Submission #236144

#	Time	Username	Problem	Language	Result	Execution time	Memory
236144		thtsshz_bgwrswh	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	0 / 100	7 ms	2472 KiB

skyscraper

#pragma GCC optimize("Ofast")
#include<stdio.h>
#include<vector>
#include<queue>
#include<set>
#include<utility>
#include<algorithm>
using namespace std;
int pos[30005],power[30005],dis[30005];
vector<pair<int,int>> g[30005];
set<int> s[30005];
priority_queue<pair<int,int>,vector<pair<int,int>>,greater<pair<int,int>>> pq;
int main(){
	int i,j,n,m;
	scanf("%d%d",&n,&m);
	for(i=0;i<m;i++){
		scanf("%d%d",&pos[i],&power[i]);
		if(i!=1)
			s[pos[i]].insert(power[i]);
	}
	for(i=0;i<m;i++){
		for(j=pos[i]+power[i];j<n;j+=power[i]){
			if(s[j].count(power[i]))
				break;
			//printf("%d\n",j);
			g[pos[i]].emplace_back(j,(j-pos[i])/power[i]);
		}
		for(j=pos[i]-power[i];j>=0;j-=power[i]){
			if(s[j].count(power[i]))
				break;
			g[pos[i]].emplace_back(j,(pos[i]-j)/power[i]);
		}
	//	break;
	}
	/*for(i=0;i<n;i++){
		printf("%d\n",i);
		for(auto x:g[i])
			printf("%d ",x.first);
		putchar('\n');
	}*/
	for(i=0;i<n;i++)
		dis[i]=1000000000;
	dis[pos[0]]=0;
	pq.push({0,pos[0]});
	while(pq.size()){
		auto v=pq.top().second;
		pq.pop();
		for(auto x:g[v]){
			if(dis[v]+x.second<dis[x.first]){
				dis[x.first]=dis[v]+x.second;
                pq.push({dis[x.first],x.first});
			}
		} 
	}
	if(dis[pos[1]]==1000000000)
		puts("-1");
	else
		printf("%d\n",dis[pos[1]]);
} 

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:15:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
  ~~~~~^~~~~~~~~~~~~~
skyscraper.cpp:17:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&pos[i],&power[i]);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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