Submission #533612

#	Time	Username	Problem	Language	Result	Execution time	Memory
533612		victor_gao	Railway Trip 2 (JOI22_ho_t4)	C++17	0 / 100	2069 ms	524292 KiB

Main

//#pragma GCC optimize("Ofast,unroll-loops,O3")
//#pragma GCC target("avx,avx2,sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,fma,tune=native")
#include<bits/stdc++.h>
//#include<bits/extc++.h>
//#pragma pack(1)
#define fast ios::sync_with_stdio(0); cin.tie(0);
#define int long long
#define pii pair<int,int>
#define x first
#define y second
#define N 100015
using namespace std;
//using namespace __gnu_pbds;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
//typedef tree<int, null_type,less_equal<int>, rb_tree_tag,tree_order_statistics_node_update> order_multiset;
//typedef tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update> order_set;
int n,k,m;
int vis1[N],vis2[N];
vector<pair<int,pii> >g[N];
void bfs(int a,int b){
	for (int i=0;i<=n;i++){
		vis1[i]=0;
//		vis2[i]=0;
	} 
	vis1[a]=1;
	queue<int>q;
	q.push(a);
	while (!q.empty()){
		int np=q.front(); q.pop();
		for (auto i:g[np]){
			for (int j=i.y.x;j<=i.y.y;j++){
				if (!vis1[j]){
					vis1[j]=vis1[np]+1;
					q.push(j);
			//		cout<<np<<" -> "<<j<<" "<<vis1[j]<<" "<<vis1[np]<<'\n';
				}
			}
		}
	}
	if (!vis1[b]) cout<<-1<<'\n';
	else cout<<vis1[b]-1<<'\n';
}
signed main(){
	fast
	cin>>n>>k>>m;
	for (int i=1;i<=m;i++){
		int a,b; cin>>a>>b;
		if (a>b){
			for (int j=a;j>=a-k+1;j--){
				g[j].push_back({i,{b,j-1}});
			}
		}
		else {
			for (int j=a;j<=a+k-1;j++){
				g[j].push_back({i,{j+1,b}});
			}
		}
	}
	int q; cin>>q;
	while (q--){
		int a,b; cin>>a>>b;
		bfs(a,b);
	}
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 8
• Subtask 3: 0 / 11
• Subtask 4: 0 / 25
• Subtask 5: 0 / 35
• Subtask 6: 0 / 13