| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 82584 |
2018-10-31T14:29:15 Z |
bash |
Network (BOI15_net) |
C++17 |
|
538 ms |
165056 KB |
/**
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
*/
#include <cstring>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <queue>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <cassert>
#define F first
#define S second
#define endl '\n'
#define deb(x) cout<<#x<<' '<<x<<endl;
#define pb push_back
/*
#ifdef IZI_KATKA
#define int __int64_t
#else
#define int __int64
#endif
*/
const long long MOD = 1e9 + 7;
const long long MAXN = 1e6 + 1;
using namespace std;
typedef long long ll;
long long readInt() {
bool minus1 = false;
long long result = 0;
char ch;
ch = getchar();
while (true) {
if (ch == '-') break;
if (ch >= '0' && ch <= '9') break;
ch = getchar();
}
if (ch == '-') minus1 = true; else result = ch-'0';
while (true) {
ch = getchar();
if (ch < '0' || ch > '9') break;
result = result*10 + (ch - '0');
}
if (minus1)
return -result;
else
return result;
}
vector <int> g[MAXN];
vector <int> ans;
void dfs(int v, int par) {
if (g[v].size() == 1) {
ans.pb(v);
}
for (int i : g[v]) {
if (i != par) {
dfs(i, v);
}
}
}
int main() {
#ifdef IZI_KATKA
assert(freopen("input", "r", stdin));
assert(freopen("output", "w", stdout));
#endif
int n = readInt();
for (int i = 1; i < n; i++) {
int u = readInt(), v = readInt();
g[u].pb(v);
g[v].pb(u);
}
dfs(1, 0);
int sz = ans.size();
if (sz % 2) {
cout << sz / 2 + 1 << endl;
for (int i = 0; i < sz / 2; i++) {
cout << ans[i] << ' ' << ans[i + sz / 2 + 1] << endl;
}
cout << 1 << ' ' << ans[sz / 2] << endl;
} else {
cout << sz / 2 << endl;
for (int i = 0; i < sz / 2; i++) {
cout << ans[i] << ' ' << ans[i + sz / 2] << endl;
}
}
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
22 ms |
23800 KB |
Output is correct |
| 2 |
Correct |
22 ms |
23804 KB |
Output is correct |
| 3 |
Correct |
26 ms |
23848 KB |
Output is correct |
| 4 |
Correct |
23 ms |
23892 KB |
Output is correct |
| 5 |
Correct |
22 ms |
23912 KB |
Output is correct |
| 6 |
Correct |
22 ms |
23912 KB |
Output is correct |
| 7 |
Correct |
22 ms |
23988 KB |
Output is correct |
| 8 |
Correct |
22 ms |
24116 KB |
Output is correct |
| 9 |
Correct |
22 ms |
24116 KB |
Output is correct |
| 10 |
Correct |
21 ms |
24116 KB |
Output is correct |
| 11 |
Correct |
23 ms |
24116 KB |
Output is correct |
| 12 |
Correct |
22 ms |
24128 KB |
Output is correct |
| 13 |
Correct |
22 ms |
24156 KB |
Output is correct |
| 14 |
Correct |
23 ms |
24176 KB |
Output is correct |
| 15 |
Correct |
23 ms |
24180 KB |
Output is correct |
| 16 |
Correct |
23 ms |
24264 KB |
Output is correct |
| 17 |
Correct |
27 ms |
24264 KB |
Output is correct |
| 18 |
Correct |
23 ms |
24336 KB |
Output is correct |
| 19 |
Correct |
24 ms |
24336 KB |
Output is correct |
| 20 |
Correct |
22 ms |
24336 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
22 ms |
23800 KB |
Output is correct |
| 2 |
Correct |
22 ms |
23804 KB |
Output is correct |
| 3 |
Correct |
26 ms |
23848 KB |
Output is correct |
| 4 |
Correct |
23 ms |
23892 KB |
Output is correct |
| 5 |
Correct |
22 ms |
23912 KB |
Output is correct |
| 6 |
Correct |
22 ms |
23912 KB |
Output is correct |
| 7 |
Correct |
22 ms |
23988 KB |
Output is correct |
| 8 |
Correct |
22 ms |
24116 KB |
Output is correct |
| 9 |
Correct |
22 ms |
24116 KB |
Output is correct |
| 10 |
Correct |
21 ms |
24116 KB |
Output is correct |
| 11 |
Correct |
23 ms |
24116 KB |
Output is correct |
| 12 |
Correct |
22 ms |
24128 KB |
Output is correct |
| 13 |
Correct |
22 ms |
24156 KB |
Output is correct |
| 14 |
Correct |
23 ms |
24176 KB |
Output is correct |
| 15 |
Correct |
23 ms |
24180 KB |
Output is correct |
| 16 |
Correct |
23 ms |
24264 KB |
Output is correct |
| 17 |
Correct |
27 ms |
24264 KB |
Output is correct |
| 18 |
Correct |
23 ms |
24336 KB |
Output is correct |
| 19 |
Correct |
24 ms |
24336 KB |
Output is correct |
| 20 |
Correct |
22 ms |
24336 KB |
Output is correct |
| 21 |
Correct |
22 ms |
24336 KB |
Output is correct |
| 22 |
Correct |
22 ms |
24352 KB |
Output is correct |
| 23 |
Correct |
23 ms |
24388 KB |
Output is correct |
| 24 |
Correct |
24 ms |
24424 KB |
Output is correct |
| 25 |
Correct |
23 ms |
24424 KB |
Output is correct |
| 26 |
Correct |
23 ms |
24476 KB |
Output is correct |
| 27 |
Correct |
23 ms |
24504 KB |
Output is correct |
| 28 |
Correct |
23 ms |
24524 KB |
Output is correct |
| 29 |
Correct |
23 ms |
24524 KB |
Output is correct |
| 30 |
Correct |
22 ms |
24524 KB |
Output is correct |
| 31 |
Correct |
23 ms |
24564 KB |
Output is correct |
| 32 |
Correct |
23 ms |
24564 KB |
Output is correct |
| 33 |
Correct |
23 ms |
24564 KB |
Output is correct |
| 34 |
Correct |
23 ms |
24564 KB |
Output is correct |
| 35 |
Correct |
22 ms |
24564 KB |
Output is correct |
| 36 |
Correct |
23 ms |
24564 KB |
Output is correct |
| 37 |
Correct |
23 ms |
24564 KB |
Output is correct |
| 38 |
Correct |
23 ms |
24728 KB |
Output is correct |
| 39 |
Correct |
28 ms |
24728 KB |
Output is correct |
| 40 |
Correct |
21 ms |
24728 KB |
Output is correct |
| 41 |
Correct |
21 ms |
24728 KB |
Output is correct |
| 42 |
Correct |
27 ms |
24728 KB |
Output is correct |
| 43 |
Correct |
24 ms |
24728 KB |
Output is correct |
| 44 |
Correct |
27 ms |
24728 KB |
Output is correct |
| 45 |
Correct |
21 ms |
24728 KB |
Output is correct |
| 46 |
Correct |
28 ms |
24728 KB |
Output is correct |
| 47 |
Correct |
22 ms |
24728 KB |
Output is correct |
| 48 |
Correct |
24 ms |
24728 KB |
Output is correct |
| 49 |
Correct |
23 ms |
24728 KB |
Output is correct |
| 50 |
Correct |
22 ms |
24728 KB |
Output is correct |
| 51 |
Correct |
22 ms |
24728 KB |
Output is correct |
| 52 |
Correct |
22 ms |
24728 KB |
Output is correct |
| 53 |
Correct |
22 ms |
24728 KB |
Output is correct |
| 54 |
Correct |
22 ms |
24728 KB |
Output is correct |
| 55 |
Correct |
26 ms |
24728 KB |
Output is correct |
| 56 |
Correct |
23 ms |
24728 KB |
Output is correct |
| 57 |
Correct |
23 ms |
24728 KB |
Output is correct |
| 58 |
Correct |
22 ms |
24728 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
22 ms |
23800 KB |
Output is correct |
| 2 |
Correct |
22 ms |
23804 KB |
Output is correct |
| 3 |
Correct |
26 ms |
23848 KB |
Output is correct |
| 4 |
Correct |
23 ms |
23892 KB |
Output is correct |
| 5 |
Correct |
22 ms |
23912 KB |
Output is correct |
| 6 |
Correct |
22 ms |
23912 KB |
Output is correct |
| 7 |
Correct |
22 ms |
23988 KB |
Output is correct |
| 8 |
Correct |
22 ms |
24116 KB |
Output is correct |
| 9 |
Correct |
22 ms |
24116 KB |
Output is correct |
| 10 |
Correct |
21 ms |
24116 KB |
Output is correct |
| 11 |
Correct |
23 ms |
24116 KB |
Output is correct |
| 12 |
Correct |
22 ms |
24128 KB |
Output is correct |
| 13 |
Correct |
22 ms |
24156 KB |
Output is correct |
| 14 |
Correct |
23 ms |
24176 KB |
Output is correct |
| 15 |
Correct |
23 ms |
24180 KB |
Output is correct |
| 16 |
Correct |
23 ms |
24264 KB |
Output is correct |
| 17 |
Correct |
27 ms |
24264 KB |
Output is correct |
| 18 |
Correct |
23 ms |
24336 KB |
Output is correct |
| 19 |
Correct |
24 ms |
24336 KB |
Output is correct |
| 20 |
Correct |
22 ms |
24336 KB |
Output is correct |
| 21 |
Correct |
22 ms |
24336 KB |
Output is correct |
| 22 |
Correct |
22 ms |
24352 KB |
Output is correct |
| 23 |
Correct |
23 ms |
24388 KB |
Output is correct |
| 24 |
Correct |
24 ms |
24424 KB |
Output is correct |
| 25 |
Correct |
23 ms |
24424 KB |
Output is correct |
| 26 |
Correct |
23 ms |
24476 KB |
Output is correct |
| 27 |
Correct |
23 ms |
24504 KB |
Output is correct |
| 28 |
Correct |
23 ms |
24524 KB |
Output is correct |
| 29 |
Correct |
23 ms |
24524 KB |
Output is correct |
| 30 |
Correct |
22 ms |
24524 KB |
Output is correct |
| 31 |
Correct |
23 ms |
24564 KB |
Output is correct |
| 32 |
Correct |
23 ms |
24564 KB |
Output is correct |
| 33 |
Correct |
23 ms |
24564 KB |
Output is correct |
| 34 |
Correct |
23 ms |
24564 KB |
Output is correct |
| 35 |
Correct |
22 ms |
24564 KB |
Output is correct |
| 36 |
Correct |
23 ms |
24564 KB |
Output is correct |
| 37 |
Correct |
23 ms |
24564 KB |
Output is correct |
| 38 |
Correct |
23 ms |
24728 KB |
Output is correct |
| 39 |
Correct |
28 ms |
24728 KB |
Output is correct |
| 40 |
Correct |
21 ms |
24728 KB |
Output is correct |
| 41 |
Correct |
21 ms |
24728 KB |
Output is correct |
| 42 |
Correct |
27 ms |
24728 KB |
Output is correct |
| 43 |
Correct |
24 ms |
24728 KB |
Output is correct |
| 44 |
Correct |
27 ms |
24728 KB |
Output is correct |
| 45 |
Correct |
21 ms |
24728 KB |
Output is correct |
| 46 |
Correct |
28 ms |
24728 KB |
Output is correct |
| 47 |
Correct |
22 ms |
24728 KB |
Output is correct |
| 48 |
Correct |
24 ms |
24728 KB |
Output is correct |
| 49 |
Correct |
23 ms |
24728 KB |
Output is correct |
| 50 |
Correct |
22 ms |
24728 KB |
Output is correct |
| 51 |
Correct |
22 ms |
24728 KB |
Output is correct |
| 52 |
Correct |
22 ms |
24728 KB |
Output is correct |
| 53 |
Correct |
22 ms |
24728 KB |
Output is correct |
| 54 |
Correct |
22 ms |
24728 KB |
Output is correct |
| 55 |
Correct |
26 ms |
24728 KB |
Output is correct |
| 56 |
Correct |
23 ms |
24728 KB |
Output is correct |
| 57 |
Correct |
23 ms |
24728 KB |
Output is correct |
| 58 |
Correct |
22 ms |
24728 KB |
Output is correct |
| 59 |
Correct |
354 ms |
48616 KB |
Output is correct |
| 60 |
Correct |
450 ms |
57212 KB |
Output is correct |
| 61 |
Correct |
23 ms |
57212 KB |
Output is correct |
| 62 |
Correct |
21 ms |
57212 KB |
Output is correct |
| 63 |
Correct |
306 ms |
58752 KB |
Output is correct |
| 64 |
Correct |
27 ms |
58752 KB |
Output is correct |
| 65 |
Correct |
32 ms |
58752 KB |
Output is correct |
| 66 |
Correct |
146 ms |
58752 KB |
Output is correct |
| 67 |
Correct |
489 ms |
80056 KB |
Output is correct |
| 68 |
Correct |
481 ms |
87460 KB |
Output is correct |
| 69 |
Correct |
29 ms |
87460 KB |
Output is correct |
| 70 |
Correct |
100 ms |
87460 KB |
Output is correct |
| 71 |
Correct |
296 ms |
90372 KB |
Output is correct |
| 72 |
Correct |
314 ms |
95884 KB |
Output is correct |
| 73 |
Correct |
102 ms |
95884 KB |
Output is correct |
| 74 |
Correct |
442 ms |
101028 KB |
Output is correct |
| 75 |
Correct |
46 ms |
101028 KB |
Output is correct |
| 76 |
Correct |
315 ms |
111996 KB |
Output is correct |
| 77 |
Correct |
296 ms |
119012 KB |
Output is correct |
| 78 |
Correct |
45 ms |
119012 KB |
Output is correct |
| 79 |
Correct |
492 ms |
129780 KB |
Output is correct |
| 80 |
Correct |
24 ms |
129780 KB |
Output is correct |
| 81 |
Correct |
115 ms |
129780 KB |
Output is correct |
| 82 |
Correct |
373 ms |
132728 KB |
Output is correct |
| 83 |
Correct |
431 ms |
137432 KB |
Output is correct |
| 84 |
Correct |
538 ms |
144028 KB |
Output is correct |
| 85 |
Correct |
432 ms |
150672 KB |
Output is correct |
| 86 |
Correct |
418 ms |
158364 KB |
Output is correct |
| 87 |
Correct |
440 ms |
165056 KB |
Output is correct |
