oj.uz

Submission #938675

# Submission time Handle Problem Language Result Execution time Memory
938675 2024-03-05T12:13:55 Z guagua0407 Making Friends on Joitter is Fun (JOI20_joitter2) C++17
17 / 100
 5000 ms 90488 KB 
//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

int dx[4]={0,0,1,-1};
int dy[4]={1,-1,0,0};

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

vector<map<int,int>> S1,S2,R1,R2;
vector<set<int>> belong;
queue<pair<int,int>> q;
ll ans=0;

struct DSU{
    vector<int> e;
    DSU(int n){
        e=vector<int>(n,-1);
        for(int i=0;i<n;i++){
            belong[i].insert(i);
        }
    }
    int find(int x){
        return (e[x]<0?x:e[x]=find(e[x]));
    }
    bool same(int a,int b){
        return find(a)==find(b);
    }
    int sz(int x){
        return -e[find(x)];
    }
    void sir1(int a,int b){
        if(R1[a].size()<sz(b)){
            for(auto it=R1[a].begin();it!=R1[a].end();){
                if(find((*it).f)==b){
                    S1[(*it).f].erase(a);
                    it=R1[a].erase(it);
                }
                else{
                    it++;
                }
            }
        }
        else{
            for(auto v:belong[b]){
                if(R1[a].find(v)!=R1[a].end()){
                    R1[a].erase(v);
                    S1[v].erase(a);
                }
            }
        }
    }
    void sir2(int a,int b){
        if(R2[a].size()<S2[b].size()){
            for(auto v:R2[a]){
                if(S2[b].find(v.f)!=S2[b].end()){
                    q.push({v.f,b});
                }
            }
        }
        else{
            for(auto v:S2[b]){
                if(R2[a].find(v.f)!=R2[a].end()){
                    q.push({v.f,b});
                }
            }
        }
    }
    bool unite(int a,int b){
        a=find(a);
        b=find(b);
        if(a==b) return false;
        ans+=2ll*sz(a)*sz(b)-1ll*S2[a][b]*sz(b)-1ll*S2[b][a]*sz(a);
        //cout<<S2[a][b]<<' '<<sz(b)<<'\n';
        //cout<<S2[b][a]<<' '<<sz(a)<<'\n';
        //cout<<a+1<<' '<<b+1<<' '<<2ll*sz(a)*sz(b)-1ll*S2[a][b]*sz(b)-1ll*S2[b][a]*sz(a)<<'\n';
        // clear (a,b) edges
        S2[a].erase(b);
        S2[b].erase(a);
        R2[a].erase(b);
        R2[b].erase(a);
        sir1(a,b);
        swap(a,b);
        sir1(a,b);
        //new one way edges
        int cnt=0;
        if(R1[a].size()>R1[b].size()) swap(a,b);
        for(auto v:R1[a]){
            if(R1[b].find(v.f)!=R1[b].end()){
                cnt++;
            }
        }
        ans+=1ll*((int)R1[a].size()-cnt)*sz(b)+1ll*((int)R1[b].size()-cnt)*sz(a);
        //out<<a+1<<' '<<b+1<<' '<<1ll*((int)R1[a].size()-cnt)*sz(b)+1ll*((int)R1[b].size()-cnt)*sz(a)<<'\n';
        //new scc edges
        sir2(a,b);
        swap(a,b);
        sir2(a,b);
        // merge
        if(e[a]>e[b]) swap(a,b);
        for(auto v:R1[a]){
            if(R1[b].find(v.f)!=R1[b].end()){
                S2[find(v.f)][b]--;
                if(S2[find(v.f)][b]==0) S2[find(v.f)].erase(b);
                R2[b][find(v.f)]--;
                if(R2[b][find(v.f)]==0) R2[b].erase(find(v.f));
            }
        }
        for(auto v:S2[b]){
            S2[a][v.f]+=v.s;
            R2[v.f].erase(b);
            R2[v.f][a]+=v.s;
        }
        for(auto v:R1[b]){
            S1[v.f].erase(b);
            S1[v.f][a]=1;
            R1[a][v.f]=1;
        }
        for(auto v:R2[b]){
            S2[v.f].erase(b);
            S2[v.f][a]+=v.s;
            R2[a][v.f]+=v.s;

        }
        e[a]+=e[b];
        e[b]=a;
        for(auto v:belong[b]){
            belong[a].insert(v);
        }
        return true;
    }
};

int main() {_
    int n,m;
    cin>>n>>m;
    //assert(n==4 and m==6);
    S1.resize(n);
    S2.resize(n);
    R1.resize(n);
    R2.resize(n);
    belong.resize(n);
    DSU dsu(n);
    for(int i=0;i<m;i++){
        int a,b;
        cin>>a>>b;
        a--;
        b--;
        if(dsu.same(a,b)){
            cout<<ans<<'\n';
            continue;
        }
        int pa=dsu.find(a);
        int pb=dsu.find(b);
        if(S1[a].find(pb)!=S1[a].end()){
            cout<<ans<<'\n';
            continue;
        }
        S1[a][pb]++;
        S2[pa][pb]++;
        R1[pb][a]=1;
        R2[pb][pa]++;
        ans+=dsu.sz(pb);
        //cout<<"-"<<'\n';
        if(S2[pb].find(pa)!=S2[pb].end()){
            //cout<<i+1<<' '<<pa+1<<' '<<pb+1<<'\n';
            q.push({pa,pb});
            while(!q.empty()){
                auto tmp=q.front();
                q.pop();
                dsu.unite(tmp.f,tmp.s);
            }
        }
        cout<<ans<<'\n';
    }
    return 0;
}
//maybe its multiset not set
//yeeorz
//laborz

Compilation message

joitter2.cpp: In member function 'void DSU::sir1(int, int)':
joitter2.cpp:42:24: warning: comparison of integer expressions of different signedness: 'std::map<int, int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   42 |         if(R1[a].size()<sz(b)){
      |            ~~~~~~~~~~~~^~~~~~
joitter2.cpp: In function 'void setIO(std::string)':
joitter2.cpp:15:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
joitter2.cpp:16:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
1.0 / 1.0

# 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 1 ms 604 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 0 ms 456 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 344 KB Output is correct
21 Correct 2 ms 344 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 344 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 0 ms 348 KB Output is correct
30 Correct 0 ms 348 KB Output is correct
31 Correct 1 ms 348 KB Output is correct
32 Correct 1 ms 348 KB Output is correct
33 Correct 1 ms 348 KB Output is correct

Subtask #2
16.0 / 16.0

# 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 1 ms 604 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 0 ms 456 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 344 KB Output is correct
21 Correct 2 ms 344 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 344 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 0 ms 348 KB Output is correct
30 Correct 0 ms 348 KB Output is correct
31 Correct 1 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 2 ms 656 KB Output is correct
35 Correct 70 ms 6896 KB Output is correct
36 Correct 105 ms 10216 KB Output is correct
37 Correct 107 ms 10308 KB Output is correct
38 Correct 106 ms 9780 KB Output is correct
39 Correct 3 ms 1112 KB Output is correct
40 Correct 4 ms 1372 KB Output is correct
41 Correct 4 ms 1552 KB Output is correct
42 Correct 2 ms 1168 KB Output is correct
43 Correct 8 ms 1116 KB Output is correct
44 Correct 8 ms 1292 KB Output is correct
45 Correct 2 ms 1112 KB Output is correct
46 Correct 2 ms 1116 KB Output is correct
47 Correct 4 ms 1372 KB Output is correct
48 Correct 4 ms 1372 KB Output is correct
49 Correct 15 ms 2364 KB Output is correct
50 Correct 119 ms 10668 KB Output is correct
51 Correct 13 ms 1624 KB Output is correct
52 Correct 84 ms 8144 KB Output is correct
53 Correct 15 ms 2140 KB Output is correct
54 Correct 94 ms 9240 KB Output is correct
55 Correct 13 ms 1624 KB Output is correct
56 Correct 13 ms 1628 KB Output is correct
57 Correct 10 ms 1628 KB Output is correct
58 Correct 10 ms 1840 KB Output is correct
59 Correct 4 ms 1372 KB Output is correct
60 Correct 54 ms 6028 KB Output is correct
61 Correct 6 ms 1368 KB Output is correct
62 Correct 104 ms 9712 KB Output is correct

Subtask #3
0 / 83.0

# 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 1 ms 604 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 0 ms 456 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 344 KB Output is correct
21 Correct 2 ms 344 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 344 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 0 ms 348 KB Output is correct
30 Correct 0 ms 348 KB Output is correct
31 Correct 1 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 2 ms 656 KB Output is correct
35 Correct 70 ms 6896 KB Output is correct
36 Correct 105 ms 10216 KB Output is correct
37 Correct 107 ms 10308 KB Output is correct
38 Correct 106 ms 9780 KB Output is correct
39 Correct 3 ms 1112 KB Output is correct
40 Correct 4 ms 1372 KB Output is correct
41 Correct 4 ms 1552 KB Output is correct
42 Correct 2 ms 1168 KB Output is correct
43 Correct 8 ms 1116 KB Output is correct
44 Correct 8 ms 1292 KB Output is correct
45 Correct 2 ms 1112 KB Output is correct
46 Correct 2 ms 1116 KB Output is correct
47 Correct 4 ms 1372 KB Output is correct
48 Correct 4 ms 1372 KB Output is correct
49 Correct 15 ms 2364 KB Output is correct
50 Correct 119 ms 10668 KB Output is correct
51 Correct 13 ms 1624 KB Output is correct
52 Correct 84 ms 8144 KB Output is correct
53 Correct 15 ms 2140 KB Output is correct
54 Correct 94 ms 9240 KB Output is correct
55 Correct 13 ms 1624 KB Output is correct
56 Correct 13 ms 1628 KB Output is correct
57 Correct 10 ms 1628 KB Output is correct
58 Correct 10 ms 1840 KB Output is correct
59 Correct 4 ms 1372 KB Output is correct
60 Correct 54 ms 6028 KB Output is correct
61 Correct 6 ms 1368 KB Output is correct
62 Correct 104 ms 9712 KB Output is correct
63 Correct 523 ms 90196 KB Output is correct
64 Correct 583 ms 90436 KB Output is correct
65 Correct 542 ms 90488 KB Output is correct
66 Correct 168 ms 37716 KB Output is correct
67 Correct 435 ms 65144 KB Output is correct
68 Correct 171 ms 38148 KB Output is correct
69 Execution timed out 5048 ms 40252 KB Time limit exceeded
70 Halted 0 ms 0 KB -