Submission #288669

#	Time	Username	Problem	Language	Result	Execution time	Memory
288669		LordOfIran	Senior Postmen (BOI14_postmen)	C++17	55 / 100	860 ms	39548 KiB

postmen

//                             In The Name Of Allah                                           
#include <bits/stdc++.h>
#define	ss second
#define ff first
#define use_fast ios::sync_with_stdio(false), cin.tie(0), cout.tie(0)
#define se(n) cout << setprecision(n) << fixed
#define pb push_back
//#define ll long long
#define ld long double
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops")
#pragma GCC optimize("no-stack-protector,fast-math")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
using namespace std; 
const int N = 5e5 + 100, OO = 1e9 + 7, K = 1e7 + 4, T = 22, M = 1e9 + 7, P = 6151, SQ = 1300, lg = 22;
typedef pair <int, int> pii;
bool mark[N];
int num[N], ET[N], l[N], r[N], nw[N], ht[N], nxt = 0, lst[N], pre[N][3];
 
inline void dfs(int x) {
	while(nw[x] != -1) {
    	int p = nw[x];
    	nw[x] = pre[p][(x == r[p])];
        if(mark[p])
          continue;
    	mark[p] = true;
    	dfs(l[p] ^ r[p] ^ x);
		ET[nxt++] = x;
   }
}

int32_t main() {
	int n, m;
	cin >> n >> m;
  for(int i = 1; i <= n; i++)
    lst[i] = -1;
  for(int j = 0; j < m; j++)
    pre[j][0] = pre[j][1] = -1;
	for(int i = 0; i < m; i++) {
		cin >> l[i] >> r[i];	
		if(lst[l[i]] != -1)
			pre[lst[l[i]]][(r[lst[l[i]]] == l[i])] = i;
		if(lst[r[i]] != -1)
			pre[lst[r[i]]][(r[lst[r[i]]] == r[i])] = i;
		if(lst[l[i]] == -1)
			nw[l[i]] = i;
		if(lst[r[i]] == -1)
			nw[r[i]] = i;
		lst[l[i]] = lst[r[i]] = i;
	}
	dfs(1);
	int sz = -1;
	for(int i = 0; i < nxt; i++) {
		int u = ET[i];
		if(num[u]) {
			cout << u;
			while(ht[sz] != u) 	
				cout << " " << ht[sz], num[ht[sz]]--, sz--;
			cout << endl;
		}
		else 
			ht[++sz] = u, num[u]++;
	}
	for(int i = 0; i <= sz; i++)
		cout << ht[i] << " ";
	cout << endl;
	return 0;
}

• Subtask 1: 38 / 38
• Subtask 2: 17 / 17
• Subtask 3: 0 / 45