Submission #438065

#	Time	Username	Problem	Language	Result	Execution time	Memory
438065		adamjinwei	Crocodile's Underground City (IOI11_crocodile)	C++14	100 / 100	959 ms	69688 KiB

crocodile

#include <bits/stdc++.h>
#include "crocodile.h"
#define inf 1000000007
#define mod 1000000007
#define rnd() rand_num()
#define bigrnd() dis(rand_num)
//#pragma GCC optimize("Ofast","inline","-ffast-math")
//#pragma GCC target("avx,sse2,sse3,sse4,mmx")
#define int long long
using namespace std;
unsigned sed=std::chrono::system_clock::now().time_since_epoch().count();
mt19937 rand_num(sed);
uniform_int_distribution<long long> dis(0,inf);
template <typename T> void read(T &x){
	x=0;char ch=getchar();int fh=1;
	while (ch<'0'||ch>'9'){if (ch=='-')fh=-1;ch=getchar();}
	while (ch>='0'&&ch<='9')x=x*10+ch-'0',ch=getchar();
	x*=fh;
}
template <typename T> void write(T x) {
	if (x<0) x=-x,putchar('-');
	if (x>9) write(x/10);
	putchar(x%10+'0');
}
template <typename T> void writeln(T x) {
	write(x);
	puts("");
}
int n;
int h[100005],e[2000005],w[2000005],ne[2000005],idx;
int dist[100005][2];
bool vis[100005];
void add(int a,int b,int c)
{
	e[idx]=b,w[idx]=c,ne[idx]=h[a],h[a]=idx++;
}
signed travel_plan(signed N,signed M,signed R[][2],signed L[],signed K,signed P[])
{
	n=N;
	memset(h,-1,sizeof(h));
	for(int i=0;i<M;++i)
	{
		add(R[i][0],R[i][1],L[i]);
		add(R[i][1],R[i][0],L[i]);
	}
	memset(dist,0x3f,sizeof(dist));
	priority_queue<pair<int,int>,vector<pair<int,int>>,greater<pair<int,int>>> pq;
	for(int i=0;i<K;++i)
	{
		dist[P[i]][0]=dist[P[i]][1]=0;
		pq.push(make_pair(0,P[i]));
	}
	while(!pq.empty())
	{
		pair<int,int> p=pq.top();
		pq.pop();
		if(vis[p.second]) continue;
		vis[p.second]=1;
		if(dist[p.second][1]!=p.first) continue;
		for(int i=h[p.second];~i;i=ne[i])
		{
			int j=e[i];
			if(vis[j]) continue;
			if(dist[j][0]>p.first+w[i])
			{
				dist[j][1]=dist[j][0];
				dist[j][0]=p.first+w[i];
				pq.push(make_pair(dist[j][1],j));
			}
			else if(dist[j][1]>p.first+w[i])
			{
				dist[j][1]=p.first+w[i];
				pq.push(make_pair(dist[j][1],j));
			}
		}
	}
	return dist[0][1];
}

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