# |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
876006 |
2023-11-21T04:42:04 Z |
vjudge1 |
Network (BOI15_net) |
C++17 |
|
356 ms |
51684 KB |
#include <iostream>
#include <vector>
#include <tuple>
#include <queue>
#include <stack>
#include <deque>
#include <set>
#include <map>
#include <cmath>
#include <random>
#include <string>
#include <cassert>
#include <climits>
#include <algorithm>
#include <unordered_set>
#include <unordered_map>
using namespace std;
#define ll long long
#define f first
#define s second
void __print(int x) { cerr << x; }
void __print(long x) { cerr << x; }
void __print(long long x) { cerr << x; }
void __print(unsigned x) { cerr << x; }
void __print(unsigned long x) { cerr << x; }
void __print(unsigned long long x) { cerr << x; }
void __print(float x) { cerr << x; }
void __print(double x) { cerr << x; }
void __print(long double x) { cerr << x; }
void __print(char x) { cerr << '\'' << x << '\''; }
void __print(const char *x) { cerr << '\"' << x << '\"'; }
void __print(const string &x) { cerr << '\"' << x << '\"'; }
void __print(bool x) { cerr << (x ? "true" : "false"); }
template<typename A> void __print(const A &x);
template<typename A, typename B> void __print(const pair<A, B> &p);
template<typename... A> void __print(const tuple<A...> &t);
template<typename T> void __print(stack<T> s);
template<typename T> void __print(queue<T> q);
template<typename T, typename... U> void __print(priority_queue<T, U...> q);
template<typename A> void __print(const A &x) {
bool first = true;
cerr << '{';
for (const auto &i : x) {
cerr << (first ? "" : ","), __print(i);
first = false;
}
cerr << '}';
}
template<typename A, typename B> void __print(const pair<A, B> &p) {
cerr << '(';
__print(p.f);
cerr << ',';
__print(p.s);
cerr << ')';
}
template<typename... A> void __print(const tuple<A...> &t) {
bool first = true;
cerr << '(';
apply([&first] (const auto &...args) { ((cerr << (first ? "" : ","), __print(args), first = false), ...); }, t);
cerr << ')';
}
template<typename T> void __print(stack<T> s) {
vector<T> debugVector;
while (!s.empty()) {
T t = s.top();
debugVector.push_back(t);
s.pop();
}
reverse(debugVector.begin(), debugVector.end());
__print(debugVector);
}
template<typename T> void __print(queue<T> q) {
vector<T> debugVector;
while (!q.empty()) {
T t = q.front();
debugVector.push_back(t);
q.pop();
}
__print(debugVector);
}
template<typename T, typename... U> void __print(priority_queue<T, U...> q) {
vector<T> debugVector;
while (!q.empty()) {
T t = q.top();
debugVector.push_back(t);
q.pop();
}
__print(debugVector);
}
void _print() { cerr << "]\n"; }
template <typename Head, typename... Tail> void _print(const Head &H, const Tail &...T) {
__print(H);
if (sizeof...(T)) cerr << ", ";
_print(T...);
}
#ifdef DEBUG
#define D(...) cerr << "Line: " << __LINE__ << " [" << #__VA_ARGS__ << "] = ["; _print(__VA_ARGS__)
#else
#define D(...)
#endif
int n, deg[500005], rt, idx, in[500005];
vector<int> adj[500005];
vector<pair<int, int>> leaf, ret;
void dfs(int curr, int par) {
in[curr] = idx++;
for (int i : adj[curr]) {
if (i == par) continue;
dfs(i, curr);
}
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
cin >> n;
for (int i = 0, a, b; i < n - 1; i++) {
cin >> a >> b;
adj[a].push_back(b);
adj[b].push_back(a);
deg[a]++;
deg[b]++;
}
for (int i = 1; i <= n; i++) {
if (deg[i] > 1) {
rt = i;
break;
}
}
dfs(rt, -1);
for (int i = 1; i <= n; i++) {
if (deg[i] == 1) {
leaf.push_back({in[i], i});
}
}
sort(leaf.begin(), leaf.end());
for (int i = 0; i < leaf.size() / 2; i++) {
ret.push_back({leaf[i].s, leaf[i + leaf.size() / 2].s});
}
if (leaf.size() % 2) ret.push_back({leaf.back().s, leaf[0].s});
cout << ret.size() << "\n";
for (auto [a, b] : ret) {
cout << a << " " << b << "\n";
}
}
Compilation message
net.cpp: In function 'int main()':
net.cpp:156:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
156 | for (int i = 0; i < leaf.size() / 2; i++) {
| ~~^~~~~~~~~~~~~~~~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
3 ms |
14940 KB |
Output is correct |
2 |
Correct |
3 ms |
14940 KB |
Output is correct |
3 |
Correct |
3 ms |
14936 KB |
Output is correct |
4 |
Correct |
3 ms |
14940 KB |
Output is correct |
5 |
Correct |
3 ms |
14940 KB |
Output is correct |
6 |
Correct |
3 ms |
14940 KB |
Output is correct |
7 |
Correct |
4 ms |
14940 KB |
Output is correct |
8 |
Correct |
3 ms |
14940 KB |
Output is correct |
9 |
Correct |
3 ms |
14940 KB |
Output is correct |
10 |
Correct |
3 ms |
14940 KB |
Output is correct |
11 |
Correct |
3 ms |
14940 KB |
Output is correct |
12 |
Correct |
3 ms |
14940 KB |
Output is correct |
13 |
Correct |
3 ms |
14940 KB |
Output is correct |
14 |
Correct |
3 ms |
14940 KB |
Output is correct |
15 |
Correct |
3 ms |
14936 KB |
Output is correct |
16 |
Correct |
3 ms |
14940 KB |
Output is correct |
17 |
Correct |
3 ms |
14944 KB |
Output is correct |
18 |
Correct |
3 ms |
14940 KB |
Output is correct |
19 |
Correct |
3 ms |
15192 KB |
Output is correct |
20 |
Correct |
3 ms |
14940 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
3 ms |
14940 KB |
Output is correct |
2 |
Correct |
3 ms |
14940 KB |
Output is correct |
3 |
Correct |
3 ms |
14936 KB |
Output is correct |
4 |
Correct |
3 ms |
14940 KB |
Output is correct |
5 |
Correct |
3 ms |
14940 KB |
Output is correct |
6 |
Correct |
3 ms |
14940 KB |
Output is correct |
7 |
Correct |
4 ms |
14940 KB |
Output is correct |
8 |
Correct |
3 ms |
14940 KB |
Output is correct |
9 |
Correct |
3 ms |
14940 KB |
Output is correct |
10 |
Correct |
3 ms |
14940 KB |
Output is correct |
11 |
Correct |
3 ms |
14940 KB |
Output is correct |
12 |
Correct |
3 ms |
14940 KB |
Output is correct |
13 |
Correct |
3 ms |
14940 KB |
Output is correct |
14 |
Correct |
3 ms |
14940 KB |
Output is correct |
15 |
Correct |
3 ms |
14936 KB |
Output is correct |
16 |
Correct |
3 ms |
14940 KB |
Output is correct |
17 |
Correct |
3 ms |
14944 KB |
Output is correct |
18 |
Correct |
3 ms |
14940 KB |
Output is correct |
19 |
Correct |
3 ms |
15192 KB |
Output is correct |
20 |
Correct |
3 ms |
14940 KB |
Output is correct |
21 |
Correct |
3 ms |
14940 KB |
Output is correct |
22 |
Correct |
3 ms |
14940 KB |
Output is correct |
23 |
Correct |
3 ms |
14940 KB |
Output is correct |
24 |
Correct |
3 ms |
14940 KB |
Output is correct |
25 |
Correct |
3 ms |
14940 KB |
Output is correct |
26 |
Correct |
3 ms |
15192 KB |
Output is correct |
27 |
Correct |
3 ms |
14940 KB |
Output is correct |
28 |
Correct |
3 ms |
14936 KB |
Output is correct |
29 |
Correct |
3 ms |
14940 KB |
Output is correct |
30 |
Correct |
3 ms |
14940 KB |
Output is correct |
31 |
Correct |
4 ms |
14940 KB |
Output is correct |
32 |
Correct |
3 ms |
14940 KB |
Output is correct |
33 |
Correct |
3 ms |
14936 KB |
Output is correct |
34 |
Correct |
3 ms |
14940 KB |
Output is correct |
35 |
Correct |
3 ms |
14940 KB |
Output is correct |
36 |
Correct |
3 ms |
14940 KB |
Output is correct |
37 |
Correct |
3 ms |
14936 KB |
Output is correct |
38 |
Correct |
3 ms |
14972 KB |
Output is correct |
39 |
Correct |
3 ms |
14940 KB |
Output is correct |
40 |
Correct |
3 ms |
14940 KB |
Output is correct |
41 |
Correct |
3 ms |
14940 KB |
Output is correct |
42 |
Correct |
3 ms |
14940 KB |
Output is correct |
43 |
Correct |
3 ms |
14940 KB |
Output is correct |
44 |
Correct |
3 ms |
14940 KB |
Output is correct |
45 |
Correct |
3 ms |
14940 KB |
Output is correct |
46 |
Correct |
3 ms |
14940 KB |
Output is correct |
47 |
Correct |
3 ms |
14940 KB |
Output is correct |
48 |
Correct |
3 ms |
14940 KB |
Output is correct |
49 |
Correct |
3 ms |
14940 KB |
Output is correct |
50 |
Correct |
3 ms |
14940 KB |
Output is correct |
51 |
Correct |
3 ms |
14940 KB |
Output is correct |
52 |
Correct |
3 ms |
14936 KB |
Output is correct |
53 |
Correct |
3 ms |
14940 KB |
Output is correct |
54 |
Correct |
2 ms |
14940 KB |
Output is correct |
55 |
Correct |
3 ms |
14940 KB |
Output is correct |
56 |
Correct |
3 ms |
14940 KB |
Output is correct |
57 |
Correct |
3 ms |
14940 KB |
Output is correct |
58 |
Correct |
3 ms |
14940 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
3 ms |
14940 KB |
Output is correct |
2 |
Correct |
3 ms |
14940 KB |
Output is correct |
3 |
Correct |
3 ms |
14936 KB |
Output is correct |
4 |
Correct |
3 ms |
14940 KB |
Output is correct |
5 |
Correct |
3 ms |
14940 KB |
Output is correct |
6 |
Correct |
3 ms |
14940 KB |
Output is correct |
7 |
Correct |
4 ms |
14940 KB |
Output is correct |
8 |
Correct |
3 ms |
14940 KB |
Output is correct |
9 |
Correct |
3 ms |
14940 KB |
Output is correct |
10 |
Correct |
3 ms |
14940 KB |
Output is correct |
11 |
Correct |
3 ms |
14940 KB |
Output is correct |
12 |
Correct |
3 ms |
14940 KB |
Output is correct |
13 |
Correct |
3 ms |
14940 KB |
Output is correct |
14 |
Correct |
3 ms |
14940 KB |
Output is correct |
15 |
Correct |
3 ms |
14936 KB |
Output is correct |
16 |
Correct |
3 ms |
14940 KB |
Output is correct |
17 |
Correct |
3 ms |
14944 KB |
Output is correct |
18 |
Correct |
3 ms |
14940 KB |
Output is correct |
19 |
Correct |
3 ms |
15192 KB |
Output is correct |
20 |
Correct |
3 ms |
14940 KB |
Output is correct |
21 |
Correct |
3 ms |
14940 KB |
Output is correct |
22 |
Correct |
3 ms |
14940 KB |
Output is correct |
23 |
Correct |
3 ms |
14940 KB |
Output is correct |
24 |
Correct |
3 ms |
14940 KB |
Output is correct |
25 |
Correct |
3 ms |
14940 KB |
Output is correct |
26 |
Correct |
3 ms |
15192 KB |
Output is correct |
27 |
Correct |
3 ms |
14940 KB |
Output is correct |
28 |
Correct |
3 ms |
14936 KB |
Output is correct |
29 |
Correct |
3 ms |
14940 KB |
Output is correct |
30 |
Correct |
3 ms |
14940 KB |
Output is correct |
31 |
Correct |
4 ms |
14940 KB |
Output is correct |
32 |
Correct |
3 ms |
14940 KB |
Output is correct |
33 |
Correct |
3 ms |
14936 KB |
Output is correct |
34 |
Correct |
3 ms |
14940 KB |
Output is correct |
35 |
Correct |
3 ms |
14940 KB |
Output is correct |
36 |
Correct |
3 ms |
14940 KB |
Output is correct |
37 |
Correct |
3 ms |
14936 KB |
Output is correct |
38 |
Correct |
3 ms |
14972 KB |
Output is correct |
39 |
Correct |
3 ms |
14940 KB |
Output is correct |
40 |
Correct |
3 ms |
14940 KB |
Output is correct |
41 |
Correct |
3 ms |
14940 KB |
Output is correct |
42 |
Correct |
3 ms |
14940 KB |
Output is correct |
43 |
Correct |
3 ms |
14940 KB |
Output is correct |
44 |
Correct |
3 ms |
14940 KB |
Output is correct |
45 |
Correct |
3 ms |
14940 KB |
Output is correct |
46 |
Correct |
3 ms |
14940 KB |
Output is correct |
47 |
Correct |
3 ms |
14940 KB |
Output is correct |
48 |
Correct |
3 ms |
14940 KB |
Output is correct |
49 |
Correct |
3 ms |
14940 KB |
Output is correct |
50 |
Correct |
3 ms |
14940 KB |
Output is correct |
51 |
Correct |
3 ms |
14940 KB |
Output is correct |
52 |
Correct |
3 ms |
14936 KB |
Output is correct |
53 |
Correct |
3 ms |
14940 KB |
Output is correct |
54 |
Correct |
2 ms |
14940 KB |
Output is correct |
55 |
Correct |
3 ms |
14940 KB |
Output is correct |
56 |
Correct |
3 ms |
14940 KB |
Output is correct |
57 |
Correct |
3 ms |
14940 KB |
Output is correct |
58 |
Correct |
3 ms |
14940 KB |
Output is correct |
59 |
Correct |
243 ms |
45344 KB |
Output is correct |
60 |
Correct |
295 ms |
47664 KB |
Output is correct |
61 |
Correct |
3 ms |
14936 KB |
Output is correct |
62 |
Correct |
3 ms |
14940 KB |
Output is correct |
63 |
Correct |
216 ms |
41972 KB |
Output is correct |
64 |
Correct |
4 ms |
15196 KB |
Output is correct |
65 |
Correct |
9 ms |
16476 KB |
Output is correct |
66 |
Correct |
101 ms |
26832 KB |
Output is correct |
67 |
Correct |
343 ms |
44808 KB |
Output is correct |
68 |
Correct |
356 ms |
45996 KB |
Output is correct |
69 |
Correct |
8 ms |
15780 KB |
Output is correct |
70 |
Correct |
59 ms |
26092 KB |
Output is correct |
71 |
Correct |
207 ms |
51684 KB |
Output is correct |
72 |
Correct |
255 ms |
50220 KB |
Output is correct |
73 |
Correct |
52 ms |
22884 KB |
Output is correct |
74 |
Correct |
281 ms |
44476 KB |
Output is correct |
75 |
Correct |
20 ms |
18644 KB |
Output is correct |
76 |
Correct |
217 ms |
51192 KB |
Output is correct |
77 |
Correct |
228 ms |
51348 KB |
Output is correct |
78 |
Correct |
18 ms |
18012 KB |
Output is correct |
79 |
Correct |
341 ms |
44208 KB |
Output is correct |
80 |
Correct |
4 ms |
15196 KB |
Output is correct |
81 |
Correct |
63 ms |
25484 KB |
Output is correct |
82 |
Correct |
244 ms |
48320 KB |
Output is correct |
83 |
Correct |
289 ms |
44616 KB |
Output is correct |
84 |
Correct |
281 ms |
44480 KB |
Output is correct |
85 |
Correct |
336 ms |
44528 KB |
Output is correct |
86 |
Correct |
302 ms |
48168 KB |
Output is correct |
87 |
Correct |
284 ms |
48416 KB |
Output is correct |