Submission #666558

#	Time	Username	Problem	Language	Result	Execution time	Memory
666558		Kaztaev_Alisher	Hard route (IZhO17_road)	C++17	19 / 100	2024 ms	724 KiB

road

//#pragma GCC optomize ("Ofast")
//#pragma GCC optomize ("unroll-loops")
//#pragma GCC target ("avx,avx2,fma")
 
#include <bits/stdc++.h>
#define F first
#define S second
#define pb push_back
#define sz size
#define cl clear
#define ins insert
#define ers erase
#define pii pair < int , int >
#define pll pair< long long  , long long >
#define all(x) x.begin() , x.end()
#define ios ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
#define tostr(x) to_string(x)
#define tonum(s) atoi(s.c_str())
#define seon(x) setprecision(x)
#define bpop(x) __builtin_popcount(x)
#define deb(x) cerr << #x  << " = " << x << endl;
 
typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef long double ldb;
const double PI = 3.14159265;
 
const ll N = 5e3+5;
const ll mod = 1e9+7;
const ll inf = 1e9;
const ll INF = 1e18;
 
using namespace std;
 
int n , ok = 0 , cnt1 = 0 , cnt = 0 , kal = 0;
vector<int> g[N] , vec;
bool was[N];
void dfs(int v , int fn , int p){
	was[v] = 1;
	cnt++;
	if(v == fn){
		cnt1 = cnt;
		ok = 1;
		return;
	}
	for(int to : g[v]){
		if(to==p) continue;
		dfs(to , fn , v);
		if(ok == 1) return;
	}
	if(ok == 1) return;
	cnt--;
	was[v] = 0;
}
void get(int v ,int p){
	if(was[v] == 1){
		ok = 1;
		return;
	}
	kal++;
	for(int to : g[v]){
		if(to == p) continue;
		get(to,v);
		if(ok == 1) return;
	}
	kal--;
}
void solve(){
	cin >> n;
	for(int i = 1; i < n; i++){
		int a , b;
		cin >> a >> b;
		g[a].pb(b);
		g[b].pb(a);
	}
	for(int i = 1; i <= n; i++){
		if(g[i].sz() == 1) vec.pb(i);
	}
	int ans = 0 , ans2 = 0;
	for(int i = 0; i < vec.sz(); i++){		
		for(int j = i+1; j < vec.sz(); j++){
			int mx = 0;
			ok = 0;
			cnt = 0;
			cnt1 = 0;
			dfs(vec[i] , vec[j] , 0);
			for(int k = 0; k < vec.sz(); k++){
				if(i != k && j != k){
					kal = 0;
					ok = 0;
					get(vec[k] , 0);
					mx = max(mx , kal);
				}
			}
			for(int k = 1; k <= n; k++) was[k] = 0;
			cnt1--;
			if(cnt1*mx > ans){
				ans = cnt1*mx;
				ans2 = 1;
			} else if(cnt1*mx == ans) ans2++;
		}
	}	
	cout << ans <<" " << ans2 <<"\n";
}
signed main(){
	file("road");
	ios;
	solve();
	return 0;
}
/*
*/ 

Compilation message (stderr)

road.cpp: In function 'void solve()':
road.cpp:82:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   82 |  for(int i = 0; i < vec.sz(); i++){
      |                 ~~^~~~~~~~~~
road.cpp:83:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   83 |   for(int j = i+1; j < vec.sz(); j++){
      |                    ~~^~~~~~~~~~
road.cpp:89:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   89 |    for(int k = 0; k < vec.sz(); k++){
      |                   ~~^~~~~~~~~~
road.cpp: In function 'int main()':
road.cpp:17:48: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 | #define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
      |                                         ~~~~~~~^~~~~~~~~~~~~~~~~~~~
road.cpp:108:2: note: in expansion of macro 'file'
  108 |  file("road");
      |  ^~~~
road.cpp:17:77: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 | #define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
      |                                                                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
road.cpp:108:2: note: in expansion of macro 'file'
  108 |  file("road");
      |  ^~~~

• Subtask 1: 19 / 19
• Subtask 2: 0 / 33
• Subtask 3: 0 / 48