Submission #82397

#	Time	Username	Problem	Language	Result	Execution time	Memory
82397		farukkastamonuda	Sightseeing (NOI14_sightseeing)	C++14	15 / 25	452 ms	34700 KiB

sightseeing

#include <bits/stdc++.h>
#define fi first
#define se second
#define lo long long 
#define inf 1000000009
#define md 1000000007
#define li 500005
#define mp make_pair
#define pb push_back
#define mid (start+end)/2
using namespace std;
int n,m,q,x,y,z,d[li],fa[li];
pair<int, pair<int,int> > p[li];
vector<int> par[li];
void unite(int val,int a,int b){
	a=fa[a],b=fa[b];
	if(a==b) return ;
	if(fa[1]==a){
		for(int i=0;i<(int)par[b].size();i++) d[par[b][i]]=val;
	}
	else if(fa[1]==b){
		for(int i=0;i<(int)par[a].size();i++) d[par[a][i]]=val;
	}
	if((int)par[a].size()<(int)par[b].size()) swap(a,b);
	for(int i=0;i<(int)par[b].size();i++){
		int go=par[b][i];
		fa[go]=a;
		par[a].pb(go);
	}
	par[b].clear();
}
int main(){
	scanf("%d %d %d",&n,&m,&q);
	for(int i=1;i<=n;i++){
		fa[i]=i;
		par[i].pb(i);
	}
	for(int i=1;i<=m;i++){
		scanf("%d %d %d",&x,&y,&z);
		p[i]=mp(z,mp(x,y));
	}
	sort(p+1,p+m+1);
	reverse(p+1,p+m+1);
	for(int i=1;i<=m;i++){
		unite(p[i].fi,p[i].se.fi,p[i].se.se);
	}
	for(int i=1;i<=q;i++){
		scanf("%d",&x);
		printf("%d\n",d[x]);
	}
	return 0;
}

Compilation message (stderr)

sightseeing.cpp: In function 'int main()':
sightseeing.cpp:33:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d",&n,&m,&q);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~
sightseeing.cpp:39:8: 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:48:8: 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