Submission #745371

#	Time	Username	Problem	Language	Result	Execution time	Memory
745371		Markomafko972	Senior Postmen (BOI14_postmen)	C++14	100 / 100	379 ms	73004 KiB

postmen

#include <bits/stdc++.h>
#define X first
#define Y second
#define pb push_back
#define pii pair<int, int>
typedef long long ll;
using namespace std;

const int MOD = 1e9 + 7;
const ll INF = 1e18;
const int OFF = (1 << 20);

int n, m, a, b;
vector<pii> s[500005];
vector<int> v;
vector<int> ost;
int bio[500005];
vector<int> rj[500005];
int sol = 0;

void dfs(int x) {
	while (s[x].size() > 0) {
		while (s[x].size() > 0 && s[x].back().Y == -1) s[x].pop_back();
		if (s[x].size() == 0) break;
		pii sus = s[x].back();
		s[sus.X][sus.Y].Y = -1;
		s[x].pop_back();
		dfs(sus.X);
	}
	v.push_back(x);
}

int main () {

	ios_base::sync_with_stdio(false);
	cin.tie(0);
	
	cin >> n >> m;
	for (int i = 0; i < m; i++) {
		cin >> a >> b;
		s[a].push_back({b, (int)s[b].size()});
		s[b].push_back({a, (int)s[a].size()-1});
	}
	dfs(1);
	reverse(v.begin(), v.end());

	int kol = 0;
	for (int i = 0; i < v.size(); i++) {
		if (bio[v[i]]) {
			rj[sol].push_back(v[i]);
			while (ost.back() != v[i]) {
				rj[sol].push_back(ost.back());
				bio[ost.back()]--;
				ost.pop_back();
			}
			kol += rj[sol].size();
			sol++;
		}
		else {
			bio[v[i]] = 1;
			ost.push_back(v[i]);
		}
	}
	
	if (kol != m) assert(0);
	for (int i = 0; i < sol; i++) {
		for (int j = 0; j < rj[i].size(); j++) cout << rj[i][j] << " ";
		cout << "\n";
	}

	return 0;
}

Compilation message (stderr)

postmen.cpp: In function 'int main()':
postmen.cpp:48:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |  for (int i = 0; i < v.size(); i++) {
      |                  ~~^~~~~~~~~~
postmen.cpp:67:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   67 |   for (int j = 0; j < rj[i].size(); j++) cout << rj[i][j] << " ";
      |                   ~~^~~~~~~~~~~~~~

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