Submission #242773

#	Time	Username	Problem	Language	Result	Execution time	Memory
242773		michao	Race (IOI11_race)	C++14	21 / 100	3074 ms	12024 KiB

race

#include <bits/stdc++.h>
#define ll long long int
#define mp make_pair
#define pb push_back
#define ld long double
#define pii pair<int,int>
#define sz(x) (int)x.size()
#define piii pair<pii,pii>
#define precise cout<<fixed<<setprecision(10)
#define st first
#define nd second
#define ins insert
#define vi vector<int>
#define BOOST ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
using namespace std;
const int MAX=2e5+5;
const int inf=1e9+9;
vector<pii>P[MAX];
int gle[MAX];
int dist[MAX];
int ans=inf;

void brut(int u,int fa,int k)
{
	if (fa==-1)gle[u]=0,dist[u]=0;
	if (dist[u]==k)ans=min(ans,gle[u]);
	for (auto it:P[u])
	{
		if (it.st!=fa)
		{
			gle[it.st]=gle[u]+1;
			dist[it.st]=dist[u]+it.nd;
			brut(it.st,u,k);
		}
	}
}

void func(int n,int k)
{
	for (int i=1;i<=n;i++)brut(i,-1,k);
	
}

int best_path(int n,int k,int h[][2],int l[])
{
	for (int i=0;i<n-1;i++) 
	P[h[i][0]].pb(mp(h[i][1],l[i])),P[h[i][1]].pb(mp(h[i][0],l[i]));
	func(n,k);
	if (ans==inf)ans=-1;
	return ans;
}

• Subtask 1: 9 / 9
• Subtask 2: 12 / 12
• Subtask 3: 0 / 22
• Subtask 4: 0 / 57