Submission #391275

#	Time	Username	Problem	Language	Result	Execution time	Memory
391275		Blagojce	Jakarta Skyscrapers (APIO15_skyscraper)	C++11	57 / 100	1086 ms	9808 KiB

skyscraper

#include <bits/stdc++.h>
#define fr(i, n, m) for(int i = (n); i < (m); i ++)
#define pb push_back
#define st first
#define nd second
#define pq priority_queue
#define all(x) begin(x), end(x)


using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pii;
const int i_inf = 1e9;
const ll inf = 1e18;
const ll mod = 1e9+7;
const ld eps = 1e-13;
const ld pi  = 3.14159265359;

mt19937 _rand(time(NULL));
clock_t z;

const int mxn = 4e4;

int n, m;

ll b[mxn], p[mxn];
ll dist[mxn];

vector<ll> g[mxn];
bool vis[mxn];


bool con[500][mxn];

void solve(){
	cin >> n >> m;
	fr(i, 0, m){
		cin >> b[i] >> p[i];
		g[b[i]].pb(p[i]);
		if(p[i] < 500) con[p[i]][b[i]] = true;
	}
	fr(i, 0, n) dist[i] = inf;
	
	pq <pair<ll,int> > Q;
	Q.push({0, b[0]});
	dist[b[0]] = 0;
	while(!Q.empty()){
		int c = Q.top().nd;
		ll w  = Q.top().st;
		Q.pop();
		if(c == b[1]){
			cout<<-w<<endl;
			return;
		}
		if(vis[c]) continue;
		vis[c] = true;
		for(auto u : g[c]){
			for(int i = c + u; i < n; i += u){
				if(dist[c] + (i-c)/u < dist[i]){
					dist[i] = dist[c] + (i-c)/u;
					Q.push({-dist[i], i});
				}
				if(u < 500 && con[u][i]) break;
				
			}
			for(int i = c - u; i >=0; i -= u){
				if(dist[c] + (c-i)/u < dist[i]){
					dist[i] = dist[c] + (c-i)/u;
					Q.push({-dist[i], i});
				}
				if(u < 500 && con[u][i]) break;
			}
		}
	}
	cout<<-1<<endl;
	
}

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	solve();
}

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