Submission #208809

#	Time	Username	Problem	Language	Result	Execution time	Memory
208809		YJU	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	100 / 100	657 ms	72504 KiB

skyscraper

#include<bits/stdc++.h>
using namespace std;
typedef int ll;
typedef pair<ll,ll> pll;
typedef long double ld;
const ll MOD=1e9+7;
const ll N=3e4+5;
const ll INF=(1LL<<30);
const ld pi=3.14159265359;
#define REP(i,n) for(ll i=0;i<n;i++)
#define REP1(i,n) for(ll i=1;i<=n;i++)
#define pb push_back
#define mp make_pair
#define X first
#define Y second
#define SZ(a) (ll)a.size()
 
 
ll n,m,b[N],p[N],x,y,dis[N];
vector<ll> P[N],tmp;
vector<pll> v[N];
priority_queue<pll,vector<pll>,greater<pll> > pq;
 
int main(){
	scanf("%d%d",&n,&m);
	REP(i,m){
		scanf("%d%d",&b[i],&p[i]);
		P[p[i]].pb(b[i]);
	}
	for(ll step=1;step<N;++step){
		if(!SZ(P[step]))continue;
		vector<vector<ll> > lis;
		lis.clear();lis.resize(step);
		tmp.clear();
		sort(P[step].begin(),P[step].end());
		for(auto i:P[step]){
			lis[i%step].pb(i);
			tmp.pb(i%step);
		}
		sort(tmp.begin(),tmp.end());
		tmp.resize(unique(tmp.begin(),tmp.end())-tmp.begin());
		for(ll i:tmp){
			//sort(lis[i].begin(),lis[i].end());
			for(ll j=1;j<SZ(lis[i]);++j){
				x=lis[i][j-1],y=lis[i][j];
				for(ll ii=x;ii<=y;ii+=step){
					if(ii!=x)v[x].pb(mp(ii,(ii-x)/step));
					if(ii!=y)v[y].pb(mp(ii,(y-ii)/step));
				}
			}
			for(ll ii=lis[i].back()+step;ii<N;ii+=step)x=lis[i].back(),v[x].pb(mp(ii,(ii-x)/step));
			for(ll ii=lis[i][0]-step;ii>=0;ii-=step)x=lis[i][0],v[x].pb(mp(ii,(x-ii)/step));
		}
	}
	REP(i,N)dis[i]=INF;
	pq.push(mp(dis[b[0]]=0,b[0]));
	while(SZ(pq)){
		x=pq.top().Y;y=pq.top().X;pq.pop();
		if(dis[x]<y)continue;
		for(pll j:v[x])if(dis[j.X]>dis[x]+j.Y)pq.push(mp(dis[j.X]=dis[x]+j.Y,j.X));
	}
	cout<<(dis[b[1]]==INF?-1:dis[b[1]])<<"\n";
	return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:25:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
  ~~~~~^~~~~~~~~~~~~~
skyscraper.cpp:27:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&b[i],&p[i]);
   ~~~~~^~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 14 / 14
• Subtask 4: 21 / 21
• Subtask 5: 43 / 43