Submission #83443

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
83443	2018-11-07T16:35:57 Z	nikolapesic2802	Network (BOI15_net)	C++14	100 / 100	668 ms	153300 KB

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

#define ll long long
#define pb push_back

using namespace std;
using namespace __gnu_pbds;

typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> ordered_set; ///find_by_order(),order_of_key()

const int N=500005;
vector<vector<int> > graf(N);
vector<int> leaves;

void dfs(int tr,int par)
{
    if(graf[tr].size()==1)
        leaves.pb(tr);
    for(auto p:graf[tr])
    {
        if(p==par)
            continue;
        dfs(p,tr);
    }
}
int main()
{
    int n;
    scanf("%i",&n);
    for(int i=1;i<n;i++)
    {
        int a,b;
        scanf("%i %i",&a,&b);
        graf[a].pb(b);
        graf[b].pb(a);
    }
    dfs(1,-1);
    int t=leaves.size()/2;
    printf("%i\n",(leaves.size()+1)/2);
    for(int i=0;i<(leaves.size()+1)/2;i++)
    {
        printf("%i %i\n",leaves[i],leaves[i+t]);
    }
    return 0;
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:41:38: warning: format '%i' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=]
     printf("%i\n",(leaves.size()+1)/2);
                   ~~~~~~~~~~~~~~~~~~~^
net.cpp:42:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<(leaves.size()+1)/2;i++)
                 ~^~~~~~~~~~~~~~~~~~~~
net.cpp:31:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%i",&n);
     ~~~~~^~~~~~~~~
net.cpp:35:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%i %i",&a,&b);
         ~~~~~^~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	13 ms	12124 KB	Output is correct
2	Correct	13 ms	12160 KB	Output is correct
3	Correct	13 ms	12160 KB	Output is correct
4	Correct	17 ms	12160 KB	Output is correct
5	Correct	13 ms	12232 KB	Output is correct
6	Correct	13 ms	12232 KB	Output is correct
7	Correct	13 ms	12284 KB	Output is correct
8	Correct	15 ms	12352 KB	Output is correct
9	Correct	14 ms	12456 KB	Output is correct
10	Correct	13 ms	12456 KB	Output is correct
11	Correct	13 ms	12456 KB	Output is correct
12	Correct	13 ms	12456 KB	Output is correct
13	Correct	17 ms	12456 KB	Output is correct
14	Correct	14 ms	12460 KB	Output is correct
15	Correct	16 ms	12460 KB	Output is correct
16	Correct	13 ms	12460 KB	Output is correct
17	Correct	14 ms	12460 KB	Output is correct
18	Correct	16 ms	12460 KB	Output is correct
19	Correct	13 ms	12460 KB	Output is correct
20	Correct	14 ms	12528 KB	Output is correct

Subtask #2
45.0 / 45.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	13 ms	12124 KB	Output is correct
2	Correct	13 ms	12160 KB	Output is correct
3	Correct	13 ms	12160 KB	Output is correct
4	Correct	17 ms	12160 KB	Output is correct
5	Correct	13 ms	12232 KB	Output is correct
6	Correct	13 ms	12232 KB	Output is correct
7	Correct	13 ms	12284 KB	Output is correct
8	Correct	15 ms	12352 KB	Output is correct
9	Correct	14 ms	12456 KB	Output is correct
10	Correct	13 ms	12456 KB	Output is correct
11	Correct	13 ms	12456 KB	Output is correct
12	Correct	13 ms	12456 KB	Output is correct
13	Correct	17 ms	12456 KB	Output is correct
14	Correct	14 ms	12460 KB	Output is correct
15	Correct	16 ms	12460 KB	Output is correct
16	Correct	13 ms	12460 KB	Output is correct
17	Correct	14 ms	12460 KB	Output is correct
18	Correct	16 ms	12460 KB	Output is correct
19	Correct	13 ms	12460 KB	Output is correct
20	Correct	14 ms	12528 KB	Output is correct
21	Correct	28 ms	12528 KB	Output is correct
22	Correct	15 ms	12528 KB	Output is correct
23	Correct	14 ms	12568 KB	Output is correct
24	Correct	14 ms	12588 KB	Output is correct
25	Correct	14 ms	12608 KB	Output is correct
26	Correct	13 ms	12640 KB	Output is correct
27	Correct	14 ms	12668 KB	Output is correct
28	Correct	14 ms	12752 KB	Output is correct
29	Correct	14 ms	12752 KB	Output is correct
30	Correct	14 ms	12752 KB	Output is correct
31	Correct	14 ms	12872 KB	Output is correct
32	Correct	39 ms	12872 KB	Output is correct
33	Correct	13 ms	12872 KB	Output is correct
34	Correct	13 ms	12872 KB	Output is correct
35	Correct	13 ms	12872 KB	Output is correct
36	Correct	16 ms	12872 KB	Output is correct
37	Correct	14 ms	12872 KB	Output is correct
38	Correct	17 ms	12872 KB	Output is correct
39	Correct	13 ms	12872 KB	Output is correct
40	Correct	16 ms	12872 KB	Output is correct
41	Correct	16 ms	12872 KB	Output is correct
42	Correct	13 ms	12872 KB	Output is correct
43	Correct	17 ms	12884 KB	Output is correct
44	Correct	16 ms	12884 KB	Output is correct
45	Correct	16 ms	12884 KB	Output is correct
46	Correct	13 ms	12884 KB	Output is correct
47	Correct	12 ms	12884 KB	Output is correct
48	Correct	16 ms	12884 KB	Output is correct
49	Correct	13 ms	12896 KB	Output is correct
50	Correct	13 ms	12896 KB	Output is correct
51	Correct	13 ms	12896 KB	Output is correct
52	Correct	15 ms	12896 KB	Output is correct
53	Correct	13 ms	12920 KB	Output is correct
54	Correct	12 ms	12920 KB	Output is correct
55	Correct	13 ms	12920 KB	Output is correct
56	Correct	12 ms	12920 KB	Output is correct
57	Correct	13 ms	12920 KB	Output is correct
58	Correct	13 ms	12956 KB	Output is correct

Subtask #3
37.0 / 37.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	13 ms	12124 KB	Output is correct
2	Correct	13 ms	12160 KB	Output is correct
3	Correct	13 ms	12160 KB	Output is correct
4	Correct	17 ms	12160 KB	Output is correct
5	Correct	13 ms	12232 KB	Output is correct
6	Correct	13 ms	12232 KB	Output is correct
7	Correct	13 ms	12284 KB	Output is correct
8	Correct	15 ms	12352 KB	Output is correct
9	Correct	14 ms	12456 KB	Output is correct
10	Correct	13 ms	12456 KB	Output is correct
11	Correct	13 ms	12456 KB	Output is correct
12	Correct	13 ms	12456 KB	Output is correct
13	Correct	17 ms	12456 KB	Output is correct
14	Correct	14 ms	12460 KB	Output is correct
15	Correct	16 ms	12460 KB	Output is correct
16	Correct	13 ms	12460 KB	Output is correct
17	Correct	14 ms	12460 KB	Output is correct
18	Correct	16 ms	12460 KB	Output is correct
19	Correct	13 ms	12460 KB	Output is correct
20	Correct	14 ms	12528 KB	Output is correct
21	Correct	28 ms	12528 KB	Output is correct
22	Correct	15 ms	12528 KB	Output is correct
23	Correct	14 ms	12568 KB	Output is correct
24	Correct	14 ms	12588 KB	Output is correct
25	Correct	14 ms	12608 KB	Output is correct
26	Correct	13 ms	12640 KB	Output is correct
27	Correct	14 ms	12668 KB	Output is correct
28	Correct	14 ms	12752 KB	Output is correct
29	Correct	14 ms	12752 KB	Output is correct
30	Correct	14 ms	12752 KB	Output is correct
31	Correct	14 ms	12872 KB	Output is correct
32	Correct	39 ms	12872 KB	Output is correct
33	Correct	13 ms	12872 KB	Output is correct
34	Correct	13 ms	12872 KB	Output is correct
35	Correct	13 ms	12872 KB	Output is correct
36	Correct	16 ms	12872 KB	Output is correct
37	Correct	14 ms	12872 KB	Output is correct
38	Correct	17 ms	12872 KB	Output is correct
39	Correct	13 ms	12872 KB	Output is correct
40	Correct	16 ms	12872 KB	Output is correct
41	Correct	16 ms	12872 KB	Output is correct
42	Correct	13 ms	12872 KB	Output is correct
43	Correct	17 ms	12884 KB	Output is correct
44	Correct	16 ms	12884 KB	Output is correct
45	Correct	16 ms	12884 KB	Output is correct
46	Correct	13 ms	12884 KB	Output is correct
47	Correct	12 ms	12884 KB	Output is correct
48	Correct	16 ms	12884 KB	Output is correct
49	Correct	13 ms	12896 KB	Output is correct
50	Correct	13 ms	12896 KB	Output is correct
51	Correct	13 ms	12896 KB	Output is correct
52	Correct	15 ms	12896 KB	Output is correct
53	Correct	13 ms	12920 KB	Output is correct
54	Correct	12 ms	12920 KB	Output is correct
55	Correct	13 ms	12920 KB	Output is correct
56	Correct	12 ms	12920 KB	Output is correct
57	Correct	13 ms	12920 KB	Output is correct
58	Correct	13 ms	12956 KB	Output is correct
59	Correct	460 ms	36972 KB	Output is correct
60	Correct	543 ms	45548 KB	Output is correct
61	Correct	13 ms	45548 KB	Output is correct
62	Correct	13 ms	45548 KB	Output is correct
63	Correct	398 ms	47080 KB	Output is correct
64	Correct	17 ms	47080 KB	Output is correct
65	Correct	30 ms	47080 KB	Output is correct
66	Correct	208 ms	47080 KB	Output is correct
67	Correct	643 ms	68384 KB	Output is correct
68	Correct	574 ms	75744 KB	Output is correct
69	Correct	20 ms	75744 KB	Output is correct
70	Correct	116 ms	75744 KB	Output is correct
71	Correct	422 ms	78636 KB	Output is correct
72	Correct	382 ms	84384 KB	Output is correct
73	Correct	122 ms	84384 KB	Output is correct
74	Correct	571 ms	89408 KB	Output is correct
75	Correct	39 ms	89408 KB	Output is correct
76	Correct	399 ms	100272 KB	Output is correct
77	Correct	388 ms	107276 KB	Output is correct
78	Correct	45 ms	107276 KB	Output is correct
79	Correct	668 ms	117944 KB	Output is correct
80	Correct	16 ms	117944 KB	Output is correct
81	Correct	160 ms	117944 KB	Output is correct
82	Correct	486 ms	121008 KB	Output is correct
83	Correct	611 ms	125684 KB	Output is correct
84	Correct	598 ms	132280 KB	Output is correct
85	Correct	555 ms	138896 KB	Output is correct
86	Correct	541 ms	146584 KB	Output is correct
87	Correct	528 ms	153300 KB	Output is correct

Submission #83443

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