Submission #935410

#	Time	Username	Problem	Language	Result	Execution time	Memory
935410		tamir1	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	10 / 100	1 ms	1368 KiB

skyscraper

#include<bits/stdc++.h>
#define ll long long
#define ff first
#define ss second
using namespace std;
ll n,m,i,j,dist[30005],b[30005],p[30005],x,y;
vector<pair<ll,ll>> v[30005];
bitset<30005> vis;
set<pair<ll,ll>> q;
int main(){
	cin >> n >> m;
	for(i=0;i<m;i++){
		cin >> b[i] >> p[i];
		x=b[i]+p[i];
		y=0;
		while(x<n){
			y++;
			v[b[i]].push_back({x,y});
			x+=p[i];
		}
		x=b[i]-p[i];
		y=0;
		while(x>=0){
			y++;
			v[b[i]].push_back({x,y});
			x-=p[i];
		}
	}
	q.insert({0,b[0]});
	while(!q.empty()){
		auto z=*q.begin();
		x=z.ss;
		y=z.ff;
		q.erase(q.begin());
		if(vis[x]) continue;
		dist[x]=-y;
		vis[x]=1;
		for(i=0;i<v[x].size();i++){
			if(!vis[v[x][i].ff]){
				q.insert({y-v[x][i].ss,v[x][i].ff});
			}
		}
	}
	if(vis[b[1]]) cout << dist[b[1]];
	else cout << -1;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:38:12: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |   for(i=0;i<v[x].size();i++){
      |           ~^~~~~~~~~~~~

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