Submission #49490

#	Time	Username	Problem	Language	Result	Execution time	Memory
49490		minkank	Senior Postmen (BOI14_postmen)	C++17	55 / 100	533 ms	63492 KiB

postmen

#include <bits/stdc++.h>
using namespace std;
 
typedef pair<int, int> ii;
 
const int N = 5e5 + 5;
int n, m, st[N], p, ptr[N];
bool check[N], sax[N];
vector<int> s[N];
vector<ii> edge;
 
void dfs(int u) {
	while(ptr[u] >= 0) {
		int id = s[u][ptr[u]]; ptr[u]--;
		if(sax[id]) continue;
		sax[id] = true;
		int v; if(edge[id].first == u) v = edge[id].second; else v = edge[id].first;
		dfs(v);
	}
	if(check[u]) {
		while(st[p] != u) cout << st[p] << ' ', check[st[p]] = false, p--; p--;
		printf("%d\n", u);		
	}
	check[u] = 1; ++p; st[p] = u;
}
 
void get(int &x) {
	x = 0;
	char c = getchar();
	while(c > '9' || c < '0') c = getchar();
	while(c >= '0' && c <= '9') x = (x << 3) + (x << 1) + c - '0', c = getchar();
}
 
int main() {
	get(n); get(m);
	for(int i = 1; i <= m; ++i) {
		int u, v;
		get(u); get(v);
		s[u].push_back(edge.size()); s[v].push_back(edge.size());
		edge.push_back(ii(u, v));
	}
	for(int i = 1; i <= n; ++i) ptr[i] = s[i].size() - 1;
	dfs(1);
}

Compilation message (stderr)

postmen.cpp: In function 'void dfs(int)':
postmen.cpp:21:3: warning: this 'while' clause does not guard... [-Wmisleading-indentation]
   while(st[p] != u) cout << st[p] << ' ', check[st[p]] = false, p--; p--;
   ^~~~~
postmen.cpp:21:70: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'while'
   while(st[p] != u) cout << st[p] << ' ', check[st[p]] = false, p--; p--;
                                                                      ^

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