oj.uz

Submission #1000270

# Submission time Handle Problem Language Result Execution time Memory
1000270 2024-06-17T07:43:22 Z snpmrnhlol Making Friends on Joitter is Fun (JOI20_joitter2) C++17
100 / 100
 510 ms 143820 KB 
#include<bits/stdc++.h>
//#define cin fin
//#define cout fout
using namespace std;
//ifstream fin("a.in");
//ofstream fout("a.out");
const int N = 2e5;
typedef long long ll;
ll ans = 0;
int n,m;
struct DSU{
    int p,sz;
    set <int> boys;
    vector <int> comp;
}dsu[N];
set <int> edges[N];
multiset <int> compedges[N];
int leader(int x){
    if(x == dsu[x].p)return x;
    return dsu[x].p = leader(dsu[x].p);
}
bool checkedge(int x,int y){
    int compx = leader(x);
    int compy = leader(y);
    if(compx == compy)return 1;
    if(dsu[compy].boys.find(x) != dsu[compy].boys.end())return 1;
    return 0;
}
bool check(int x,int y){
    if(x == y)return 1;
    if(compedges[x].find(y) != compedges[x].end())return 1;
    return 0;
}
void connect(int x,int y){
    x = leader(x);
    y = leader(y);
    if(x == y)return;
    if(dsu[x].sz + dsu[x].boys.size() + compedges[x].size() > dsu[y].sz + dsu[y].boys.size() + compedges[y].size())swap(x,y);
    ///check new edges
    queue <int> q;
    int nr1 = -1;
    for(auto i:dsu[x].boys){
        if(leader(i) == x || leader(i) == y)continue;
        if(check(leader(i),y) && check(x,leader(i))){
            q.push(leader(i));
        }
        if(check(leader(i),x) && check(x,leader(i))){
            q.push(leader(i));
        }
        if(check(leader(i),y) && check(y,leader(i))){
            q.push(leader(i));
        }
        if(check(leader(i),x) && check(y,leader(i))){
            q.push(leader(i));
        }
    }
    for(auto i:compedges[x]){
        if(leader(i) == x || leader(i) == y)continue;
        if(check(leader(i),y) && check(x,leader(i))){
            q.push(leader(i));
        }
        if(check(leader(i),x) && check(x,leader(i))){
            q.push(leader(i));
        }
        if(check(leader(i),y) && check(y,leader(i))){
            q.push(leader(i));
        }
        if(check(leader(i),x) && check(y,leader(i))){
            q.push(leader(i));
        }
    }
    ///y connected to x
    auto it = dsu[x].boys.begin();
    while(it != dsu[x].boys.end()){
        if(leader(*it) == y){
            ans-=dsu[x].sz;
            it = dsu[x].boys.erase(it);
            edges[*it].erase(x);
            compedges[y].erase(compedges[y].find(x));
        }else{
            it++;
        }
    }
    ///x connected to y
    for(auto i:dsu[x].comp){
        auto it = dsu[y].boys.find(i);
        if(it != dsu[y].boys.end()){
            ans-=dsu[y].sz;
            dsu[y].boys.erase(it);
            edges[*it].erase(y);
            compedges[x].erase(compedges[x].find(y));
        }
        dsu[y].comp.push_back(i);
    }
    ans+=1ll*dsu[x].boys.size()*dsu[y].sz;
    ans+=1ll*dsu[y].boys.size()*dsu[x].sz;
    ///x and y connected to random node
    for(auto i:dsu[x].boys){
        assert(leader(i) != y);
        if(dsu[y].boys.find(i) != dsu[y].boys.end()){
            ans-=dsu[x].sz;
            ans-=dsu[y].sz;
        }
        dsu[y].boys.insert(i);
        edges[i].erase(x);
        compedges[leader(i)].erase(compedges[leader(i)].find(leader(x)));
        edges[i].insert(y);
        compedges[leader(i)].insert(leader(y));
    }
    for(auto i:compedges[x]){
        compedges[y].insert(i);
    }
    ans+=2ll*dsu[x].sz*dsu[y].sz;
    dsu[x].p = y;
    dsu[y].sz+=dsu[x].sz;
    dsu[x].comp.clear();
    dsu[x].boys.clear();
    compedges[x].clear();
    while(!q.empty()){
        int x = q.front();
        q.pop();
        connect(y,x);

    }
}
void addedge(int x,int y){
    int compx = leader(x);
    int compy = leader(y);
    if(checkedge(x,y))return;
    if(check(compy,compx)){
        connect(x,y);
    }else{
        dsu[compy].boys.insert(x);
        edges[x].insert(compy);
        compedges[compx].insert(compy);
        ans+=dsu[compy].sz;
    }
}
void dbg(){
    for(int i = 0;i < n;i++){
        cout<<"dsuinvestigate:"<<i<<'\n';
        cout<<dsu[i].p<<' '<<dsu[i].sz<<'\n';
        for(auto j:dsu[i].boys)cout<<j<<' ';cout<<'\n';
        for(auto j:dsu[i].comp)cout<<j<<' ';cout<<'\n';
    }
}
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin>>n>>m;
    for(int i = 0;i < n;i++){
        dsu[i] = {i,1};
        dsu[i].comp.push_back(i);
    }
    for(int i = 0;i < m;i++){
        int u,w;
        cin>>u>>w;
        u--;w--;
        addedge(u,w);
        //dbg();
        cout<<ans<<'\n';
    }
    return 0;
}
/**
5 20
4 2
1 5
2 3
2 5
3 2
3 1
4 5
1 2
5 2
1 4
4 1
3 4
5 1
2 4
2 1
4 3
1 3
5 4
3 5
5 3

**/

Compilation message

joitter2.cpp: In function 'void connect(int, int)':
joitter2.cpp:41:9: warning: unused variable 'nr1' [-Wunused-variable]
   41 |     int nr1 = -1;
      |         ^~~
joitter2.cpp: In function 'void dbg()':
joitter2.cpp:143:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  143 |         for(auto j:dsu[i].boys)cout<<j<<' ';cout<<'\n';
      |         ^~~
joitter2.cpp:143:45: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  143 |         for(auto j:dsu[i].boys)cout<<j<<' ';cout<<'\n';
      |                                             ^~~~
joitter2.cpp:144:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  144 |         for(auto j:dsu[i].comp)cout<<j<<' ';cout<<'\n';
      |         ^~~
joitter2.cpp:144:45: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  144 |         for(auto j:dsu[i].comp)cout<<j<<' ';cout<<'\n';
      |                                             ^~~~

Subtask #1
1.0 / 1.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 34648 KB Output is correct
2 Correct 6 ms 34652 KB Output is correct
3 Correct 5 ms 34652 KB Output is correct
4 Correct 6 ms 34652 KB Output is correct
5 Correct 6 ms 34652 KB Output is correct
6 Correct 5 ms 34908 KB Output is correct
7 Correct 6 ms 34908 KB Output is correct
8 Correct 6 ms 34928 KB Output is correct
9 Correct 7 ms 35160 KB Output is correct
10 Correct 6 ms 34652 KB Output is correct
11 Correct 6 ms 34680 KB Output is correct
12 Correct 5 ms 34652 KB Output is correct
13 Correct 6 ms 34652 KB Output is correct
14 Correct 6 ms 34652 KB Output is correct
15 Correct 5 ms 34908 KB Output is correct
16 Correct 5 ms 34676 KB Output is correct
17 Correct 5 ms 34652 KB Output is correct
18 Correct 6 ms 34648 KB Output is correct
19 Correct 5 ms 34652 KB Output is correct
20 Correct 7 ms 34908 KB Output is correct
21 Correct 5 ms 34856 KB Output is correct
22 Correct 5 ms 34668 KB Output is correct
23 Correct 6 ms 34908 KB Output is correct
24 Correct 8 ms 34740 KB Output is correct
25 Correct 6 ms 34908 KB Output is correct
26 Correct 6 ms 34904 KB Output is correct
27 Correct 6 ms 34908 KB Output is correct
28 Correct 6 ms 34908 KB Output is correct
29 Correct 6 ms 34808 KB Output is correct
30 Correct 6 ms 34652 KB Output is correct
31 Correct 6 ms 34680 KB Output is correct
32 Correct 5 ms 34908 KB Output is correct
33 Correct 6 ms 34908 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 34648 KB Output is correct
2 Correct 6 ms 34652 KB Output is correct
3 Correct 5 ms 34652 KB Output is correct
4 Correct 6 ms 34652 KB Output is correct
5 Correct 6 ms 34652 KB Output is correct
6 Correct 5 ms 34908 KB Output is correct
7 Correct 6 ms 34908 KB Output is correct
8 Correct 6 ms 34928 KB Output is correct
9 Correct 7 ms 35160 KB Output is correct
10 Correct 6 ms 34652 KB Output is correct
11 Correct 6 ms 34680 KB Output is correct
12 Correct 5 ms 34652 KB Output is correct
13 Correct 6 ms 34652 KB Output is correct
14 Correct 6 ms 34652 KB Output is correct
15 Correct 5 ms 34908 KB Output is correct
16 Correct 5 ms 34676 KB Output is correct
17 Correct 5 ms 34652 KB Output is correct
18 Correct 6 ms 34648 KB Output is correct
19 Correct 5 ms 34652 KB Output is correct
20 Correct 7 ms 34908 KB Output is correct
21 Correct 5 ms 34856 KB Output is correct
22 Correct 5 ms 34668 KB Output is correct
23 Correct 6 ms 34908 KB Output is correct
24 Correct 8 ms 34740 KB Output is correct
25 Correct 6 ms 34908 KB Output is correct
26 Correct 6 ms 34904 KB Output is correct
27 Correct 6 ms 34908 KB Output is correct
28 Correct 6 ms 34908 KB Output is correct
29 Correct 6 ms 34808 KB Output is correct
30 Correct 6 ms 34652 KB Output is correct
31 Correct 6 ms 34680 KB Output is correct
32 Correct 5 ms 34908 KB Output is correct
33 Correct 6 ms 34908 KB Output is correct
34 Correct 7 ms 34908 KB Output is correct
35 Correct 58 ms 38764 KB Output is correct
36 Correct 89 ms 41412 KB Output is correct
37 Correct 94 ms 41456 KB Output is correct
38 Correct 77 ms 41144 KB Output is correct
39 Correct 7 ms 34904 KB Output is correct
40 Correct 8 ms 35164 KB Output is correct
41 Correct 8 ms 35128 KB Output is correct
42 Correct 7 ms 34908 KB Output is correct
43 Correct 8 ms 35160 KB Output is correct
44 Correct 8 ms 34908 KB Output is correct
45 Correct 7 ms 34908 KB Output is correct
46 Correct 7 ms 34908 KB Output is correct
47 Correct 8 ms 35164 KB Output is correct
48 Correct 8 ms 35132 KB Output is correct
49 Correct 16 ms 36188 KB Output is correct
50 Correct 100 ms 41656 KB Output is correct
51 Correct 10 ms 35160 KB Output is correct
52 Correct 66 ms 40124 KB Output is correct
53 Correct 14 ms 35932 KB Output is correct
54 Correct 74 ms 40972 KB Output is correct
55 Correct 10 ms 35420 KB Output is correct
56 Correct 9 ms 35420 KB Output is correct
57 Correct 10 ms 36952 KB Output is correct
58 Correct 11 ms 36948 KB Output is correct
59 Correct 7 ms 34908 KB Output is correct
60 Correct 51 ms 37508 KB Output is correct
61 Correct 8 ms 35160 KB Output is correct
62 Correct 87 ms 41096 KB Output is correct

Subtask #3
83.0 / 83.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 34648 KB Output is correct
2 Correct 6 ms 34652 KB Output is correct
3 Correct 5 ms 34652 KB Output is correct
4 Correct 6 ms 34652 KB Output is correct
5 Correct 6 ms 34652 KB Output is correct
6 Correct 5 ms 34908 KB Output is correct
7 Correct 6 ms 34908 KB Output is correct
8 Correct 6 ms 34928 KB Output is correct
9 Correct 7 ms 35160 KB Output is correct
10 Correct 6 ms 34652 KB Output is correct
11 Correct 6 ms 34680 KB Output is correct
12 Correct 5 ms 34652 KB Output is correct
13 Correct 6 ms 34652 KB Output is correct
14 Correct 6 ms 34652 KB Output is correct
15 Correct 5 ms 34908 KB Output is correct
16 Correct 5 ms 34676 KB Output is correct
17 Correct 5 ms 34652 KB Output is correct
18 Correct 6 ms 34648 KB Output is correct
19 Correct 5 ms 34652 KB Output is correct
20 Correct 7 ms 34908 KB Output is correct
21 Correct 5 ms 34856 KB Output is correct
22 Correct 5 ms 34668 KB Output is correct
23 Correct 6 ms 34908 KB Output is correct
24 Correct 8 ms 34740 KB Output is correct
25 Correct 6 ms 34908 KB Output is correct
26 Correct 6 ms 34904 KB Output is correct
27 Correct 6 ms 34908 KB Output is correct
28 Correct 6 ms 34908 KB Output is correct
29 Correct 6 ms 34808 KB Output is correct
30 Correct 6 ms 34652 KB Output is correct
31 Correct 6 ms 34680 KB Output is correct
32 Correct 5 ms 34908 KB Output is correct
33 Correct 6 ms 34908 KB Output is correct
34 Correct 7 ms 34908 KB Output is correct
35 Correct 58 ms 38764 KB Output is correct
36 Correct 89 ms 41412 KB Output is correct
37 Correct 94 ms 41456 KB Output is correct
38 Correct 77 ms 41144 KB Output is correct
39 Correct 7 ms 34904 KB Output is correct
40 Correct 8 ms 35164 KB Output is correct
41 Correct 8 ms 35128 KB Output is correct
42 Correct 7 ms 34908 KB Output is correct
43 Correct 8 ms 35160 KB Output is correct
44 Correct 8 ms 34908 KB Output is correct
45 Correct 7 ms 34908 KB Output is correct
46 Correct 7 ms 34908 KB Output is correct
47 Correct 8 ms 35164 KB Output is correct
48 Correct 8 ms 35132 KB Output is correct
49 Correct 16 ms 36188 KB Output is correct
50 Correct 100 ms 41656 KB Output is correct
51 Correct 10 ms 35160 KB Output is correct
52 Correct 66 ms 40124 KB Output is correct
53 Correct 14 ms 35932 KB Output is correct
54 Correct 74 ms 40972 KB Output is correct
55 Correct 10 ms 35420 KB Output is correct
56 Correct 9 ms 35420 KB Output is correct
57 Correct 10 ms 36952 KB Output is correct
58 Correct 11 ms 36948 KB Output is correct
59 Correct 7 ms 34908 KB Output is correct
60 Correct 51 ms 37508 KB Output is correct
61 Correct 8 ms 35160 KB Output is correct
62 Correct 87 ms 41096 KB Output is correct
63 Correct 299 ms 82252 KB Output is correct
64 Correct 313 ms 82256 KB Output is correct
65 Correct 289 ms 82260 KB Output is correct
66 Correct 76 ms 45000 KB Output is correct
67 Correct 121 ms 49996 KB Output is correct
68 Correct 117 ms 44992 KB Output is correct
69 Correct 174 ms 49880 KB Output is correct
70 Correct 88 ms 47300 KB Output is correct
71 Correct 79 ms 47300 KB Output is correct
72 Correct 149 ms 50636 KB Output is correct
73 Correct 179 ms 50740 KB Output is correct
74 Correct 510 ms 68304 KB Output is correct
75 Correct 281 ms 56612 KB Output is correct
76 Correct 353 ms 62152 KB Output is correct
77 Correct 381 ms 63932 KB Output is correct
78 Correct 102 ms 49808 KB Output is correct
79 Correct 181 ms 54216 KB Output is correct
80 Correct 101 ms 49464 KB Output is correct
81 Correct 154 ms 52936 KB Output is correct
82 Correct 393 ms 70352 KB Output is correct
83 Correct 359 ms 70220 KB Output is correct
84 Correct 413 ms 143676 KB Output is correct
85 Correct 430 ms 143820 KB Output is correct
86 Correct 87 ms 51352 KB Output is correct
87 Correct 117 ms 53516 KB Output is correct
88 Correct 172 ms 50768 KB Output is correct
89 Correct 335 ms 60912 KB Output is correct