Submission #31525

#	Time	Username	Problem	Language	Result	Execution time	Memory
31525		minkank	Senior Postmen (BOI14_postmen)	C++11	55 / 100	631 ms	115340 KiB

postmen

#include <iostream>
#include <set>
#include <stack>
using namespace std;
 
const int N = 5e5 + 5;
int n, m, check[N];
set<int> s[N];
stack<int> st;
 
void dfs(int u) {
	while(s[u].size()) {
		int v = *s[u].begin();
		s[u].erase(v); s[v].erase(u);
		dfs(v);
	}
	if(check[u]) {
		while(st.top() != u) cout << st.top() << ' ', check[st.top()] = false, st.pop(); st.pop();
		cout << u << '\n';		
	}
	check[u] = 1; st.push(u);
}
 
int main() {
	scanf("%d %d", &n, &m);
	for(int i = 1; i <= m; ++i) {
		int u, v;
		scanf("%d %d", &u, &v);
		s[u].insert(v); s[v].insert(u);
	}
	dfs(1);
}

Compilation message (stderr)

postmen.cpp: In function 'void dfs(int)':
postmen.cpp:18:3: warning: this 'while' clause does not guard... [-Wmisleading-indentation]
   while(st.top() != u) cout << st.top() << ' ', check[st.top()] = false, st.pop(); st.pop();
   ^~~~~
postmen.cpp:18:84: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'while'
   while(st.top() != u) cout << st.top() << ' ', check[st.top()] = false, st.pop(); st.pop();
                                                                                    ^~
postmen.cpp: In function 'int main()':
postmen.cpp:25:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &m);
  ~~~~~^~~~~~~~~~~~~~~~~
postmen.cpp:28:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &u, &v);
   ~~~~~^~~~~~~~~~~~~~~~~

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