Submission #1075080

#	Time	Username	Problem	Language	Result	Execution time	Memory
1075080		XJP12	Senior Postmen (BOI14_postmen)	C++14	100 / 100	390 ms	86864 KiB

postmen

#include<bits/stdc++.h>
using namespace std;
typedef vector<int> vi;
typedef pair<int,int> ii;
typedef vector<ii> vii;
typedef vector<vii> vvi;
bitset<1000000> mp;
vvi g;
bitset<1000000> vis;
vi indeg;
int x=-1;
void dfs(int u){
	if(vis[u]==true){
		x = u;
		cout<<u<<" ";
		vis[u]=false;
		return;
	}
	vis[u]=true;
	for(auto v: g[u]){
		vis[u]=true;
		if(mp[v.second]!=1){
			mp[v.second]=1;
			indeg[u]--;
			indeg[v.first]--;
			dfs(v.first);
			if(x!=-1 && x!=u){
			//	cout<<u<<endl;
				cout<<u<<" ";
				vis[u]=false;
				return;
			}
			if(x!=-1 && x==u){
			//vis[u]=false;
				cout<<'\n';
				x=-1;
			}
		}
	}

}
int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	int n,m;
	cin>>n>>m;
	g.resize(n+1,vii());
	indeg.resize(n+1,0);
	for(int i=0; i<m; i++){
		int a,b;
		cin>>a>>b;
		if(a>b) swap(a,b);
		mp[i] = 0;
		indeg[a]++;
		indeg[b]++;
		g[a].push_back({b,i});
		g[b].push_back({a,i});
	}
	for(int i=1; i<=n; i++){
		if(indeg[i]>0) dfs(i);
	}
}

• Subtask 1: 38 / 38
• Subtask 2: 17 / 17
• Subtask 3: 45 / 45