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Submission #211887

# Submission time Handle Problem Language Result Execution time Memory
211887 2020-03-21T15:10:52 Z PeppaPig Making Friends on Joitter is Fun (JOI20_joitter2) C++14
100 / 100
 1094 ms 64248 KB 
#include <bits/stdc++.h>

#define long long long
#define pii pair<int, int>
#define x first
#define y second

using namespace std;

const int N = 1e5+5;

int n, m, par[N], sz[N];
set<int> in[N], out[N], E[N];
long ans;

void update(int x, int sign) { ans += sign * (1ll * (E[x].size() - sz[x]) * sz[x] + 1ll * sz[x] * (sz[x] - 1)); }

int find(int x) { return x == par[x] ? x : find(par[x]); }

queue<pii> Q;

void unite(int a, int b) {
    a = find(a), b = find(b);
    if(a == b) return;
    update(a, -1), update(b, -1);
    if(in[a].size() + out[a].size() + E[a].size() > in[b].size() + out[b].size() + E[b].size())
        swap(a, b);

    in[a].erase(b), out[a].erase(b);
    in[b].erase(a), out[b].erase(a);
    for(int x : in[a]) {
        if(out[b].count(x)) Q.emplace(x, b);
        out[x].erase(a), out[x].emplace(b);
    }
    for(int x : out[a]) {
        if(in[b].count(x)) Q.emplace(x, b);
        in[x].erase(a), in[x].emplace(b);
    }
    for(int x : in[a]) in[b].emplace(x);
    for(int x : out[a]) out[b].emplace(x);
    for(int x : E[a]) E[b].emplace(x);
    in[a].clear(), out[a].clear(), E[a].clear();

    par[a] = b, sz[b] += sz[a];
    update(b, 1);
}

int main() {
    iota(par, par + N, 0), fill_n(sz, N, 1);

    scanf("%d %d", &n, &m);
    for(int i = 1; i <= n; i++) E[i].emplace(i);

    for(int i = 1, a, b; i <= m; i++) {
        scanf("%d %d", &a, &b);
        int pa = find(a), pb = find(b); 
        if(out[pb].count(pa)) {
            Q.emplace(a, b);
            while(!Q.empty()) {
                pii now = Q.front(); Q.pop();
                unite(now.x, now.y);
            }
        } else {
            update(pb, -1);
            E[pb].emplace(a);
            update(pb, 1);
            out[pa].emplace(pb), in[pb].emplace(pa);
        }
        printf("%lld\n", ans);
    }

    return 0;
}

Compilation message

joitter2.cpp: In function 'int main()':
joitter2.cpp:51:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~~
joitter2.cpp:55:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &a, &b);
         ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
1.0 / 1.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 15232 KB Output is correct
2 Correct 14 ms 15232 KB Output is correct
3 Correct 13 ms 15232 KB Output is correct
4 Correct 13 ms 15232 KB Output is correct
5 Correct 13 ms 15232 KB Output is correct
6 Correct 13 ms 15232 KB Output is correct
7 Correct 21 ms 15232 KB Output is correct
8 Correct 15 ms 15232 KB Output is correct
9 Correct 13 ms 15232 KB Output is correct
10 Correct 14 ms 15232 KB Output is correct
11 Correct 13 ms 15232 KB Output is correct
12 Correct 13 ms 15232 KB Output is correct
13 Correct 13 ms 15232 KB Output is correct
14 Correct 13 ms 15232 KB Output is correct
15 Correct 13 ms 15232 KB Output is correct
16 Correct 12 ms 15232 KB Output is correct
17 Correct 13 ms 15232 KB Output is correct
18 Correct 13 ms 15232 KB Output is correct
19 Correct 14 ms 15232 KB Output is correct
20 Correct 13 ms 15232 KB Output is correct
21 Correct 15 ms 15232 KB Output is correct
22 Correct 13 ms 15232 KB Output is correct
23 Correct 14 ms 15232 KB Output is correct
24 Correct 13 ms 15232 KB Output is correct
25 Correct 14 ms 15232 KB Output is correct
26 Correct 13 ms 15232 KB Output is correct
27 Correct 15 ms 15232 KB Output is correct
28 Correct 13 ms 15232 KB Output is correct
29 Correct 13 ms 15232 KB Output is correct
30 Correct 13 ms 15232 KB Output is correct
31 Correct 14 ms 15232 KB Output is correct
32 Correct 13 ms 15232 KB Output is correct
33 Correct 13 ms 15232 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 15232 KB Output is correct
2 Correct 14 ms 15232 KB Output is correct
3 Correct 13 ms 15232 KB Output is correct
4 Correct 13 ms 15232 KB Output is correct
5 Correct 13 ms 15232 KB Output is correct
6 Correct 13 ms 15232 KB Output is correct
7 Correct 21 ms 15232 KB Output is correct
8 Correct 15 ms 15232 KB Output is correct
9 Correct 13 ms 15232 KB Output is correct
10 Correct 14 ms 15232 KB Output is correct
11 Correct 13 ms 15232 KB Output is correct
12 Correct 13 ms 15232 KB Output is correct
13 Correct 13 ms 15232 KB Output is correct
14 Correct 13 ms 15232 KB Output is correct
15 Correct 13 ms 15232 KB Output is correct
16 Correct 12 ms 15232 KB Output is correct
17 Correct 13 ms 15232 KB Output is correct
18 Correct 13 ms 15232 KB Output is correct
19 Correct 14 ms 15232 KB Output is correct
20 Correct 13 ms 15232 KB Output is correct
21 Correct 15 ms 15232 KB Output is correct
22 Correct 13 ms 15232 KB Output is correct
23 Correct 14 ms 15232 KB Output is correct
24 Correct 13 ms 15232 KB Output is correct
25 Correct 14 ms 15232 KB Output is correct
26 Correct 13 ms 15232 KB Output is correct
27 Correct 15 ms 15232 KB Output is correct
28 Correct 13 ms 15232 KB Output is correct
29 Correct 13 ms 15232 KB Output is correct
30 Correct 13 ms 15232 KB Output is correct
31 Correct 14 ms 15232 KB Output is correct
32 Correct 13 ms 15232 KB Output is correct
33 Correct 13 ms 15232 KB Output is correct
34 Correct 17 ms 15360 KB Output is correct
35 Correct 144 ms 18648 KB Output is correct
36 Correct 175 ms 21052 KB Output is correct
37 Correct 168 ms 20984 KB Output is correct
38 Correct 165 ms 20728 KB Output is correct
39 Correct 16 ms 15360 KB Output is correct
40 Correct 17 ms 15488 KB Output is correct
41 Correct 17 ms 15488 KB Output is correct
42 Correct 16 ms 15360 KB Output is correct
43 Correct 17 ms 15488 KB Output is correct
44 Correct 16 ms 15488 KB Output is correct
45 Correct 16 ms 15360 KB Output is correct
46 Correct 15 ms 15360 KB Output is correct
47 Correct 17 ms 15488 KB Output is correct
48 Correct 19 ms 15488 KB Output is correct
49 Correct 26 ms 16124 KB Output is correct
50 Correct 175 ms 21196 KB Output is correct
51 Correct 23 ms 15616 KB Output is correct
52 Correct 150 ms 19576 KB Output is correct
53 Correct 26 ms 16000 KB Output is correct
54 Correct 163 ms 20320 KB Output is correct
55 Correct 19 ms 15872 KB Output is correct
56 Correct 19 ms 15872 KB Output is correct
57 Correct 19 ms 15872 KB Output is correct
58 Correct 20 ms 15872 KB Output is correct
59 Correct 17 ms 15360 KB Output is correct
60 Correct 151 ms 17912 KB Output is correct
61 Correct 18 ms 15520 KB Output is correct
62 Correct 171 ms 20728 KB Output is correct

Subtask #3
83.0 / 83.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 15232 KB Output is correct
2 Correct 14 ms 15232 KB Output is correct
3 Correct 13 ms 15232 KB Output is correct
4 Correct 13 ms 15232 KB Output is correct
5 Correct 13 ms 15232 KB Output is correct
6 Correct 13 ms 15232 KB Output is correct
7 Correct 21 ms 15232 KB Output is correct
8 Correct 15 ms 15232 KB Output is correct
9 Correct 13 ms 15232 KB Output is correct
10 Correct 14 ms 15232 KB Output is correct
11 Correct 13 ms 15232 KB Output is correct
12 Correct 13 ms 15232 KB Output is correct
13 Correct 13 ms 15232 KB Output is correct
14 Correct 13 ms 15232 KB Output is correct
15 Correct 13 ms 15232 KB Output is correct
16 Correct 12 ms 15232 KB Output is correct
17 Correct 13 ms 15232 KB Output is correct
18 Correct 13 ms 15232 KB Output is correct
19 Correct 14 ms 15232 KB Output is correct
20 Correct 13 ms 15232 KB Output is correct
21 Correct 15 ms 15232 KB Output is correct
22 Correct 13 ms 15232 KB Output is correct
23 Correct 14 ms 15232 KB Output is correct
24 Correct 13 ms 15232 KB Output is correct
25 Correct 14 ms 15232 KB Output is correct
26 Correct 13 ms 15232 KB Output is correct
27 Correct 15 ms 15232 KB Output is correct
28 Correct 13 ms 15232 KB Output is correct
29 Correct 13 ms 15232 KB Output is correct
30 Correct 13 ms 15232 KB Output is correct
31 Correct 14 ms 15232 KB Output is correct
32 Correct 13 ms 15232 KB Output is correct
33 Correct 13 ms 15232 KB Output is correct
34 Correct 17 ms 15360 KB Output is correct
35 Correct 144 ms 18648 KB Output is correct
36 Correct 175 ms 21052 KB Output is correct
37 Correct 168 ms 20984 KB Output is correct
38 Correct 165 ms 20728 KB Output is correct
39 Correct 16 ms 15360 KB Output is correct
40 Correct 17 ms 15488 KB Output is correct
41 Correct 17 ms 15488 KB Output is correct
42 Correct 16 ms 15360 KB Output is correct
43 Correct 17 ms 15488 KB Output is correct
44 Correct 16 ms 15488 KB Output is correct
45 Correct 16 ms 15360 KB Output is correct
46 Correct 15 ms 15360 KB Output is correct
47 Correct 17 ms 15488 KB Output is correct
48 Correct 19 ms 15488 KB Output is correct
49 Correct 26 ms 16124 KB Output is correct
50 Correct 175 ms 21196 KB Output is correct
51 Correct 23 ms 15616 KB Output is correct
52 Correct 150 ms 19576 KB Output is correct
53 Correct 26 ms 16000 KB Output is correct
54 Correct 163 ms 20320 KB Output is correct
55 Correct 19 ms 15872 KB Output is correct
56 Correct 19 ms 15872 KB Output is correct
57 Correct 19 ms 15872 KB Output is correct
58 Correct 20 ms 15872 KB Output is correct
59 Correct 17 ms 15360 KB Output is correct
60 Correct 151 ms 17912 KB Output is correct
61 Correct 18 ms 15520 KB Output is correct
62 Correct 171 ms 20728 KB Output is correct
63 Correct 626 ms 64120 KB Output is correct
64 Correct 624 ms 64248 KB Output is correct
65 Correct 624 ms 64248 KB Output is correct
66 Correct 279 ms 22136 KB Output is correct
67 Correct 460 ms 28308 KB Output is correct
68 Correct 241 ms 22136 KB Output is correct
69 Correct 463 ms 28924 KB Output is correct
70 Correct 274 ms 22264 KB Output is correct
71 Correct 278 ms 22008 KB Output is correct
72 Correct 470 ms 28664 KB Output is correct
73 Correct 470 ms 28408 KB Output is correct
74 Correct 1094 ms 38368 KB Output is correct
75 Correct 713 ms 33812 KB Output is correct
76 Correct 878 ms 38140 KB Output is correct
77 Correct 888 ms 38340 KB Output is correct
78 Correct 274 ms 28408 KB Output is correct
79 Correct 499 ms 29944 KB Output is correct
80 Correct 264 ms 28280 KB Output is correct
81 Correct 439 ms 29944 KB Output is correct
82 Correct 1024 ms 49528 KB Output is correct
83 Correct 1045 ms 49564 KB Output is correct
84 Correct 738 ms 49400 KB Output is correct
85 Correct 722 ms 49400 KB Output is correct
86 Correct 354 ms 22776 KB Output is correct
87 Correct 404 ms 24056 KB Output is correct
88 Correct 506 ms 28612 KB Output is correct
89 Correct 815 ms 37884 KB Output is correct