답안 #93780 :: oj.uz

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
93780	2019-01-11T09:20:04 Z	kjain_1810	Network (BOI15_net)	C++11	100 / 100	678 ms	52532 KB

#include <bits/stdc++.h>
#define pb push_back
#define f first
#define s second
#define ind(a) scanf("%d", &a)
#define inlld(a) scanf("%lld", &a)
#define ind2(a, b) scanf("%d%d", &a, &b)
#define inlld2(a, b) scanf("%lld%lld", &a, &b)
#define ind3(a, b, c) scanf("%d%d%d", &a, &b, &c)
#define inlld3(a, b, c) scanf("%lld%lld%lld", &a, &b, &c)

using namespace std;

const int N=5e5+5;
const int MOD=1e9+7;

typedef long long ll;
typedef long double ld;

ll n;
vector<ll>adj[N], leaf, nonleaf;

void dfs(ll u, ll p)
{
    if(adj[u].size()==1)
        leaf.pb(u);
    else
        nonleaf.pb(u);
    for(auto v:adj[u])
        if(v!=p)
            dfs(v, u);
}

int main() 
{
    inlld(n);
    for(ll a=1; a<n; a++)
    {
        ll u, v;
        inlld2(u, v);
        adj[u].pb(v);
        adj[v].pb(u);
    }
    for(ll a=1; a<=n; a++)
        if(adj[a].size()>1)
        {
            dfs(a, 0);
            break;
        }
    ll ans=((int)leaf.size()+1)/2;
    printf("%lld\n", ans);
    for(ll a=0; a*2+1<leaf.size(); a++)
        printf("%lld %lld\n", leaf[a], leaf[a+(leaf.size()+1)/2]);
    if(leaf.size()%2==1)
        printf("%lld %lld\n", leaf[leaf.size()/2], leaf[0]);
    return 0;
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:52:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(ll a=0; a*2+1<leaf.size(); a++)
                 ~~~~~^~~~~~~~~~~~
net.cpp:6:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 #define inlld(a) scanf("%lld", &a)
                  ~~~~~^~~~~~~~~~~~
net.cpp:36:5: note: in expansion of macro 'inlld'
     inlld(n);
     ^~~~~
net.cpp:8:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 #define inlld2(a, b) scanf("%lld%lld", &a, &b)
                      ~~~~~^~~~~~~~~~~~~~~~~~~~
net.cpp:40:9: note: in expansion of macro 'inlld2'
         inlld2(u, v);
         ^~~~~~

Subtask #1
18.0 / 18.0

#	결과	실행 시간	메모리	Grader output
1	Correct	10 ms	12028 KB	Output is correct
2	Correct	11 ms	12024 KB	Output is correct
3	Correct	10 ms	12100 KB	Output is correct
4	Correct	10 ms	12072 KB	Output is correct
5	Correct	10 ms	12024 KB	Output is correct
6	Correct	10 ms	12028 KB	Output is correct
7	Correct	10 ms	12024 KB	Output is correct
8	Correct	12 ms	12024 KB	Output is correct
9	Correct	10 ms	12024 KB	Output is correct
10	Correct	9 ms	12024 KB	Output is correct
11	Correct	10 ms	12024 KB	Output is correct
12	Correct	10 ms	12024 KB	Output is correct
13	Correct	10 ms	12068 KB	Output is correct
14	Correct	10 ms	12024 KB	Output is correct
15	Correct	10 ms	12024 KB	Output is correct
16	Correct	10 ms	12152 KB	Output is correct
17	Correct	10 ms	12024 KB	Output is correct
18	Correct	10 ms	12024 KB	Output is correct
19	Correct	10 ms	12024 KB	Output is correct
20	Correct	10 ms	12024 KB	Output is correct

Subtask #2
45.0 / 45.0

#	결과	실행 시간	메모리	Grader output
1	Correct	10 ms	12028 KB	Output is correct
2	Correct	11 ms	12024 KB	Output is correct
3	Correct	10 ms	12100 KB	Output is correct
4	Correct	10 ms	12072 KB	Output is correct
5	Correct	10 ms	12024 KB	Output is correct
6	Correct	10 ms	12028 KB	Output is correct
7	Correct	10 ms	12024 KB	Output is correct
8	Correct	12 ms	12024 KB	Output is correct
9	Correct	10 ms	12024 KB	Output is correct
10	Correct	9 ms	12024 KB	Output is correct
11	Correct	10 ms	12024 KB	Output is correct
12	Correct	10 ms	12024 KB	Output is correct
13	Correct	10 ms	12068 KB	Output is correct
14	Correct	10 ms	12024 KB	Output is correct
15	Correct	10 ms	12024 KB	Output is correct
16	Correct	10 ms	12152 KB	Output is correct
17	Correct	10 ms	12024 KB	Output is correct
18	Correct	10 ms	12024 KB	Output is correct
19	Correct	10 ms	12024 KB	Output is correct
20	Correct	10 ms	12024 KB	Output is correct
21	Correct	10 ms	12024 KB	Output is correct
22	Correct	14 ms	12152 KB	Output is correct
23	Correct	13 ms	12152 KB	Output is correct
24	Correct	11 ms	12156 KB	Output is correct
25	Correct	11 ms	12152 KB	Output is correct
26	Correct	11 ms	12152 KB	Output is correct
27	Correct	21 ms	12152 KB	Output is correct
28	Correct	10 ms	12152 KB	Output is correct
29	Correct	12 ms	12152 KB	Output is correct
30	Correct	10 ms	12024 KB	Output is correct
31	Correct	11 ms	12124 KB	Output is correct
32	Correct	10 ms	12024 KB	Output is correct
33	Correct	20 ms	11996 KB	Output is correct
34	Correct	10 ms	12024 KB	Output is correct
35	Correct	19 ms	12052 KB	Output is correct
36	Correct	13 ms	12152 KB	Output is correct
37	Correct	10 ms	12152 KB	Output is correct
38	Correct	10 ms	12152 KB	Output is correct
39	Correct	10 ms	12024 KB	Output is correct
40	Correct	10 ms	12024 KB	Output is correct
41	Correct	10 ms	12024 KB	Output is correct
42	Correct	10 ms	12152 KB	Output is correct
43	Correct	11 ms	12152 KB	Output is correct
44	Correct	10 ms	12024 KB	Output is correct
45	Correct	10 ms	12024 KB	Output is correct
46	Correct	11 ms	12028 KB	Output is correct
47	Correct	11 ms	12080 KB	Output is correct
48	Correct	10 ms	12024 KB	Output is correct
49	Correct	11 ms	12152 KB	Output is correct
50	Correct	10 ms	12024 KB	Output is correct
51	Correct	10 ms	12024 KB	Output is correct
52	Correct	10 ms	12152 KB	Output is correct
53	Correct	11 ms	12152 KB	Output is correct
54	Correct	10 ms	12024 KB	Output is correct
55	Correct	10 ms	12152 KB	Output is correct
56	Correct	10 ms	12024 KB	Output is correct
57	Correct	11 ms	12152 KB	Output is correct
58	Correct	11 ms	12152 KB	Output is correct

Subtask #3
37.0 / 37.0

#	결과	실행 시간	메모리	Grader output
1	Correct	10 ms	12028 KB	Output is correct
2	Correct	11 ms	12024 KB	Output is correct
3	Correct	10 ms	12100 KB	Output is correct
4	Correct	10 ms	12072 KB	Output is correct
5	Correct	10 ms	12024 KB	Output is correct
6	Correct	10 ms	12028 KB	Output is correct
7	Correct	10 ms	12024 KB	Output is correct
8	Correct	12 ms	12024 KB	Output is correct
9	Correct	10 ms	12024 KB	Output is correct
10	Correct	9 ms	12024 KB	Output is correct
11	Correct	10 ms	12024 KB	Output is correct
12	Correct	10 ms	12024 KB	Output is correct
13	Correct	10 ms	12068 KB	Output is correct
14	Correct	10 ms	12024 KB	Output is correct
15	Correct	10 ms	12024 KB	Output is correct
16	Correct	10 ms	12152 KB	Output is correct
17	Correct	10 ms	12024 KB	Output is correct
18	Correct	10 ms	12024 KB	Output is correct
19	Correct	10 ms	12024 KB	Output is correct
20	Correct	10 ms	12024 KB	Output is correct
21	Correct	10 ms	12024 KB	Output is correct
22	Correct	14 ms	12152 KB	Output is correct
23	Correct	13 ms	12152 KB	Output is correct
24	Correct	11 ms	12156 KB	Output is correct
25	Correct	11 ms	12152 KB	Output is correct
26	Correct	11 ms	12152 KB	Output is correct
27	Correct	21 ms	12152 KB	Output is correct
28	Correct	10 ms	12152 KB	Output is correct
29	Correct	12 ms	12152 KB	Output is correct
30	Correct	10 ms	12024 KB	Output is correct
31	Correct	11 ms	12124 KB	Output is correct
32	Correct	10 ms	12024 KB	Output is correct
33	Correct	20 ms	11996 KB	Output is correct
34	Correct	10 ms	12024 KB	Output is correct
35	Correct	19 ms	12052 KB	Output is correct
36	Correct	13 ms	12152 KB	Output is correct
37	Correct	10 ms	12152 KB	Output is correct
38	Correct	10 ms	12152 KB	Output is correct
39	Correct	10 ms	12024 KB	Output is correct
40	Correct	10 ms	12024 KB	Output is correct
41	Correct	10 ms	12024 KB	Output is correct
42	Correct	10 ms	12152 KB	Output is correct
43	Correct	11 ms	12152 KB	Output is correct
44	Correct	10 ms	12024 KB	Output is correct
45	Correct	10 ms	12024 KB	Output is correct
46	Correct	11 ms	12028 KB	Output is correct
47	Correct	11 ms	12080 KB	Output is correct
48	Correct	10 ms	12024 KB	Output is correct
49	Correct	11 ms	12152 KB	Output is correct
50	Correct	10 ms	12024 KB	Output is correct
51	Correct	10 ms	12024 KB	Output is correct
52	Correct	10 ms	12152 KB	Output is correct
53	Correct	11 ms	12152 KB	Output is correct
54	Correct	10 ms	12024 KB	Output is correct
55	Correct	10 ms	12152 KB	Output is correct
56	Correct	10 ms	12024 KB	Output is correct
57	Correct	11 ms	12152 KB	Output is correct
58	Correct	11 ms	12152 KB	Output is correct
59	Correct	360 ms	43836 KB	Output is correct
60	Correct	478 ms	44672 KB	Output is correct
61	Correct	10 ms	12052 KB	Output is correct
62	Correct	10 ms	12152 KB	Output is correct
63	Correct	339 ms	38376 KB	Output is correct
64	Correct	13 ms	12636 KB	Output is correct
65	Correct	23 ms	14336 KB	Output is correct
66	Correct	163 ms	29592 KB	Output is correct
67	Correct	520 ms	51008 KB	Output is correct
68	Correct	678 ms	52532 KB	Output is correct
69	Correct	16 ms	13176 KB	Output is correct
70	Correct	113 ms	24420 KB	Output is correct
71	Correct	379 ms	45784 KB	Output is correct
72	Correct	400 ms	48348 KB	Output is correct
73	Correct	136 ms	20624 KB	Output is correct
74	Correct	602 ms	43060 KB	Output is correct
75	Correct	42 ms	15848 KB	Output is correct
76	Correct	354 ms	47324 KB	Output is correct
77	Correct	311 ms	45516 KB	Output is correct
78	Correct	45 ms	16312 KB	Output is correct
79	Correct	515 ms	49432 KB	Output is correct
80	Correct	14 ms	12412 KB	Output is correct
81	Correct	105 ms	23056 KB	Output is correct
82	Correct	390 ms	46440 KB	Output is correct
83	Correct	582 ms	43272 KB	Output is correct
84	Correct	483 ms	43216 KB	Output is correct
85	Correct	507 ms	43356 KB	Output is correct
86	Correct	446 ms	44672 KB	Output is correct
87	Correct	502 ms	44748 KB	Output is correct

답안 #93780

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