Submission #369714

#	Time	Username	Problem	Language	Result	Execution time	Memory
369714		Bill_00	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	57 / 100	1094 ms	77292 KiB

skyscraper

#include <bits/stdc++.h>
#define ff first
#define ss second
#define mp make_pair
#define pb push_back
#define pp push
#define MOD 1000000007
#define INF 1e18
#define N 30005
#define M 5000000
typedef long long ll;
const ll c=174;

using namespace std;
ll b[N],p[N],path[N];
ll pos[N];
unordered_map<ll,bool>pp[N];
vector<pair<ll,ll> >adj[N];
bool vis[N],visited[N];
int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
 	ll n,m;
 	cin >> n >> m;
 	for(ll i=1;i<=m;++i){
 		cin >> b[i] >> p[i];
 		if(pp[b[i]][p[i]]!=0){
 			vis[i]=1;
 		}
 		else{
 			++pos[b[i]];
 			pp[b[i]][p[i]]=1;
 		}
 	}
 	if(b[1]==b[2]){
 		cout << 0;
 		return 0;
 	}
 	for(ll i=1;i<=m;++i){
 		if(vis[i]==1) continue;
 		for(ll j=b[i]+p[i];j<n;j+=p[i]){
 			if(pos[j]) adj[b[i]].pb({j,(j-b[i])/p[i]});
 			if(pp[j][p[i]]==1) break;
 		}
 		for(ll j=b[i]-p[i];j>=0;j-=p[i]){
 			if(pos[j]) adj[b[i]].pb({j,(b[i]-j)/p[i]});
 			if(pp[j][p[i]]==1) break;
 		}
 	}
 	priority_queue<pair<ll,ll> >pq;
 	pq.push({0,b[1]});
 	while(!pq.empty()){
 		ll cost=-pq.top().ff;
 		ll doge_id=pq.top().ss;
 		// cout << doge_id <<" " << cost << '\n';
 		path[doge_id]=cost;
 		pq.pop();
 		visited[doge_id]=1;
 		for(int i=0;i<adj[doge_id].size();i++){
 			if(visited[adj[doge_id][i].ff]==0) pq.push({-(cost+adj[doge_id][i].ss),adj[doge_id][i].ff});
 		}
 		while(!pq.empty() && visited[pq.top().ss]==1) pq.pop();
 	}
 	if(path[b[2]]==0){
 		cout << -1;
 	}
 	else cout << path[b[2]];
 
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:60:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |    for(int i=0;i<adj[doge_id].size();i++){
      |                ~^~~~~~~~~~~~~~~~~~~~

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