Submission #826221

#	Time	Username	Problem	Language	Result	Execution time	Memory
826221		Juan	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	1067 ms	4428 KiB

skyscraper

    #include<bits/stdc++.h>
    using namespace std;
    #pragma GCC optimize (03)
    #define int long long
    #define pb push_back
    #define pii pair<int,int>
    #define ff first
    #define ss second
    #define all(x) x.begin(),x.end()
    const int maxn = 3e4 + 5, INF = 0x3f3f3f3f;
     
    vector<int> doges[maxn];
    int dist[maxn];
    priority_queue<pii, vector<pii>, greater<pii>> pq;
     
    int32_t main(){
    	ios::sync_with_stdio(false); cin.tie(0);
    	int n, m; cin >> n >> m;
    	pii doge0, doge1; cin >> doge0.ff >> doge0.ss >> doge1.ff >> doge1.ss;
    	doges[doge0.ff].pb(doge0.ss);
    	doges[doge1.ff].pb(doge1.ss);
    	for(int i = 2; i < m; i++){
    		int bi, pi; cin >> bi >> pi;
    		doges[bi].pb(pi);
    	}
    	for(int i = 0; i < n; i++){
    		sort(all(doges[i]));
    		doges[i].erase(unique(all(doges[i])), doges[i].end());
    		// cout << doges[i].size() << endl;
    	}
     
    	for(int i = 0; i < n; i++) dist[i] = INF;
    	pq.push({0,doge0.ff});
    	dist[doge0.ff] = 0;
    	while(pq.size()){
    		auto[d,u] = pq.top(); pq.pop();
    		if(dist[u]<d) continue;
    		// cout << u << ": " << dist[u] << endl;
    		if(u==doge1.ff) continue;
     
    		for(int x : doges[u]){
    			for(int i = u+x; i < n; i+=x){
    				int wv = (i-u)/x;
    				if(dist[i] > dist[u]+wv)
    					dist[i] = dist[u]+wv, pq.push({dist[i], i});
    			}
    			for(int i = u-x; i >= 0; i-=x){
    				int wv = (u-i)/x;
    				if(dist[i] > dist[u]+wv)
    					dist[i] = dist[u]+wv, pq.push({dist[i], i});
    			}
    		}
    	}
     
    	if(dist[doge1.ff] == INF) cout << -1;
    	else cout << dist[doge1.ff];
    	cout << '\n';
    }

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