#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
#include <array>
//#include <ext/pb_ds/tree_policy.hpp>
//#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
//using namespace __gnu_pbds;
#define FOR(i,start,end) for(int i=start;i<(int)(end);i++)
#define FORE(i,start,end) for(int i=start;i<=(int)end;i++)
#define RFOR(i,start,end) for(int i = start; i>end; i--)
#define RFORE(i,start,end) for(int i = start; i>=end; i--)
#define all(a) a.begin(), a.end()
#define mt make_tuple
#define mp make_pair
#define v vector
#define sf scanf
#define pf printf
#define dvar(x) cout << #x << " := " << x << "\n"
#define darr(x,n) FOR(i,0,n) cout << #x << "[" << i << "]" << " := " << x[i] << "\n"
typedef long long ll;
typedef long double ld;
typedef pair<int, int > pii;
typedef pair<ll, ll> pll;
//template <class T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<class T> void minn(T &a, T b) { a = min(a, b); }
template<class T> void maxx(T &a, T b) { a = max(a, b); }
void io() {
#ifdef LOCAL_PROJECT
freopen("input.in", "r", stdin); freopen("output.out", "w", stdout);
#else
/* online submission */
#endif
ios_base::sync_with_stdio(false); cin.tie(NULL);
}
const ll MOD = 1000000007LL;
const ll PRIME = 105943LL;
const ll INF = 1e12;
/****************************************************************/
const int MAXN = 1e6 + 1;
int N, T, M;
v<int> adj[MAXN];
bool findpath(int p, int st, int en, v<int> &pa) {
if (st == en) return true;
for (auto c : adj[st]) if (c != p) {
pa.push_back(c);
if (findpath(st, c, en, pa))
return true;
else
pa.pop_back();
}
}
pii bad;
int moves(int x, int p) {
v<int> cdp = { 0,0 };
int deg = 0;
for (auto c : adj[x]) if (c != p &&mp(c, x) != bad && mp(x, c) != bad) {
cdp.push_back(moves(c, x));
deg++;
}
sort(all(cdp), greater<int>());
return deg + cdp[1];
}
int main() {
io();
cin >> N >> T >> M;
FOR(i, 0, N - 1) {
int a, b; cin >> a >> b;
adj[a].push_back(b), adj[b].push_back(a);
}
v<int> path = { M };
findpath(-1, M, T, path);
// darr(path, path.size());
int ans = 0;
FOR(i, 0, path.size() - 1) {
bad = { (i-1<0?-1:path[i - 1]), path[i] };
ans += moves(path[i], path[i + 1]);
}
cout << ans << "\n";
}
Compilation message
mousetrap.cpp: In function 'bool findpath(int, int, int, std::vector<int>&)':
mousetrap.cpp:57:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
22 ms |
23800 KB |
Output is correct |
| 2 |
Correct |
22 ms |
23800 KB |
Output is correct |
| 3 |
Correct |
22 ms |
23800 KB |
Output is correct |
| 4 |
Correct |
22 ms |
23800 KB |
Output is correct |
| 5 |
Incorrect |
23 ms |
23800 KB |
Output isn't correct |
| 6 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
413 ms |
68628 KB |
Output is correct |
| 2 |
Correct |
371 ms |
63992 KB |
Output is correct |
| 3 |
Correct |
1018 ms |
69624 KB |
Output is correct |
| 4 |
Correct |
413 ms |
46584 KB |
Output is correct |
| 5 |
Correct |
1127 ms |
69540 KB |
Output is correct |
| 6 |
Correct |
1194 ms |
69504 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
22 ms |
23800 KB |
Output is correct |
| 2 |
Correct |
22 ms |
23800 KB |
Output is correct |
| 3 |
Correct |
22 ms |
23800 KB |
Output is correct |
| 4 |
Correct |
22 ms |
23800 KB |
Output is correct |
| 5 |
Incorrect |
23 ms |
23800 KB |
Output isn't correct |
| 6 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
22 ms |
23800 KB |
Output is correct |
| 2 |
Correct |
22 ms |
23800 KB |
Output is correct |
| 3 |
Correct |
22 ms |
23800 KB |
Output is correct |
| 4 |
Correct |
22 ms |
23800 KB |
Output is correct |
| 5 |
Incorrect |
23 ms |
23800 KB |
Output isn't correct |
| 6 |
Halted |
0 ms |
0 KB |
- |
