Submission #938951

#	Time	Username	Problem	Language	Result	Execution time	Memory
938951		Xiaoyang	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	0 / 100	1 ms	1500 KiB

skyscraper

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

typedef long long ll;

#define fi first 
#define se second 
#define pll pair<ll,ll>
#define pb push_back
#define debug(x) cerr<<#x<<"="<<x<<endl;
#define MP make_pair
#define rep(i,a,b) for(ll i=a;i<b;i++)
#define ALL(x) x.begin(),x.end()
#define endl "\n"
const ll inf=1e18;


const ll maxn=33333;
vector<pll>alist[maxn];
ll b[maxn],p[maxn];
ll dist[maxn];
priority_queue<pll,vector<pll>,greater<pll>>s;


int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	ll n,m;cin>>n>>m;
	rep(i,0,m){
		cin>>b[i]>>p[i];
		ll hop=0;
		for(ll j=b[i]-p[i];j>=0;j-=p[i])alist[b[i]].pb(MP(++hop,j));
		hop=0;
		for(ll j=b[i]+p[i];j<n;j+=p[i])alist[b[i]].pb(MP(++hop,j));
	}
	rep(i,0,maxn)dist[i]=inf;
	dist[0]=0;
	s.push(MP(0,0));
	while(!s.empty()){
		auto u=s.top();
		s.pop();
		if(u.fi!=dist[u.se])continue;
		for(auto x:alist[u.se]){
			if(dist[u.se]+x.fi<dist[x.se]){
				dist[x.se]=dist[u.se]+x.fi;
				s.push(MP(dist[x.se],x.se));
			}
		}
	}
	if(dist[1]==inf)cout<<-1<<endl;
	else cout<<dist[1]<<endl;
	return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 12
• Subtask 3: 0 / 14
• Subtask 4: 0 / 21
• Subtask 5: 0 / 43