Submission #148102

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
148102	2019-08-31T13:54:57 Z	WhipppedCream	Network (BOI15_net)	C++17	100 / 100	585 ms	57848 KB

#include <bits/stdc++.h>
//#ifdef atom #else #endif
using namespace std;
typedef long long ll; typedef pair<int, int> ii;
#define X first
#define Y second
#define vi vector<int>
#define vii vector< ii >
#define pb push_back
const int maxn = 5e5+5;
vi adj[maxn];
vi leaf;
void dfs(int u, int p)
{
    bool found = 0;
    for(auto v : adj[u])
    {
        if(v == p) continue;
        dfs(v, u);
        found = 1;
    }
    if(!found) leaf.pb(u);
}
int main()
{
    //#ifndef atom freopen(".in", "r", stdin); freopen(".out", "w", stdout); #endif
    int n; scanf("%d", &n);
    for(int i = 0; i< n-1; i++)
    {
        int u, v; scanf("%d %d", &u, &v);
        adj[u].pb(v); adj[v].pb(u);
    }
    int s = 1;
    for(int i = 1; i<= n; i++) if(adj[i].size()> 1) s = i;
    dfs(s, 0);
    printf("%d\n", (leaf.size()+1)/2);
    int mid = (leaf.size()+1)/2;
    for(int i = 0; i< mid; i++)
    {
        printf("%d %d\n", leaf[i], leaf[min((int) leaf.size()-1, mid+i)]);
    }
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:36:37: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=]
     printf("%d\n", (leaf.size()+1)/2);
                    ~~~~~~~~~~~~~~~~~^
net.cpp:27:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     int n; scanf("%d", &n);
            ~~~~~^~~~~~~~~~
net.cpp:30:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         int u, v; scanf("%d %d", &u, &v);
                   ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	13 ms	12152 KB	Output is correct
2	Correct	12 ms	12024 KB	Output is correct
3	Correct	12 ms	12024 KB	Output is correct
4	Correct	13 ms	12080 KB	Output is correct
5	Correct	12 ms	12024 KB	Output is correct
6	Correct	12 ms	12024 KB	Output is correct
7	Correct	13 ms	12024 KB	Output is correct
8	Correct	13 ms	12024 KB	Output is correct
9	Correct	13 ms	12028 KB	Output is correct
10	Correct	12 ms	12024 KB	Output is correct
11	Correct	13 ms	12024 KB	Output is correct
12	Correct	13 ms	12024 KB	Output is correct
13	Correct	13 ms	12024 KB	Output is correct
14	Correct	13 ms	12024 KB	Output is correct
15	Correct	13 ms	12024 KB	Output is correct
16	Correct	13 ms	12024 KB	Output is correct
17	Correct	12 ms	12024 KB	Output is correct
18	Correct	13 ms	12024 KB	Output is correct
19	Correct	13 ms	12024 KB	Output is correct
20	Correct	13 ms	12024 KB	Output is correct

Subtask #2
45.0 / 45.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	13 ms	12152 KB	Output is correct
2	Correct	12 ms	12024 KB	Output is correct
3	Correct	12 ms	12024 KB	Output is correct
4	Correct	13 ms	12080 KB	Output is correct
5	Correct	12 ms	12024 KB	Output is correct
6	Correct	12 ms	12024 KB	Output is correct
7	Correct	13 ms	12024 KB	Output is correct
8	Correct	13 ms	12024 KB	Output is correct
9	Correct	13 ms	12028 KB	Output is correct
10	Correct	12 ms	12024 KB	Output is correct
11	Correct	13 ms	12024 KB	Output is correct
12	Correct	13 ms	12024 KB	Output is correct
13	Correct	13 ms	12024 KB	Output is correct
14	Correct	13 ms	12024 KB	Output is correct
15	Correct	13 ms	12024 KB	Output is correct
16	Correct	13 ms	12024 KB	Output is correct
17	Correct	12 ms	12024 KB	Output is correct
18	Correct	13 ms	12024 KB	Output is correct
19	Correct	13 ms	12024 KB	Output is correct
20	Correct	13 ms	12024 KB	Output is correct
21	Correct	13 ms	12024 KB	Output is correct
22	Correct	17 ms	12152 KB	Output is correct
23	Correct	14 ms	12152 KB	Output is correct
24	Correct	14 ms	12152 KB	Output is correct
25	Correct	14 ms	12252 KB	Output is correct
26	Correct	14 ms	12152 KB	Output is correct
27	Correct	14 ms	12152 KB	Output is correct
28	Correct	14 ms	12152 KB	Output is correct
29	Correct	14 ms	12152 KB	Output is correct
30	Correct	13 ms	12024 KB	Output is correct
31	Correct	14 ms	12152 KB	Output is correct
32	Correct	12 ms	12024 KB	Output is correct
33	Correct	13 ms	12024 KB	Output is correct
34	Correct	13 ms	12024 KB	Output is correct
35	Correct	13 ms	12024 KB	Output is correct
36	Correct	13 ms	12024 KB	Output is correct
37	Correct	13 ms	12024 KB	Output is correct
38	Correct	13 ms	12152 KB	Output is correct
39	Correct	13 ms	12104 KB	Output is correct
40	Correct	12 ms	12024 KB	Output is correct
41	Correct	13 ms	12024 KB	Output is correct
42	Correct	13 ms	12124 KB	Output is correct
43	Correct	13 ms	12152 KB	Output is correct
44	Correct	13 ms	12024 KB	Output is correct
45	Correct	13 ms	12024 KB	Output is correct
46	Correct	14 ms	12024 KB	Output is correct
47	Correct	13 ms	12024 KB	Output is correct
48	Correct	13 ms	12024 KB	Output is correct
49	Correct	14 ms	12152 KB	Output is correct
50	Correct	13 ms	12100 KB	Output is correct
51	Correct	12 ms	12024 KB	Output is correct
52	Correct	13 ms	12024 KB	Output is correct
53	Correct	13 ms	12152 KB	Output is correct
54	Correct	13 ms	12016 KB	Output is correct
55	Correct	13 ms	12064 KB	Output is correct
56	Correct	13 ms	12024 KB	Output is correct
57	Correct	14 ms	12024 KB	Output is correct
58	Correct	14 ms	12152 KB	Output is correct

Subtask #3
37.0 / 37.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	13 ms	12152 KB	Output is correct
2	Correct	12 ms	12024 KB	Output is correct
3	Correct	12 ms	12024 KB	Output is correct
4	Correct	13 ms	12080 KB	Output is correct
5	Correct	12 ms	12024 KB	Output is correct
6	Correct	12 ms	12024 KB	Output is correct
7	Correct	13 ms	12024 KB	Output is correct
8	Correct	13 ms	12024 KB	Output is correct
9	Correct	13 ms	12028 KB	Output is correct
10	Correct	12 ms	12024 KB	Output is correct
11	Correct	13 ms	12024 KB	Output is correct
12	Correct	13 ms	12024 KB	Output is correct
13	Correct	13 ms	12024 KB	Output is correct
14	Correct	13 ms	12024 KB	Output is correct
15	Correct	13 ms	12024 KB	Output is correct
16	Correct	13 ms	12024 KB	Output is correct
17	Correct	12 ms	12024 KB	Output is correct
18	Correct	13 ms	12024 KB	Output is correct
19	Correct	13 ms	12024 KB	Output is correct
20	Correct	13 ms	12024 KB	Output is correct
21	Correct	13 ms	12024 KB	Output is correct
22	Correct	17 ms	12152 KB	Output is correct
23	Correct	14 ms	12152 KB	Output is correct
24	Correct	14 ms	12152 KB	Output is correct
25	Correct	14 ms	12252 KB	Output is correct
26	Correct	14 ms	12152 KB	Output is correct
27	Correct	14 ms	12152 KB	Output is correct
28	Correct	14 ms	12152 KB	Output is correct
29	Correct	14 ms	12152 KB	Output is correct
30	Correct	13 ms	12024 KB	Output is correct
31	Correct	14 ms	12152 KB	Output is correct
32	Correct	12 ms	12024 KB	Output is correct
33	Correct	13 ms	12024 KB	Output is correct
34	Correct	13 ms	12024 KB	Output is correct
35	Correct	13 ms	12024 KB	Output is correct
36	Correct	13 ms	12024 KB	Output is correct
37	Correct	13 ms	12024 KB	Output is correct
38	Correct	13 ms	12152 KB	Output is correct
39	Correct	13 ms	12104 KB	Output is correct
40	Correct	12 ms	12024 KB	Output is correct
41	Correct	13 ms	12024 KB	Output is correct
42	Correct	13 ms	12124 KB	Output is correct
43	Correct	13 ms	12152 KB	Output is correct
44	Correct	13 ms	12024 KB	Output is correct
45	Correct	13 ms	12024 KB	Output is correct
46	Correct	14 ms	12024 KB	Output is correct
47	Correct	13 ms	12024 KB	Output is correct
48	Correct	13 ms	12024 KB	Output is correct
49	Correct	14 ms	12152 KB	Output is correct
50	Correct	13 ms	12100 KB	Output is correct
51	Correct	12 ms	12024 KB	Output is correct
52	Correct	13 ms	12024 KB	Output is correct
53	Correct	13 ms	12152 KB	Output is correct
54	Correct	13 ms	12016 KB	Output is correct
55	Correct	13 ms	12064 KB	Output is correct
56	Correct	13 ms	12024 KB	Output is correct
57	Correct	14 ms	12024 KB	Output is correct
58	Correct	14 ms	12152 KB	Output is correct
59	Correct	559 ms	36168 KB	Output is correct
60	Correct	585 ms	38720 KB	Output is correct
61	Correct	13 ms	12152 KB	Output is correct
62	Correct	13 ms	12152 KB	Output is correct
63	Correct	362 ms	33836 KB	Output is correct
64	Correct	16 ms	12536 KB	Output is correct
65	Correct	27 ms	13816 KB	Output is correct
66	Correct	173 ms	25184 KB	Output is correct
67	Correct	558 ms	57848 KB	Output is correct
68	Correct	564 ms	50672 KB	Output is correct
69	Correct	20 ms	12924 KB	Output is correct
70	Correct	109 ms	21316 KB	Output is correct
71	Correct	387 ms	41808 KB	Output is correct
72	Correct	364 ms	40672 KB	Output is correct
73	Correct	109 ms	19024 KB	Output is correct
74	Correct	513 ms	37716 KB	Output is correct
75	Correct	41 ms	15224 KB	Output is correct
76	Correct	359 ms	41528 KB	Output is correct
77	Correct	364 ms	41700 KB	Output is correct
78	Correct	48 ms	15352 KB	Output is correct
79	Correct	564 ms	45112 KB	Output is correct
80	Correct	14 ms	12280 KB	Output is correct
81	Correct	155 ms	21352 KB	Output is correct
82	Correct	449 ms	39600 KB	Output is correct
83	Correct	504 ms	37628 KB	Output is correct
84	Correct	505 ms	37712 KB	Output is correct
85	Correct	508 ms	37916 KB	Output is correct
86	Correct	527 ms	38816 KB	Output is correct
87	Correct	506 ms	38772 KB	Output is correct

Submission #148102

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