Submission #270653

#	Time	Username	Problem	Language	Result	Execution time	Memory
270653		test2	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	36 / 100	460 ms	262148 KiB

skyscraper

#include<bits/stdc++.h>

#define I inline void 

using ll = long long ; 
using ld = long double ; 

using namespace std ; 

const int N = 1e5 + 7 , mod = 1e9+7 ;  

// how interesting!

int n;  
int d[N] ; 
vector<pair<int , int > > adj[N] ;
bool skys[30001][30001] , ed[30001][30001]; 

int st , en ; 

I dijkstra(){

	priority_queue<pair<int , int> > qu ; 
	qu.push({0 , st}) ; 
	d[st] = 0 ; 

	while(qu.size()){
		int dst = -qu.top().first ; 
		int node = qu.top().second ; 
		qu.pop() ; 

		for(auto u : adj[node]){
			if(d[u.first] == -1 || dst + u.second < d[u.first]){

				d[u.first]  = dst + u.second ; 
				qu.push({-d[u.first] , u.first}) ;
			}
		}
	}
}


int main(){	
	ios_base::sync_with_stdio(0) ; 
	cin.tie(0) ; 
	//freopen("in.in" , "r" , stdin) ;  
	memset(d , -1 , sizeof d) ; 
	int m; 
	cin >> n >> m; 

	for(int i = 0 ;i < m;i++){
		int a , b; 
		cin >> a >> b; 
		if(i == 0) 
			st = a ;
		if(i == 1 )
			en = a; 

		if(skys[a][n+b] || skys[a][n-b])
			continue ; 
		//skys[a][b] = skys[a][-b] = 1 ; 

		int cur = a + b , j = 0 ; 
		while(cur < n ){
			if(!ed[a][cur])
				adj[a].push_back({cur , ++j}) ; 
			cur+= b;
			if(skys[cur][n+b])break ;  
		}	
		cur = a - b , j = 0 ; 
		while(cur >= 0){
			if(!ed[a][cur])
				adj[a].push_back({cur , ++j}) ; 
			cur-=b ; 
			if(cur >= 0 && skys[cur][n+b])
				break ; 
		}
	}
	dijkstra() ; 
	cout<< d[en] ; 

	return 0 ; 
}

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