Submission #953647

#	Time	Username	Problem	Language	Result	Execution time	Memory
953647		Unforgettablepl	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	264 ms	262144 KiB

skyscraper

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

#define int long long

priority_queue<pair<int,int>> q;
vector<pair<int,int>> adj[6000000];
bool visited[6000000];
int n;
const int threshold = 173;

void adddoge(int power,int building){
    if(power>threshold){
        int minimum = building - power*(building/power);
        for (int i = minimum; i < n; i += power)
            adj[building*174].emplace_back(i*174,abs(building-i)/power);
    } else {
        adj[building*174].emplace_back(building*174+power,0);
    }
}

int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int m;
    cin >> n >> m;
    int base,tar,bp,tp;
    cin>>base>>bp>>tar>>tp;
    adddoge(bp,base);
    adddoge(tp,tar);
    for(int i=2;i<m;i++){
        int b,p;cin>>b>>p;
        adddoge(p,b);
    }
    for(int i=0;i<n;i++){
        int b = i*174;
        for(int j=b+1;j<b+174;j++){
            adj[j].emplace_back(b,0);
        }
    }
    for(int power=1;power<=173;power++){
        int offset = 174*power;
        for(int i=power;i<n;i++){
            adj[i*174+power].emplace_back(i*174+power-offset,1);
        }
        for(int i=n-power-1;i>=0;i--){
            adj[i*174+power].emplace_back(i*174+power+offset,1);
        }
    }
    base*=174;tar*=174;
    q.emplace(0, base);
    while(!q.empty()){
        auto curr = q.top();q.pop();
        if(visited[curr.second])continue;
        visited[curr.second]=true;
        if(curr.second==tar){
            cout << -curr.first << '\n';
            return 0;
        }
        for(auto&i:adj[curr.second])if(!visited[i.first])q.emplace(curr.first-i.second,i.first);
    }
    cout << "-1\n";
}

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