Submission #227178

#	Time	Username	Problem	Language	Result	Execution time	Memory
227178		tushar_2658	Senior Postmen (BOI14_postmen)	C++14	55 / 100	586 ms	94328 KiB

postmen

#include "bits/stdc++.h"
using namespace std;

const int maxn = 500005;
multiset<int> edges[maxn];
vector<int> path;

void dfs(int x){
	while(!edges[x].empty()){
		int i = *edges[x].begin();
		edges[x].erase(edges[x].find(i));
		edges[i].erase(edges[i].find(x));
		dfs(i);
	}
	path.push_back(x);
}

int main(int argc, char const *argv[])
{
//	freopen("in.txt", "r", stdin); 
	int n, m;
	scanf("%d %d", &n, &m); 
	for(int i = 0; i < m; ++i){
		int x, y;
		scanf("%d %d", &x, &y); 
		edges[x].insert(y); 
		edges[y].insert(x);
	}
	dfs(1);
	path.pop_back();
	vector<vector<int>> ans;
	vector<bool> vis(n + 1, 0);
	stack<int> st;
	vector<int> v;
	for(auto i : path){
		if(vis[i]){
			v.clear();
			while(st.top() != i){
				v.push_back(st.top());
				vis[st.top()] = 0;
				st.pop();
			}
			if(st.top() == i){
				vis[st.top()] = 0;
				v.push_back(st.top());
				st.pop();
			}
			ans.push_back(v);
		}
		vis[i] = 1;
		st.push(i);
	}
	v.clear();
	while(!st.empty()){
		v.push_back(st.top());
		st.pop();
	}
	ans.push_back(v);
	for(auto i : ans){
		for(auto j : i){
			printf("%d ", j);
		}
		printf("\n");
	}

	return 0;
}

Compilation message (stderr)

postmen.cpp: In function 'int main(int, const char**)':
postmen.cpp:22:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &m); 
  ~~~~~^~~~~~~~~~~~~~~~~
postmen.cpp:25:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &x, &y); 
   ~~~~~^~~~~~~~~~~~~~~~~

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