Submission #243589

#	Time	Username	Problem	Language	Result	Execution time	Memory
243589		michao	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	100 / 100	240 ms	126676 KiB

skyscraper

//              _      _                 
//             (_)    | |                
//    _ __ ___  _  ___| |__   __ _  ___  
//   | '_ ` _ \| |/ __| '_ \ / _` |/ _ \ 
//   | | | | | | | (__| | | | (_| | (_) |
//   |_| |_| |_|_|\___|_| |_|\__,_|\___/ 
//                                       
// 
#include <bits/stdc++.h>
#define int long long
#define mp make_pair
#define pb push_back
#define ld long double
#define pii pair<int,int>
#define sz(x) (int)x.size()
#define piii pair<pii,pii>
#define precise cout<<fixed<<setprecision(10)
#define st first
#define nd second
#define ins insert
#define vi vector<int>
#define BOOST ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
using namespace std;
const int MAX=30005;
const int inf=INT_MAX;
set<int>pos[MAX];
pii tab[MAX];
vector<pii>P[MAX];
int dp[MAX];
priority_queue<pii>q;
int32_t main()
{
  BOOST;
  int n,m;
  cin>>m>>n;
  for (int i=1;i<=n;i++)cin>>tab[i].st>>tab[i].nd,pos[tab[i].st].ins(tab[i].nd);
  
  for (int i=0;i<m;i++)
  {
  	for (auto it:pos[i])
  	{
  		for (int j=i+it;j<m;j+=it)
  		{
  			P[i].pb(mp(j,(j-i)/it));
  			if (pos[j].count(it))break;
  		}
  		
  		for (int j=i-it;j>=0;j-=it)
  		{
  			P[i].pb(mp(j,(i-j)/it));
  			if (pos[j].count(it))break;
  		}
  	}
  }
  	
  	for (int i=0;i<m;i++)dp[i]=inf;
  	dp[tab[1].st]=0;
  	q.push(mp(0,tab[1].st));
  	while (!q.empty())
  	{
  		pii akt=q.top();
  		q.pop();
  		akt.st=-akt.st;
  		if (dp[akt.nd]!=akt.st)continue;
  		for (auto it:P[akt.nd])
			{
  			if (akt.st+it.nd<dp[it.st])
  			{
  				dp[it.st]=akt.st+it.nd;
  				q.push(mp(-dp[it.st],it.st));
  			}
  		}
  	}
  if (dp[tab[2].st]==inf)dp[tab[2].st]=-1;
  cout<<dp[tab[2].st];
  return 0;
}

Compilation message (stderr)

skyscraper.cpp:4:1: warning: multi-line comment [-Wcomment]
 //   | '_ ` _ \| |/ __| '_ \ / _` |/ _ \ 
 ^
skyscraper.cpp:24:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization ("O3")
 
skyscraper.cpp:25:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization ("unroll-loops")

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