Submission #44542

#	Time	Username	Problem	Language	Result	Execution time	Memory
44542		zetapi	Sightseeing (NOI14_sightseeing)	C++14	15 / 25	3554 ms	206152 KiB

sightseeing

/*
     Contest  :
     Task    :
*/
 
#include <bits/stdc++.h>
using namespace std;
 
#define pb  push_back
#define mp  make_pair
#define ll  long long
#define F   first
#define S   second
#define itr ::iterator 
 
typedef pair<int,int> pii;
 
const int MAX=6e5+99;
 
set<pii> vec[MAX];
 
int V,E,Q,X,Y,Z,res[MAX];
 
void dijkstra()
{
	int tem;
	pii cur;
	set<pii> pq;
	set<pii> ::iterator it;
	pq.insert(mp(MAX,1));
	res[1]=MAX;
	while(! pq.empty())
	{
		cur=*pq.rbegin();
		it=pq.end();
		it--;
		pq.erase(it);
		for(auto A:vec[cur.second])
		{
			tem=min(cur.first,A.second);
			if(tem>res[A.first])
			{
				if(res[A.first])
				pq.erase(pq.find(mp(res[A.first],A.first)));
				res[A.first]=tem;
				pq.insert(mp(res[A.first],A.first));
			}
		}
		for(auto A:vec[cur.second])
		vec[A.first].erase(vec[A.first].find(mp(cur.second,A.second)));
		vec[cur.second].clear();
	}
	return ;
}
 
signed main()
{
	//ios_base::sync_with_stdio(false);
	/*cin.tie(0);
	cout.tie(0);*/
	
	//cin>>V>>E>>Q;
	scanf("%d %d %d",&V,&E,&Q);
	while(E--)
	{
		scanf("%d %d %d",&X,&Y,&Z);
		vec[X].insert(mp(Y,Z));
		vec[Y].insert(mp(X,Z));
	}
	dijkstra();
	while(Q--)
	{
		scanf("%d",&X);
		printf("%d\n",res[X]);
	}
    return 0;
}

Compilation message (stderr)

sightseeing.cpp: In function 'int main()':
sightseeing.cpp:63:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d",&V,&E,&Q);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~
sightseeing.cpp:66:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d %d",&X,&Y,&Z);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~
sightseeing.cpp:73:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&X);
   ~~~~~^~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 5 / 5
• Subtask 3: 6 / 6
• Subtask 4: 0 / 10