Submission #1315772

#	Time	Username	Problem	Language	Result	Execution time	Memory
1315772		Almonther	Jakarta Skyscrapers (APIO15_skyscraper)	C++20	100 / 100	573 ms	4172 KiB

skyscraper

#include<bits/stdc++.h>

using namespace std;

#define ll long long 
#define co cout<< 
// stuff

void solve(){
    ll n,k;
    cin>>n>>k;
    vector<ll>v[n+5];
    ll dp[n+5]={};
    for(int i=0;i<n;i++) dp[i]=1e18;
    ll st=-1,en=-1;
    for(int i=0;i<k;i++){
        ll x,y;
        cin>>x>>y;
        if(st==-1) st=x;
        else if(en==-1) en=x;
        v[x].push_back(y);
    }
    set<pair<ll,ll>>curr;
    curr.insert({0,st});
    dp[st]=0;
    while(curr.size()){
        auto [dis,i]=*curr.begin();
        curr.erase(curr.begin());
        for(auto j:v[i]){
            for(int k=1;i+j*k<n;k++){
                ll x=i+j*k;
                if(dp[x]>dp[i]+k){
                    curr.erase({dp[x],x});
                    dp[x]=dp[i]+k;
                    curr.insert({dp[x],x});
                }
            }
            for(int k=1;i-j*k>=0;k++){
                ll x=i-j*k;
                if(dp[x]>dp[i]+k){
                    curr.erase({dp[x],x});
                    dp[x]=dp[i]+k;
                    curr.insert({dp[x],x});
                }   
            }
        }
    }
    co ((dp[en]==1e18)?-1:dp[en]);
}

int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);
    int _=1;
    // cin>>_;
    while(_--) solve();
}

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