Submission #1275842

#	Time	Username	Problem	Language	Result	Execution time	Memory
1275842		random_user27	Jakarta Skyscrapers (APIO15_skyscraper)	C++20	100 / 100	601 ms	3508 KiB

skyscraper

// In The Name Of God

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

typedef long long ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

#define pb push_back
#define endl '\n'
#define test(x) cout<<x,exit(0)
#define fast (ios_base::sync_with_stdio(false),cin.tie(NULL))

const int maxn=3e4+10;
const int inf=1e9;
const int sq=250;
int mark[maxn][sq+5];
int dis[maxn];
vector<int>vec[maxn];
int n,m;

int main(){
	fast;
	cin>>n>>m;	
	int start,en;
	for(int i=1;i<=m;i++){
		int b,p;cin>>b>>p;
		if(i==1){
			start=b;
		}
		if(i==2){
			en=b;
		}
		vec[b].pb(p);
	}
	for(int i=0;i<n;i++){
		dis[i]=inf;
	}
	dis[start]=0;
	priority_queue<pii, vector<pii>, greater<pii>> st;
	st.push({0,start});
	while(st.size()){
		int d=st.top().first;
		int v=st.top().second;
		st.pop();
		if(dis[v]<d){
			continue;
		}
		for(int ind=0;ind<vec[v].size();ind++){
			int p=vec[v][ind];
			int cnt=1;
			for(int i=v+p;i<n;i+=p){
				if(dis[i]>dis[v]+cnt){
					dis[i]=dis[v]+cnt;
					st.push({dis[i],i});
				}
				cnt++;
			}
			cnt=1;
			for(int i=v-p;i>=0;i-=p){
				if(dis[i]>dis[v]+cnt){
					dis[i]=dis[v]+cnt;
					st.push({dis[i],i});
				}
				cnt++;
			}
		}
	}
	if(dis[en]>1e7){
		cout<<-1<<endl;
	}
	else{
		cout<<dis[en]<<endl;
	}
}

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