Submission #411827

#	Time	Username	Problem	Language	Result	Execution time	Memory
411827		jeqcho	Crocodile's Underground City (IOI11_crocodile)	C++17	89 / 100	2008 ms	40376 KiB

crocodile

#include "crocodile.h"
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<pair<int,int>> vpi;

#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)

#define pb push_back
#define rsz resize
#define sz(x) int(x.size())
#define all(x) begin(x), end(x)
#define fi first
#define se second

int const n=1e5+3;
bitset<n> colored;
vpi adj[n];
int to[n];
pair<int,pii>cnt[n];

int travel_plan(int N, int M, int R[][2], int L[], int K, int P[])
{
	F0R(i,N)
	{
		cnt[i].fi=0;
		cnt[i].se.fi=2e9;
		cnt[i].se.se=2e9;
	}
	vi nw;
	F0R(i,K)
	{
		colored[P[i]]=1;
		to[P[i]]=0;
		nw.pb(P[i]);
	}
	F0R(i,M)
	{
		int u=R[i][0];
		int v=R[i][1];
		adj[u].pb({v,L[i]});
		adj[v].pb({u,L[i]});
	}
	while(!colored[0])
	{
		trav(e,nw)
		{
			trav(chi,adj[e])
			{
				if(colored[chi.fi])continue;
				++cnt[chi.fi].fi;
				int cand = to[e]+chi.se;
				if(cand < cnt[chi.fi].se.fi)
				{
					cnt[chi.fi].se.se = cnt[chi.fi].se.fi;
					cnt[chi.fi].se.fi = cand;
				}
				else
				{
					cnt[chi.fi].se.se = min(cnt[chi.fi].se.se,cand);
				}
			}
		}
		nw.clear();
		int rec = 1e9;
		F0R(i,N)
		{
			if(colored[i])continue;
			if(cnt[i].fi>=2)
			{
				if(cnt[i].se.se<=rec)
				{
					if(cnt[i].se.se<rec)
					{
						nw.clear();
					}
					rec=cnt[i].se.se;
					nw.pb(i);
				}
			}
		}
		trav(e,nw)
		{
			to[e]=rec;
			colored[e]=1;
		}
	}
	return (int)to[0];
}

• Subtask 1: 46 / 46
• Subtask 2: 43 / 43
• Subtask 3: 0 / 11