oj.uz

Submission #978852

# Submission time Handle Problem Language Result Execution time Memory
978852 2024-05-09T19:41:41 Z Mr_Husanboy Making Friends on Joitter is Fun (JOI20_joitter2) C++17
100 / 100
 1268 ms 67744 KB 
//#pragma GCC optimize("Ofast,O3")
//#pragma GCC target("avx,avx2")
#include <bits/stdc++.h>
using namespace std;



#ifdef LOCAL
#include "debugger.cpp"
#else
#define debug(...)
#endif
template<class T>
int len(T &a){
    return a.size();
}

using ll = long long;
using pii = pair<int,int>;
#define all(a) (a).begin(), (a).end()
#define ff first
#define ss second
string fileio = "";

mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
const int MOD = 1e9 + 7;
const int inf = 1e9;
const ll infl = 1e18;
const int maxn = 1e5 + 1;

struct DSU{
    vector<int> par, sz; int n;
    DSU (int _n){
        n = _n;
        par.resize(n);
        iota(all(par), 0);
        sz.assign(n, 1);
    }
    DSU (){}
    int get(int a){
        return (par[a] == a ? a : par[a] = get(par[a]));
    }

    void init(int _n){
        n = _n;
        par.resize(n);
        iota(all(par), 0);
        sz.assign(n, 1);
    }

    void unite(int a, int b){
        a = get(a);
        b = get(b);
        if(a == b) return;
        if(sz[a] < sz[b]) swap(a,b);
        sz[a] += sz[b];
        par[b] = a;
    }

    void link(int a, int b){
        a = get(a); b = get(b);
        if(a == b) return;
        sz[b] += sz[a];
        par[a] = b;
    }
};


void solve(){
    int n, m; cin >> n >> m;
    vector<set<int>> half(n), rhalf(n);
    vector<set<int>> lead(n);
    for(int i = 0; i < n; i ++) lead[i].insert(i);
    DSU t(n);
    ll ans = 0;

    queue<pair<int,int>> q;

    auto half_edge = [&](int a, int b){
        //debug(a + 1, b + 1);
        half[a].insert(b);
        rhalf[b].insert(a);
        if(half[b].count(a)){
            q.push({a, b});
        }
    };

    while(m --){
        int a, b; cin >> a >> b; a --; b --;

        int la = t.get(a), lb = t.get(b);
        if(la == lb || lead[lb].count(a)){
            cout << ans << '\n';
            continue;
        }   

        lead[lb].insert(a);
        half_edge(la, lb);

        ans += t.sz[lb];

        while(!q.empty()){
            tie(a, b) = q.front(); q.pop();
            a = t.get(a), b = t.get(b);
            if(a == b) continue;

            ans += 1ll * t.sz[a] * len(lead[b]) + 1ll * t.sz[b] * len(lead[a]);

            if(len(lead[a]) > len(lead[b])) swap(a, b);
            t.link(a, b);


            for(auto u : lead[a]){
                if(lead[b].count(u)) ans -= t.sz[b];
                else lead[b].insert(u);
            }
            lead[a].clear();

            half[a].erase(b); half[b].erase(a);
            rhalf[b].erase(a); rhalf[a].erase(b);

            for(auto i : half[a]){
                rhalf[i].erase(b);
                half_edge(b, i);
            }

            for(auto i : rhalf[a]){
                half[i].erase(a);
                half_edge(i, b);
            }
        }
        cout << ans << '\n';
    }
}

int main(){
    ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
    auto start = chrono::high_resolution_clock::now();
    #ifndef LOCAL
    if(fileio.size()){
        freopen((fileio + ".in").c_str(), "r", stdin);
        freopen((fileio + ".out").c_str(), "w", stdout);
    }
    #endif
    int testcases = 1;
    #ifdef Tests
    cin >> testcases;
    #endif
    while(testcases --){
        solve();
        if(testcases) cout << '\n';
        #ifdef LOCAL
        else cout << '\n';
        cout << "_________________________" << endl;
        #endif
    }
    #ifdef LOCAL
    auto duration = chrono::duration_cast<chrono::microseconds>(chrono::high_resolution_clock::now() - start);
    
    cout << "time: " << (double)duration.count()/1000.0 << " milliseconds" << endl;
    #endif
    return 0;
}

Compilation message

joitter2.cpp: In function 'int main()':
joitter2.cpp:138:10: warning: variable 'start' set but not used [-Wunused-but-set-variable]
  138 |     auto start = chrono::high_resolution_clock::now();
      |          ^~~~~
joitter2.cpp:141:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  141 |         freopen((fileio + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
joitter2.cpp:142:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  142 |         freopen((fileio + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
1.0 / 1.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 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 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 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 456 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 1 ms 424 KB Output is correct
22 Correct 0 ms 344 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 344 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 1 ms 344 KB Output is correct
28 Correct 0 ms 600 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 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 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 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 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 456 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 1 ms 424 KB Output is correct
22 Correct 0 ms 344 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 344 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 1 ms 344 KB Output is correct
28 Correct 0 ms 600 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 53 ms 6272 KB Output is correct
36 Correct 80 ms 9780 KB Output is correct
37 Correct 76 ms 9300 KB Output is correct
38 Correct 80 ms 8952 KB Output is correct
39 Correct 2 ms 856 KB Output is correct
40 Correct 4 ms 1116 KB Output is correct
41 Correct 4 ms 1116 KB Output is correct
42 Correct 2 ms 860 KB Output is correct
43 Correct 3 ms 860 KB Output is correct
44 Correct 3 ms 860 KB Output is correct
45 Correct 3 ms 856 KB Output is correct
46 Correct 2 ms 1112 KB Output is correct
47 Correct 4 ms 860 KB Output is correct
48 Correct 4 ms 860 KB Output is correct
49 Correct 10 ms 1876 KB Output is correct
50 Correct 78 ms 9380 KB Output is correct
51 Correct 6 ms 1368 KB Output is correct
52 Correct 79 ms 7684 KB Output is correct
53 Correct 9 ms 1880 KB Output is correct
54 Correct 70 ms 8532 KB Output is correct
55 Correct 5 ms 1372 KB Output is correct
56 Correct 5 ms 1372 KB Output is correct
57 Correct 5 ms 1372 KB Output is correct
58 Correct 6 ms 1372 KB Output is correct
59 Correct 3 ms 860 KB Output is correct
60 Correct 50 ms 5892 KB Output is correct
61 Correct 4 ms 1112 KB Output is correct
62 Correct 73 ms 8788 KB Output is correct

Subtask #3
83.0 / 83.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 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 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 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 456 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 1 ms 424 KB Output is correct
22 Correct 0 ms 344 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 344 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 1 ms 344 KB Output is correct
28 Correct 0 ms 600 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 53 ms 6272 KB Output is correct
36 Correct 80 ms 9780 KB Output is correct
37 Correct 76 ms 9300 KB Output is correct
38 Correct 80 ms 8952 KB Output is correct
39 Correct 2 ms 856 KB Output is correct
40 Correct 4 ms 1116 KB Output is correct
41 Correct 4 ms 1116 KB Output is correct
42 Correct 2 ms 860 KB Output is correct
43 Correct 3 ms 860 KB Output is correct
44 Correct 3 ms 860 KB Output is correct
45 Correct 3 ms 856 KB Output is correct
46 Correct 2 ms 1112 KB Output is correct
47 Correct 4 ms 860 KB Output is correct
48 Correct 4 ms 860 KB Output is correct
49 Correct 10 ms 1876 KB Output is correct
50 Correct 78 ms 9380 KB Output is correct
51 Correct 6 ms 1368 KB Output is correct
52 Correct 79 ms 7684 KB Output is correct
53 Correct 9 ms 1880 KB Output is correct
54 Correct 70 ms 8532 KB Output is correct
55 Correct 5 ms 1372 KB Output is correct
56 Correct 5 ms 1372 KB Output is correct
57 Correct 5 ms 1372 KB Output is correct
58 Correct 6 ms 1372 KB Output is correct
59 Correct 3 ms 860 KB Output is correct
60 Correct 50 ms 5892 KB Output is correct
61 Correct 4 ms 1112 KB Output is correct
62 Correct 73 ms 8788 KB Output is correct
63 Correct 507 ms 67616 KB Output is correct
64 Correct 479 ms 67668 KB Output is correct
65 Correct 511 ms 67744 KB Output is correct
66 Correct 183 ms 24320 KB Output is correct
67 Correct 512 ms 41340 KB Output is correct
68 Correct 153 ms 24400 KB Output is correct
69 Correct 290 ms 31268 KB Output is correct
70 Correct 165 ms 24400 KB Output is correct
71 Correct 164 ms 24400 KB Output is correct
72 Correct 449 ms 32608 KB Output is correct
73 Correct 405 ms 32376 KB Output is correct
74 Correct 1268 ms 62988 KB Output is correct
75 Correct 552 ms 38488 KB Output is correct
76 Correct 840 ms 48976 KB Output is correct
77 Correct 824 ms 49504 KB Output is correct
78 Correct 232 ms 35976 KB Output is correct
79 Correct 409 ms 39276 KB Output is correct
80 Correct 191 ms 33756 KB Output is correct
81 Correct 336 ms 36840 KB Output is correct
82 Correct 886 ms 53256 KB Output is correct
83 Correct 854 ms 53012 KB Output is correct
84 Correct 639 ms 52308 KB Output is correct
85 Correct 662 ms 52052 KB Output is correct
86 Correct 270 ms 25192 KB Output is correct
87 Correct 267 ms 27348 KB Output is correct
88 Correct 448 ms 32756 KB Output is correct
89 Correct 851 ms 47076 KB Output is correct