oj.uz

Submission #938507

# Submission time Handle Problem Language Result Execution time Memory
938507 2024-03-05T08:29:23 Z guagua0407 Making Friends on Joitter is Fun (JOI20_joitter2) C++17
17 / 100
 5000 ms 87520 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]--;
                R2[b][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 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 344 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 1 ms 344 KB Output is correct
9 Correct 1 ms 512 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 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 0 ms 348 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 404 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 0 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 0 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 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 344 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 1 ms 344 KB Output is correct
9 Correct 1 ms 512 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 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 0 ms 348 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 404 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 0 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 0 ms 348 KB Output is correct
33 Correct 1 ms 348 KB Output is correct
34 Correct 2 ms 604 KB Output is correct
35 Correct 63 ms 4600 KB Output is correct
36 Correct 105 ms 7820 KB Output is correct
37 Correct 103 ms 8160 KB Output is correct
38 Correct 108 ms 7504 KB Output is correct
39 Correct 3 ms 1116 KB Output is correct
40 Correct 5 ms 1536 KB Output is correct
41 Correct 5 ms 1372 KB Output is correct
42 Correct 2 ms 1116 KB Output is correct
43 Correct 8 ms 1116 KB Output is correct
44 Correct 8 ms 1112 KB Output is correct
45 Correct 3 ms 1368 KB Output is correct
46 Correct 2 ms 1100 KB Output is correct
47 Correct 4 ms 1116 KB Output is correct
48 Correct 4 ms 1116 KB Output is correct
49 Correct 15 ms 2156 KB Output is correct
50 Correct 107 ms 8108 KB Output is correct
51 Correct 12 ms 1372 KB Output is correct
52 Correct 84 ms 5988 KB Output is correct
53 Correct 15 ms 2140 KB Output is correct
54 Correct 94 ms 7056 KB Output is correct
55 Correct 13 ms 1624 KB Output is correct
56 Correct 16 ms 1628 KB Output is correct
57 Correct 10 ms 1624 KB Output is correct
58 Correct 10 ms 1628 KB Output is correct
59 Correct 4 ms 1448 KB Output is correct
60 Correct 52 ms 3856 KB Output is correct
61 Correct 6 ms 1368 KB Output is correct
62 Correct 98 ms 7396 KB Output is correct

Subtask #3
0 / 83.0

# 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 344 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 1 ms 344 KB Output is correct
9 Correct 1 ms 512 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 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 0 ms 348 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 404 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 0 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 0 ms 348 KB Output is correct
33 Correct 1 ms 348 KB Output is correct
34 Correct 2 ms 604 KB Output is correct
35 Correct 63 ms 4600 KB Output is correct
36 Correct 105 ms 7820 KB Output is correct
37 Correct 103 ms 8160 KB Output is correct
38 Correct 108 ms 7504 KB Output is correct
39 Correct 3 ms 1116 KB Output is correct
40 Correct 5 ms 1536 KB Output is correct
41 Correct 5 ms 1372 KB Output is correct
42 Correct 2 ms 1116 KB Output is correct
43 Correct 8 ms 1116 KB Output is correct
44 Correct 8 ms 1112 KB Output is correct
45 Correct 3 ms 1368 KB Output is correct
46 Correct 2 ms 1100 KB Output is correct
47 Correct 4 ms 1116 KB Output is correct
48 Correct 4 ms 1116 KB Output is correct
49 Correct 15 ms 2156 KB Output is correct
50 Correct 107 ms 8108 KB Output is correct
51 Correct 12 ms 1372 KB Output is correct
52 Correct 84 ms 5988 KB Output is correct
53 Correct 15 ms 2140 KB Output is correct
54 Correct 94 ms 7056 KB Output is correct
55 Correct 13 ms 1624 KB Output is correct
56 Correct 16 ms 1628 KB Output is correct
57 Correct 10 ms 1624 KB Output is correct
58 Correct 10 ms 1628 KB Output is correct
59 Correct 4 ms 1448 KB Output is correct
60 Correct 52 ms 3856 KB Output is correct
61 Correct 6 ms 1368 KB Output is correct
62 Correct 98 ms 7396 KB Output is correct
63 Correct 536 ms 87520 KB Output is correct
64 Correct 516 ms 87376 KB Output is correct
65 Correct 524 ms 87128 KB Output is correct
66 Correct 168 ms 35664 KB Output is correct
67 Correct 448 ms 62852 KB Output is correct
68 Correct 170 ms 35664 KB Output is correct
69 Execution timed out 5031 ms 39100 KB Time limit exceeded
70 Halted 0 ms 0 KB -