Submission #207787

#	Time	Username	Problem	Language	Result	Execution time	Memory
207787		mohamedsobhi777	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	10 / 100	7 ms	2684 KiB

skyscraper

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

const int N = 3e5 + 7 ; 

int n  , m ;

int b[N] , bn[N] , p[N] , d[N]; 

int dijkstra() 
{
    memset(d , -1 , sizeof d) ; 
    priority_queue<pair<int , int > > q ; 
    q.push({0 , b[0]}) ;
    d[ b[0] ] = 0;
    while(q.size())
    {
        int place = q .top().second ; 
        int node = bn[place] ; 
        int dist = -q.top().first ; 
        q.pop();    
        if(node==-1)
        continue;
        if(dist != d[place]) continue ; 
        int j = 1; 
        if(!p[node]) continue;
        for(int i = place + p[node] ; i < n ; i+=p[node] , j++)
        {
            if(d[i]==-1 || dist + j < d[i])
            {
                d[i] = dist + j ; 
                q.push({-d[i] , i}) ; 
            }
        }
        j = 1 ; 
        for(int i = place - p[node] ; i >= 0 ; i-=p[node] , j++)
        {
            if(d[i]==-1 || dist + j < d[i])
            {
                d[i] = dist + j ; 
                q.push({-d[i] , i}) ; 
            }
        }
    }
    return d[ b[1] ] ; 
}

int main() 
{
  
   // freopen("in.in" , "r",  stdin) ; 
    cin>>n>>m ; 
    memset(bn , -1 , sizeof bn) ; 
    for(int i= 0 ; i <  m ; i++)
    {
        int A , B;  
        cin>>A>>B ; 
        b[ i ] = A;
        bn[A] = i ; 
        p[i] = B ; 
    }
    cout<<dijkstra();
    return 0 ;  
}

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