Submission #43934

#	Time	Username	Problem	Language	Result	Execution time	Memory
43934		Kerim	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	36 / 100	765 ms	262144 KiB

skyscraper

#include "bits/stdc++.h"
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

#define MAXN 30009
#define INF 1000000007
#define mp(x,y) make_pair(x,y)
#define all(v) v.begin(),v.end()
#define pb(x) push_back(x)
#define wr cout<<"----------------"<<endl;
#define ppb() pop_back()
#define tr(ii,c) for(__typeof((c).begin()) ii=(c).begin();ii!=(c).end();ii++)
#define ff first
#define ss second
#define my_little_dodge 46
#define debug(x)  cerr<< #x <<" = "<< x<<endl;
using namespace std;

typedef long long ll;
typedef pair<int,int> PII;
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
PII arr[MAXN];
int dis[MAXN];
vector<PII>adj[MAXN];
int s,t;
set<int>st[MAXN];
int main(){
    //~ freopen("file.in", "r", stdin);
    int n,m;
    scanf("%d%d",&n,&m);
    for(int i=1;i<=m;i++){
		int u,v;
		scanf("%d%d",&u,&v);
		if(i==1)
			s=u;
		if(i==2)
			t=u;
		arr[i]=mp(u,v);	
	}
	sort(arr+1,arr+m+1);
	for(int i=m;i>=1;i--){
		int cur=1;
		int u=arr[i].ff,v=arr[i].ss;
		for(int j=u+v;j<n;j+=v){
			adj[u].pb(mp(j,cur));	
			//~ cout<<u<<" "<<j<<" "<<cur<<endl;
			if(st[j].count(v))
				break;
			//might be break condition
			cur++;
		}
		st[u].insert(v);
	}
	for(int i=1;i<=m;i++){
		int cur=1;
		int u=arr[i].ff,v=arr[i].ss;
		for(int j=u-v;j>=0;j-=v){
			//~ cout<<u<<" "<<j<<" "<<cur<<endl;
			adj[u].pb(mp(j,cur));	
			if(st[j].count(v))
				break;
			//might be break condition
			cur++;
		}
		st[u].insert(v);
	}
	priority_queue<pair<int,int> >q;
	q.push(mp(0,s));
	for(int i=0;i<n;i++)
		dis[i]=INF;
	dis[s]=0;
	while(!q.empty()){
		int val=-q.top().ff;
		int nd=q.top().ss;
		q.pop();
		if(dis[nd]!=val)
			continue;
		tr(it,adj[nd])
			if(umin(dis[it->ff],dis[nd]+it->ss))
				q.push(mp(-dis[it->ff],it->ff));
	}
	if(dis[t]==INF)
		dis[t]=-1;
	printf("%d\n",dis[t]);
	return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:31:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&m);
     ~~~~~^~~~~~~~~~~~~~
skyscraper.cpp:34:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&u,&v);
   ~~~~~^~~~~~~~~~~~~~

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