * pointingNodes[cV].size();
        for (const int &node : pointingNodes[cV])
        {
            fromNode[node].erase(fromNode[node].find(cV));
            fromComp[find(node)][cV]--;

            bool inserted = pointingNodes[cU].insert(node).second;
            if (inserted) 
            {
                answer += nodes[cU].size();
                fromNode[node].insert(cU);
                // std::cout << "add: " << find(node) << ' ' << cU << '\n';
                fromComp[find(node)][cU]++;
            }
        }
        
        answer += 1LL * pointingNodes[cU].size() * nodes[cV].size();
        for (const auto &[key, value] : fromComp[cV])
        {
            // std::cout << "add: " << cU << ' ' << key << ' ' << value << '\n';
            fromComp[cU][key] += value;
        }

        for (const int &node : nodes[cV])
        {
            nodes[cU].insert(node);
        }

        par[cV] = cU;
        while (toMerge.size())
        {
            merge(toMerge.front().first, toMerge.front().second);
            toMerge.pop();
        }
    }

    void addEdge(int u, int v)
    {
        int cU = find(u);
        int cV = find(v);
        if (cU == cV) 
        {
            return;
        }

        // std::cout << "add edge: " << u << ' ' << cV << '\n';
        if (fromNode[u].count(cV))
        {
            return;
        }

        if (fromComp[cV][cU] == 0)
        {
            answer += nodes[cV].size();
            pointingNodes[cV].insert(u);
            fromNode[u].insert(cV);
            fromComp[cU][cV]++;
            return;
        }
        
        // assert(fromComp[cU][cV] == 0);
        merge(cU, cV);
    }
};

DSU dsu;
int from[MAXM];
int to[MAXM];
void solve()
{
    dsu.build();
    for (int i = 1 ; i <= m ; ++i)
    {
        dsu.addEdge(from[i], to[i]);
        std::cout << answer << '\n';
    }
}

void input()
{
    std::cin >> n >> m;
    for (int i = 1 ; i <= m ; ++i)
    {
        std::cin >> from[i] >> to[i];
    }
}

void fastIOI()
{
    std::ios_base :: sync_with_stdio(0);
    std::cout.tie(nullptr);
    std::cin.tie(nullptr);
}

int main()
{
    fastIOI();
    input();
    solve();

    return 0;
}

/*
14 13
10 14
3 10
14 13
1 3
3 5
3 11
12 14
14 6
11 8
2 3
7 8
9 7
1 4

5 6
4 2
1 5
2 3
2 5
3 2
3 1
*/

Subtask #1
1.0 / 1.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 22104 KB Output is correct
2 Correct 6 ms 22108 KB Output is correct
3 Correct 5 ms 22108 KB Output is correct
4 Correct 6 ms 22108 KB Output is correct
5 Correct 6 ms 22108 KB Output is correct
6 Correct 5 ms 22212 KB Output is correct
7 Correct 6 ms 22108 KB Output is correct
8 Correct 7 ms 22108 KB Output is correct
9 Correct 6 ms 22108 KB Output is correct
10 Correct 6 ms 22108 KB Output is correct
11 Correct 7 ms 22108 KB Output is correct
12 Correct 5 ms 22108 KB Output is correct
13 Correct 6 ms 22108 KB Output is correct
14 Correct 5 ms 22108 KB Output is correct
15 Correct 6 ms 22224 KB Output is correct
16 Correct 5 ms 22108 KB Output is correct
17 Correct 5 ms 22108 KB Output is correct
18 Correct 5 ms 22108 KB Output is correct
19 Correct 5 ms 22108 KB Output is correct
20 Correct 6 ms 22180 KB Output is correct
21 Correct 6 ms 22108 KB Output is correct
22 Correct 6 ms 22204 KB Output is correct
23 Correct 6 ms 22108 KB Output is correct
24 Correct 5 ms 22216 KB Output is correct
25 Correct 6 ms 22108 KB Output is correct
26 Correct 5 ms 22108 KB Output is correct
27 Correct 6 ms 22108 KB Output is correct
28 Correct 7 ms 22360 KB Output is correct
29 Correct 6 ms 22108 KB Output is correct
30 Correct 5 ms 22196 KB Output is correct
31 Correct 5 ms 22220 KB Output is correct
32 Correct 5 ms 22196 KB Output is correct
33 Correct 6 ms 22108 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 22104 KB Output is correct
2 Correct 6 ms 22108 KB Output is correct
3 Correct 5 ms 22108 KB Output is correct
4 Correct 6 ms 22108 KB Output is correct
5 Correct 6 ms 22108 KB Output is correct
6 Correct 5 ms 22212 KB Output is correct
7 Correct 6 ms 22108 KB Output is correct
8 Correct 7 ms 22108 KB Output is correct
9 Correct 6 ms 22108 KB Output is correct
10 Correct 6 ms 22108 KB Output is correct
11 Correct 7 ms 22108 KB Output is correct
12 Correct 5 ms 22108 KB Output is correct
13 Correct 6 ms 22108 KB Output is correct
14 Correct 5 ms 22108 KB Output is correct
15 Correct 6 ms 22224 KB Output is correct
16 Correct 5 ms 22108 KB Output is correct
17 Correct 5 ms 22108 KB Output is correct
18 Correct 5 ms 22108 KB Output is correct
19 Correct 5 ms 22108 KB Output is correct
20 Correct 6 ms 22180 KB Output is correct
21 Correct 6 ms 22108 KB Output is correct
22 Correct 6 ms 22204 KB Output is correct
23 Correct 6 ms 22108 KB Output is correct
24 Correct 5 ms 22216 KB Output is correct
25 Correct 6 ms 22108 KB Output is correct
26 Correct 5 ms 22108 KB Output is correct
27 Correct 6 ms 22108 KB Output is correct
28 Correct 7 ms 22360 KB Output is correct
29 Correct 6 ms 22108 KB Output is correct
30 Correct 5 ms 22196 KB Output is correct
31 Correct 5 ms 22220 KB Output is correct
32 Correct 5 ms 22196 KB Output is correct
33 Correct 6 ms 22108 KB Output is correct
34 Correct 8 ms 22512 KB Output is correct
35 Correct 66 ms 29780 KB Output is correct
36 Correct 90 ms 34884 KB Output is correct
37 Correct 87 ms 34920 KB Output is correct
38 Correct 84 ms 34508 KB Output is correct
39 Correct 8 ms 22816 KB Output is correct
40 Correct 11 ms 23388 KB Output is correct
41 Correct 10 ms 23244 KB Output is correct
42 Correct 8 ms 22620 KB Output is correct
43 Correct 8 ms 22732 KB Output is correct
44 Correct 9 ms 22620 KB Output is correct
45 Correct 8 ms 22620 KB Output is correct
46 Correct 8 ms 22620 KB Output is correct
47 Correct 10 ms 23132 KB Output is correct
48 Correct 10 ms 23132 KB Output is correct
49 Correct 18 ms 25120 KB Output is correct
50 Correct 90 ms 35152 KB Output is correct
51 Correct 12 ms 23128 KB Output is correct
52 Correct 74 ms 32736 KB Output is correct
53 Correct 17 ms 24668 KB Output is correct
54 Correct 81 ms 33780 KB Output is correct
55 Correct 11 ms 23128 KB Output is correct
56 Correct 11 ms 23132 KB Output is correct
57 Correct 13 ms 26352 KB Output is correct
58 Correct 13 ms 26204 KB Output is correct
59 Correct 10 ms 23388 KB Output is correct
60 Correct 58 ms 28384 KB Output is correct
61 Correct 10 ms 23128 KB Output is correct
62 Correct 84 ms 34244 KB Output is correct

Subtask #3
83.0 / 83.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 22104 KB Output is correct
2 Correct 6 ms 22108 KB Output is correct
3 Correct 5 ms 22108 KB Output is correct
4 Correct 6 ms 22108 KB Output is correct
5 Correct 6 ms 22108 KB Output is correct
6 Correct 5 ms 22212 KB Output is correct
7 Correct 6 ms 22108 KB Output is correct
8 Correct 7 ms 22108 KB Output is correct
9 Correct 6 ms 22108 KB Output is correct
10 Correct 6 ms 22108 KB Output is correct
11 Correct 7 ms 22108 KB Output is correct
12 Correct 5 ms 22108 KB Output is correct
13 Correct 6 ms 22108 KB Output is correct
14 Correct 5 ms 22108 KB Output is correct
15 Correct 6 ms 22224 KB Output is correct
16 Correct 5 ms 22108 KB Output is correct
17 Correct 5 ms 22108 KB Output is correct
18 Correct 5 ms 22108 KB Output is correct
19 Correct 5 ms 22108 KB Output is correct
20 Correct 6 ms 22180 KB Output is correct
21 Correct 6 ms 22108 KB Output is correct
22 Correct 6 ms 22204 KB Output is correct
23 Correct 6 ms 22108 KB Output is correct
24 Correct 5 ms 22216 KB Output is correct
25 Correct 6 ms 22108 KB Output is correct
26 Correct 5 ms 22108 KB Output is correct
27 Correct 6 ms 22108 KB Output is correct
28 Correct 7 ms 22360 KB Output is correct
29 Correct 6 ms 22108 KB Output is correct
30 Correct 5 ms 22196 KB Output is correct
31 Correct 5 ms 22220 KB Output is correct
32 Correct 5 ms 22196 KB Output is correct
33 Correct 6 ms 22108 KB Output is correct
34 Correct 8 ms 22512 KB Output is correct
35 Correct 66 ms 29780 KB Output is correct
36 Correct 90 ms 34884 KB Output is correct
37 Correct 87 ms 34920 KB Output is correct
38 Correct 84 ms 34508 KB Output is correct
39 Correct 8 ms 22816 KB Output is correct
40 Correct 11 ms 23388 KB Output is correct
41 Correct 10 ms 23244 KB Output is correct
42 Correct 8 ms 22620 KB Output is correct
43 Correct 8 ms 22732 KB Output is correct
44 Correct 9 ms 22620 KB Output is correct
45 Correct 8 ms 22620 KB Output is correct
46 Correct 8 ms 22620 KB Output is correct
47 Correct 10 ms 23132 KB Output is correct
48 Correct 10 ms 23132 KB Output is correct
49 Correct 18 ms 25120 KB Output is correct
50 Correct 90 ms 35152 KB Output is correct
51 Correct 12 ms 23128 KB Output is correct
52 Correct 74 ms 32736 KB Output is correct
53 Correct 17 ms 24668 KB Output is correct
54 Correct 81 ms 33780 KB Output is correct
55 Correct 11 ms 23128 KB Output is correct
56 Correct 11 ms 23132 KB Output is correct
57 Correct 13 ms 26352 KB Output is correct
58 Correct 13 ms 26204 KB Output is correct
59 Correct 10 ms 23388 KB Output is correct
60 Correct 58 ms 28384 KB Output is correct
61 Correct 10 ms 23128 KB Output is correct
62 Correct 84 ms 34244 KB Output is correct
63 Correct 484 ms 88876 KB Output is correct
64 Correct 499 ms 88868 KB Output is correct
65 Correct 526 ms 88872 KB Output is correct
66 Correct 255 ms 50048 KB Output is correct
67 Correct 534 ms 103344 KB Output is correct
68 Correct 244 ms 50260 KB Output is correct
69 Correct 341 ms 47924 KB Output is correct
70 Correct 275 ms 50260 KB Output is correct
71 Correct 266 ms 50260 KB Output is correct
72 Correct 511 ms 72148 KB Output is correct
73 Correct 498 ms 75564 KB Output is correct
74 Correct 1283 ms 126816 KB Output is correct
75 Correct 531 ms 57292 KB Output is correct
76 Correct 832 ms 86116 KB Output is correct
77 Correct 836 ms 86592 KB Output is correct
78 Correct 222 ms 51540 KB Output is correct
79 Correct 376 ms 59088 KB Output is correct
80 Correct 212 ms 50256 KB Output is correct
81 Correct 346 ms 54340 KB Output is correct
82 Correct 773 ms 75092 KB Output is correct
83 Correct 748 ms 75192 KB Output is correct
84 Correct 874 ms 229460 KB Output is correct
85 Correct 862 ms 229460 KB Output is correct
86 Correct 432 ms 114040 KB Output is correct
87 Correct 453 ms 116560 KB Output is correct
88 Correct 516 ms 74320 KB Output is correct
89 Correct 824 ms 80088 KB Output is correct