답안 #96021 :: oj.uz

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
96021	2019-02-05T09:39:56 Z	popovicirobert	Network (BOI15_net)	C++14	100 / 100	819 ms	73436 KB

#include <bits/stdc++.h>
#define lsb(x) (x & (-x))
#define ll long long
#define ull unsigned long long
#define ld long double
// 217
// 44

using namespace std;

const int MAXN = (int) 5e5;

vector <int> g[MAXN + 1];
int weight[MAXN + 1];

void dfs(int nod, int par) {
    weight[nod] = (g[nod].size() == 1);
    for(auto it : g[nod]) {
        if(it != par) {
            dfs(it, nod);
            weight[nod] += weight[it];
        }
    }
}

int getCentroid(int nod, int par, int cnt) {
    for(auto it : g[nod]) {
        if(it != par && weight[it] > cnt / 2) {
            return getCentroid(it, nod, cnt);
        }
    }
    return nod;
}

vector < vector <int> > leaves;
priority_queue < pair <int, int> > pq;
int id[MAXN + 1];

void dfs1(int nod, int par, int cur) {
    int son = 0;
    for(auto it : g[nod]) {
        if(it != par) {
            dfs1(it, nod, cur);
            son++;
        }
    }
    if(son == 0) {
        leaves[cur].push_back(nod);
        id[nod] = cur;
    }
}

int main() {
    //ifstream cin("A.in");
    //ofstream cout("A.out");
    int i, n;
    ios::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);
    cin >> n;
    for(i = 1; i < n; i++) {
        int x, y;
        cin >> x >> y;
        g[x].push_back(y);
        g[y].push_back(x);
    }
    int root;
    for(i = 1; i <= n; i++) {
        if(g[i].size() > 1) {
            root = i;
            break;
        }
    }
    dfs(root, 0);
    root = getCentroid(root, 0, weight[root]);
    int sz = g[root].size();
    leaves.resize(sz);
    for(i = 0; i < sz; i++) {
        dfs1(g[root][i], root, i);
    }
    for(i = 0; i < sz; i++) {
        pq.push({leaves[i].size(), i});
    }
    vector < pair <int, int> > sol;
    int leaf = 0;
    while(pq.size() > 1) {
        int id1 = pq.top().second;
        pq.pop();
        int id2 = pq.top().second;
        pq.pop();
        sol.push_back({leaves[id1].back(), leaves[id2].back()});
        if(leaf == 0) {
            leaf = leaves[id1].back();
        }
        leaves[id1].pop_back();
        leaves[id2].pop_back();
        if(leaves[id1].size()) {
            pq.push({leaves[id1].size(), id1});
        }
        if(leaves[id2].size()) {
            pq.push({leaves[id2].size(), id2});
        }
    }
    if(pq.size()) {
        sol.push_back({leaf, leaves[pq.top().second].back()});
    }
    cout << sol.size() << "\n";
    for(auto it : sol) {
        cout << it.first << " " << it.second << "\n";
    }
    //cin.close();
    //cout.close();
    return 0;
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:74:10: warning: 'root' may be used uninitialized in this function [-Wmaybe-uninitialized]
     root = getCentroid(root, 0, weight[root]);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

#	결과	실행 시간	메모리	Grader output
1	Correct	10 ms	12152 KB	Output is correct
2	Correct	10 ms	12152 KB	Output is correct
3	Correct	10 ms	12024 KB	Output is correct
4	Correct	10 ms	12024 KB	Output is correct
5	Correct	10 ms	12152 KB	Output is correct
6	Correct	10 ms	12152 KB	Output is correct
7	Correct	10 ms	12152 KB	Output is correct
8	Correct	10 ms	12024 KB	Output is correct
9	Correct	9 ms	12024 KB	Output is correct
10	Correct	10 ms	12152 KB	Output is correct
11	Correct	10 ms	12024 KB	Output is correct
12	Correct	11 ms	12152 KB	Output is correct
13	Correct	10 ms	12024 KB	Output is correct
14	Correct	10 ms	12024 KB	Output is correct
15	Correct	12 ms	12024 KB	Output is correct
16	Correct	15 ms	12152 KB	Output is correct
17	Correct	12 ms	12024 KB	Output is correct
18	Correct	12 ms	12152 KB	Output is correct
19	Correct	12 ms	12128 KB	Output is correct
20	Correct	12 ms	12100 KB	Output is correct

Subtask #2
45.0 / 45.0

#	결과	실행 시간	메모리	Grader output
1	Correct	10 ms	12152 KB	Output is correct
2	Correct	10 ms	12152 KB	Output is correct
3	Correct	10 ms	12024 KB	Output is correct
4	Correct	10 ms	12024 KB	Output is correct
5	Correct	10 ms	12152 KB	Output is correct
6	Correct	10 ms	12152 KB	Output is correct
7	Correct	10 ms	12152 KB	Output is correct
8	Correct	10 ms	12024 KB	Output is correct
9	Correct	9 ms	12024 KB	Output is correct
10	Correct	10 ms	12152 KB	Output is correct
11	Correct	10 ms	12024 KB	Output is correct
12	Correct	11 ms	12152 KB	Output is correct
13	Correct	10 ms	12024 KB	Output is correct
14	Correct	10 ms	12024 KB	Output is correct
15	Correct	12 ms	12024 KB	Output is correct
16	Correct	15 ms	12152 KB	Output is correct
17	Correct	12 ms	12024 KB	Output is correct
18	Correct	12 ms	12152 KB	Output is correct
19	Correct	12 ms	12128 KB	Output is correct
20	Correct	12 ms	12100 KB	Output is correct
21	Correct	12 ms	12024 KB	Output is correct
22	Correct	13 ms	12360 KB	Output is correct
23	Correct	14 ms	12280 KB	Output is correct
24	Correct	11 ms	12280 KB	Output is correct
25	Correct	11 ms	12152 KB	Output is correct
26	Correct	12 ms	12248 KB	Output is correct
27	Correct	13 ms	12152 KB	Output is correct
28	Correct	12 ms	12152 KB	Output is correct
29	Correct	12 ms	12152 KB	Output is correct
30	Correct	11 ms	12152 KB	Output is correct
31	Correct	12 ms	12156 KB	Output is correct
32	Correct	11 ms	12068 KB	Output is correct
33	Correct	12 ms	12124 KB	Output is correct
34	Correct	12 ms	12152 KB	Output is correct
35	Correct	12 ms	12124 KB	Output is correct
36	Correct	12 ms	12152 KB	Output is correct
37	Correct	12 ms	12152 KB	Output is correct
38	Correct	11 ms	12152 KB	Output is correct
39	Correct	12 ms	12152 KB	Output is correct
40	Correct	10 ms	12024 KB	Output is correct
41	Correct	10 ms	12152 KB	Output is correct
42	Correct	12 ms	12152 KB	Output is correct
43	Correct	11 ms	12280 KB	Output is correct
44	Correct	10 ms	12024 KB	Output is correct
45	Correct	10 ms	12152 KB	Output is correct
46	Correct	10 ms	12152 KB	Output is correct
47	Correct	10 ms	12152 KB	Output is correct
48	Correct	10 ms	12152 KB	Output is correct
49	Correct	10 ms	12152 KB	Output is correct
50	Correct	10 ms	12152 KB	Output is correct
51	Correct	10 ms	12152 KB	Output is correct
52	Correct	11 ms	12152 KB	Output is correct
53	Correct	11 ms	12152 KB	Output is correct
54	Correct	12 ms	12152 KB	Output is correct
55	Correct	12 ms	12152 KB	Output is correct
56	Correct	11 ms	12072 KB	Output is correct
57	Correct	12 ms	12152 KB	Output is correct
58	Correct	10 ms	12156 KB	Output is correct

Subtask #3
37.0 / 37.0

#	결과	실행 시간	메모리	Grader output
1	Correct	10 ms	12152 KB	Output is correct
2	Correct	10 ms	12152 KB	Output is correct
3	Correct	10 ms	12024 KB	Output is correct
4	Correct	10 ms	12024 KB	Output is correct
5	Correct	10 ms	12152 KB	Output is correct
6	Correct	10 ms	12152 KB	Output is correct
7	Correct	10 ms	12152 KB	Output is correct
8	Correct	10 ms	12024 KB	Output is correct
9	Correct	9 ms	12024 KB	Output is correct
10	Correct	10 ms	12152 KB	Output is correct
11	Correct	10 ms	12024 KB	Output is correct
12	Correct	11 ms	12152 KB	Output is correct
13	Correct	10 ms	12024 KB	Output is correct
14	Correct	10 ms	12024 KB	Output is correct
15	Correct	12 ms	12024 KB	Output is correct
16	Correct	15 ms	12152 KB	Output is correct
17	Correct	12 ms	12024 KB	Output is correct
18	Correct	12 ms	12152 KB	Output is correct
19	Correct	12 ms	12128 KB	Output is correct
20	Correct	12 ms	12100 KB	Output is correct
21	Correct	12 ms	12024 KB	Output is correct
22	Correct	13 ms	12360 KB	Output is correct
23	Correct	14 ms	12280 KB	Output is correct
24	Correct	11 ms	12280 KB	Output is correct
25	Correct	11 ms	12152 KB	Output is correct
26	Correct	12 ms	12248 KB	Output is correct
27	Correct	13 ms	12152 KB	Output is correct
28	Correct	12 ms	12152 KB	Output is correct
29	Correct	12 ms	12152 KB	Output is correct
30	Correct	11 ms	12152 KB	Output is correct
31	Correct	12 ms	12156 KB	Output is correct
32	Correct	11 ms	12068 KB	Output is correct
33	Correct	12 ms	12124 KB	Output is correct
34	Correct	12 ms	12152 KB	Output is correct
35	Correct	12 ms	12124 KB	Output is correct
36	Correct	12 ms	12152 KB	Output is correct
37	Correct	12 ms	12152 KB	Output is correct
38	Correct	11 ms	12152 KB	Output is correct
39	Correct	12 ms	12152 KB	Output is correct
40	Correct	10 ms	12024 KB	Output is correct
41	Correct	10 ms	12152 KB	Output is correct
42	Correct	12 ms	12152 KB	Output is correct
43	Correct	11 ms	12280 KB	Output is correct
44	Correct	10 ms	12024 KB	Output is correct
45	Correct	10 ms	12152 KB	Output is correct
46	Correct	10 ms	12152 KB	Output is correct
47	Correct	10 ms	12152 KB	Output is correct
48	Correct	10 ms	12152 KB	Output is correct
49	Correct	10 ms	12152 KB	Output is correct
50	Correct	10 ms	12152 KB	Output is correct
51	Correct	10 ms	12152 KB	Output is correct
52	Correct	11 ms	12152 KB	Output is correct
53	Correct	11 ms	12152 KB	Output is correct
54	Correct	12 ms	12152 KB	Output is correct
55	Correct	12 ms	12152 KB	Output is correct
56	Correct	11 ms	12072 KB	Output is correct
57	Correct	12 ms	12152 KB	Output is correct
58	Correct	10 ms	12156 KB	Output is correct
59	Correct	619 ms	44136 KB	Output is correct
60	Correct	652 ms	39280 KB	Output is correct
61	Correct	13 ms	12152 KB	Output is correct
62	Correct	11 ms	12152 KB	Output is correct
63	Correct	529 ms	38888 KB	Output is correct
64	Correct	14 ms	12664 KB	Output is correct
65	Correct	26 ms	14456 KB	Output is correct
66	Correct	251 ms	30544 KB	Output is correct
67	Correct	745 ms	47744 KB	Output is correct
68	Correct	793 ms	50712 KB	Output is correct
69	Correct	20 ms	13944 KB	Output is correct
70	Correct	159 ms	31300 KB	Output is correct
71	Correct	604 ms	73436 KB	Output is correct
72	Correct	579 ms	69640 KB	Output is correct
73	Correct	140 ms	19508 KB	Output is correct
74	Correct	533 ms	37184 KB	Output is correct
75	Correct	49 ms	17396 KB	Output is correct
76	Correct	566 ms	55892 KB	Output is correct
77	Correct	537 ms	56784 KB	Output is correct
78	Correct	53 ms	16376 KB	Output is correct
79	Correct	819 ms	45428 KB	Output is correct
80	Correct	13 ms	12536 KB	Output is correct
81	Correct	147 ms	27468 KB	Output is correct
82	Correct	660 ms	54372 KB	Output is correct
83	Correct	517 ms	37264 KB	Output is correct
84	Correct	702 ms	37796 KB	Output is correct
85	Correct	667 ms	37676 KB	Output is correct
86	Correct	649 ms	39536 KB	Output is correct
87	Correct	576 ms	39536 KB	Output is correct

답안 #96021

Compilation message

Subtask #1 18.0 / 18.0

Subtask #2 45.0 / 45.0

Subtask #3 37.0 / 37.0

Subtask #1
18.0 / 18.0

Subtask #2
45.0 / 45.0

Subtask #3
37.0 / 37.0