Submission #946353

#	Time	Username	Problem	Language	Result	Execution time	Memory
946353		thunopro	Paths (RMI21_paths)	C++14	12 / 100	57 ms	17016 KiB

Main

#include<bits/stdc++.h>
using namespace std ; 
#define maxn 200009 
#define ll long long 
#define fi first 
#define se second 
#define pb push_back 
#define left id<<1
#define right id<<1|1 
#define re exit(0); 
#define _lower(x) lower_bound(v.begin(),v.end(),x)-v.begin()
#define TIME 1.0*clock()/CLOCKS_PER_SEC

const int mod = 1e9+7; 
const int INF = 1e9; 

typedef vector<int> vi; 
typedef pair<int,int> pii;
typedef vector<pii> vii;  
typedef vector<ll> vl;

void add ( int &a , int b ) 
{
	a += b ; 
	if ( a > mod ) a -= mod ; 
	if ( a < 0 ) a += mod ; 
}

template <typename T> void chkmin ( T &a , T b ) { if ( a > b ) a = b ; }
template <typename T> void chkmax ( T &a , T b ) { if ( a < b ) a = b ; }

int _pow ( int a , int n ) 
{
	if ( n == 0 ) return 1 ;
	int res = _pow (a,n/2) ; 
	if ( n % 2 ) return 1ll*res*res%mod*a%mod ; 
	else return 1ll*res*res%mod ; 
}

void rf () 
{
	freopen ("bai1.inp","r",stdin) ;
}

int n , k ; 
vii adjList [maxn] ; 

ll d1 [maxn] , d2 [maxn] , d [maxn] ; 
int pos ; ll best = 0 ; 

void bfs ( int u ) 
{
	memset ( d , 0x3f , sizeof d ) ; 
	queue <int> q ;
	d [u] = 0 ;  
	q . push (u) ; 
	while ( !q.empty() ) 
	{
		int u = q.front() ; q.pop() ; 
		for ( auto x : adjList [u] ) 
		{
			int v = x.fi , w = x.se ; 
			if ( d [v] > d [u] + w ) q . push (v) , d [v] = d [u] + w ; 
		}
	}
	best = -1 ;
	for ( int i = 1 ; i <= n ; i ++ ) if ( d [i] > best ) best = d [i] , pos = i ; 	
}

int main () 
{
	ios_base::sync_with_stdio(0); 
	cin.tie(0);cout.tie(0);
//	rf () ; 
	cin >> n >> k ; 
	for ( int i = 1 ; i < n ; i ++ ) 
	{
		int u , v , w ; cin >> u >> v >> w ; 
		adjList [u] . pb ({v,w}) ; 
		adjList [v] . pb ({u,w}) ; 
	}
	
	bfs (1) ; 
	bfs (pos) ; 
	for ( int i = 1 ; i <= n ; i ++ ) d1 [i] = d [i] ; 
	bfs (pos) ; 
	for ( int i = 1 ; i <= n ; i ++ ) d2 [i] = d [i] ; 
	
	for ( int i = 1 ; i <= n ; i ++ ) cout << max (d1[i],d2[i]) << "\n" ; 
}

Compilation message (stderr)

Main.cpp: In function 'void rf()':
Main.cpp:42:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |  freopen ("bai1.inp","r",stdin) ;
      |  ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 11
• Subtask 3: 0 / 17
• Subtask 4: 0 / 20
• Subtask 5: 12 / 12
• Subtask 6: 0 / 32