# |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
93779 |
2019-01-11T09:19:18 Z |
kjain_1810 |
Network (BOI15_net) |
C++11 |
|
7 ms |
5240 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=1e5+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);
^~~~~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
4 ms |
2680 KB |
Output is correct |
2 |
Correct |
4 ms |
2680 KB |
Output is correct |
3 |
Correct |
4 ms |
2680 KB |
Output is correct |
4 |
Correct |
3 ms |
2684 KB |
Output is correct |
5 |
Correct |
4 ms |
2680 KB |
Output is correct |
6 |
Correct |
4 ms |
2680 KB |
Output is correct |
7 |
Correct |
4 ms |
2680 KB |
Output is correct |
8 |
Correct |
4 ms |
2652 KB |
Output is correct |
9 |
Correct |
4 ms |
2680 KB |
Output is correct |
10 |
Correct |
4 ms |
2680 KB |
Output is correct |
11 |
Correct |
4 ms |
2680 KB |
Output is correct |
12 |
Correct |
5 ms |
2680 KB |
Output is correct |
13 |
Correct |
4 ms |
2680 KB |
Output is correct |
14 |
Correct |
4 ms |
2680 KB |
Output is correct |
15 |
Correct |
3 ms |
2680 KB |
Output is correct |
16 |
Correct |
5 ms |
2680 KB |
Output is correct |
17 |
Correct |
4 ms |
2680 KB |
Output is correct |
18 |
Correct |
4 ms |
2680 KB |
Output is correct |
19 |
Correct |
4 ms |
2680 KB |
Output is correct |
20 |
Correct |
3 ms |
2680 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
4 ms |
2680 KB |
Output is correct |
2 |
Correct |
4 ms |
2680 KB |
Output is correct |
3 |
Correct |
4 ms |
2680 KB |
Output is correct |
4 |
Correct |
3 ms |
2684 KB |
Output is correct |
5 |
Correct |
4 ms |
2680 KB |
Output is correct |
6 |
Correct |
4 ms |
2680 KB |
Output is correct |
7 |
Correct |
4 ms |
2680 KB |
Output is correct |
8 |
Correct |
4 ms |
2652 KB |
Output is correct |
9 |
Correct |
4 ms |
2680 KB |
Output is correct |
10 |
Correct |
4 ms |
2680 KB |
Output is correct |
11 |
Correct |
4 ms |
2680 KB |
Output is correct |
12 |
Correct |
5 ms |
2680 KB |
Output is correct |
13 |
Correct |
4 ms |
2680 KB |
Output is correct |
14 |
Correct |
4 ms |
2680 KB |
Output is correct |
15 |
Correct |
3 ms |
2680 KB |
Output is correct |
16 |
Correct |
5 ms |
2680 KB |
Output is correct |
17 |
Correct |
4 ms |
2680 KB |
Output is correct |
18 |
Correct |
4 ms |
2680 KB |
Output is correct |
19 |
Correct |
4 ms |
2680 KB |
Output is correct |
20 |
Correct |
3 ms |
2680 KB |
Output is correct |
21 |
Correct |
3 ms |
2684 KB |
Output is correct |
22 |
Correct |
4 ms |
2860 KB |
Output is correct |
23 |
Correct |
5 ms |
2808 KB |
Output is correct |
24 |
Correct |
4 ms |
2808 KB |
Output is correct |
25 |
Correct |
4 ms |
2808 KB |
Output is correct |
26 |
Correct |
4 ms |
2808 KB |
Output is correct |
27 |
Correct |
5 ms |
2812 KB |
Output is correct |
28 |
Correct |
5 ms |
2808 KB |
Output is correct |
29 |
Correct |
4 ms |
2808 KB |
Output is correct |
30 |
Correct |
4 ms |
2680 KB |
Output is correct |
31 |
Correct |
5 ms |
2748 KB |
Output is correct |
32 |
Correct |
4 ms |
2680 KB |
Output is correct |
33 |
Correct |
4 ms |
2680 KB |
Output is correct |
34 |
Correct |
4 ms |
2680 KB |
Output is correct |
35 |
Correct |
4 ms |
2680 KB |
Output is correct |
36 |
Correct |
4 ms |
2680 KB |
Output is correct |
37 |
Correct |
4 ms |
2652 KB |
Output is correct |
38 |
Correct |
4 ms |
2680 KB |
Output is correct |
39 |
Correct |
3 ms |
2680 KB |
Output is correct |
40 |
Correct |
4 ms |
2680 KB |
Output is correct |
41 |
Correct |
4 ms |
2684 KB |
Output is correct |
42 |
Correct |
4 ms |
2680 KB |
Output is correct |
43 |
Correct |
4 ms |
2680 KB |
Output is correct |
44 |
Correct |
4 ms |
2680 KB |
Output is correct |
45 |
Correct |
4 ms |
2680 KB |
Output is correct |
46 |
Correct |
4 ms |
2680 KB |
Output is correct |
47 |
Correct |
4 ms |
2680 KB |
Output is correct |
48 |
Correct |
4 ms |
2680 KB |
Output is correct |
49 |
Correct |
5 ms |
2680 KB |
Output is correct |
50 |
Correct |
4 ms |
2680 KB |
Output is correct |
51 |
Correct |
3 ms |
2680 KB |
Output is correct |
52 |
Correct |
4 ms |
2680 KB |
Output is correct |
53 |
Correct |
5 ms |
2680 KB |
Output is correct |
54 |
Correct |
4 ms |
2684 KB |
Output is correct |
55 |
Correct |
4 ms |
2680 KB |
Output is correct |
56 |
Correct |
4 ms |
2680 KB |
Output is correct |
57 |
Correct |
4 ms |
2680 KB |
Output is correct |
58 |
Correct |
4 ms |
2808 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
4 ms |
2680 KB |
Output is correct |
2 |
Correct |
4 ms |
2680 KB |
Output is correct |
3 |
Correct |
4 ms |
2680 KB |
Output is correct |
4 |
Correct |
3 ms |
2684 KB |
Output is correct |
5 |
Correct |
4 ms |
2680 KB |
Output is correct |
6 |
Correct |
4 ms |
2680 KB |
Output is correct |
7 |
Correct |
4 ms |
2680 KB |
Output is correct |
8 |
Correct |
4 ms |
2652 KB |
Output is correct |
9 |
Correct |
4 ms |
2680 KB |
Output is correct |
10 |
Correct |
4 ms |
2680 KB |
Output is correct |
11 |
Correct |
4 ms |
2680 KB |
Output is correct |
12 |
Correct |
5 ms |
2680 KB |
Output is correct |
13 |
Correct |
4 ms |
2680 KB |
Output is correct |
14 |
Correct |
4 ms |
2680 KB |
Output is correct |
15 |
Correct |
3 ms |
2680 KB |
Output is correct |
16 |
Correct |
5 ms |
2680 KB |
Output is correct |
17 |
Correct |
4 ms |
2680 KB |
Output is correct |
18 |
Correct |
4 ms |
2680 KB |
Output is correct |
19 |
Correct |
4 ms |
2680 KB |
Output is correct |
20 |
Correct |
3 ms |
2680 KB |
Output is correct |
21 |
Correct |
3 ms |
2684 KB |
Output is correct |
22 |
Correct |
4 ms |
2860 KB |
Output is correct |
23 |
Correct |
5 ms |
2808 KB |
Output is correct |
24 |
Correct |
4 ms |
2808 KB |
Output is correct |
25 |
Correct |
4 ms |
2808 KB |
Output is correct |
26 |
Correct |
4 ms |
2808 KB |
Output is correct |
27 |
Correct |
5 ms |
2812 KB |
Output is correct |
28 |
Correct |
5 ms |
2808 KB |
Output is correct |
29 |
Correct |
4 ms |
2808 KB |
Output is correct |
30 |
Correct |
4 ms |
2680 KB |
Output is correct |
31 |
Correct |
5 ms |
2748 KB |
Output is correct |
32 |
Correct |
4 ms |
2680 KB |
Output is correct |
33 |
Correct |
4 ms |
2680 KB |
Output is correct |
34 |
Correct |
4 ms |
2680 KB |
Output is correct |
35 |
Correct |
4 ms |
2680 KB |
Output is correct |
36 |
Correct |
4 ms |
2680 KB |
Output is correct |
37 |
Correct |
4 ms |
2652 KB |
Output is correct |
38 |
Correct |
4 ms |
2680 KB |
Output is correct |
39 |
Correct |
3 ms |
2680 KB |
Output is correct |
40 |
Correct |
4 ms |
2680 KB |
Output is correct |
41 |
Correct |
4 ms |
2684 KB |
Output is correct |
42 |
Correct |
4 ms |
2680 KB |
Output is correct |
43 |
Correct |
4 ms |
2680 KB |
Output is correct |
44 |
Correct |
4 ms |
2680 KB |
Output is correct |
45 |
Correct |
4 ms |
2680 KB |
Output is correct |
46 |
Correct |
4 ms |
2680 KB |
Output is correct |
47 |
Correct |
4 ms |
2680 KB |
Output is correct |
48 |
Correct |
4 ms |
2680 KB |
Output is correct |
49 |
Correct |
5 ms |
2680 KB |
Output is correct |
50 |
Correct |
4 ms |
2680 KB |
Output is correct |
51 |
Correct |
3 ms |
2680 KB |
Output is correct |
52 |
Correct |
4 ms |
2680 KB |
Output is correct |
53 |
Correct |
5 ms |
2680 KB |
Output is correct |
54 |
Correct |
4 ms |
2684 KB |
Output is correct |
55 |
Correct |
4 ms |
2680 KB |
Output is correct |
56 |
Correct |
4 ms |
2680 KB |
Output is correct |
57 |
Correct |
4 ms |
2680 KB |
Output is correct |
58 |
Correct |
4 ms |
2808 KB |
Output is correct |
59 |
Runtime error |
7 ms |
5240 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
60 |
Halted |
0 ms |
0 KB |
- |