Submission #42315

#	Time	Username	Problem	Language	Result	Execution time	Memory
42315		IvanC	Senior Postmen (BOI14_postmen)	C++14	55 / 100	656 ms	108048 KiB

postmen

#include <bits/stdc++.h>
using namespace std;
typedef vector<int> vi;
const int MAXN = 5*1e5 + 10;
int N,M,posicao[MAXN],marcado[MAXN];
set<int> cjt[MAXN];
vi pilha,temporario;
vector<vi> resposta;
void dfs(int v){
	marcado[v] = 1;
	posicao[v] = pilha.size();
	pilha.push_back(v);
	while(!cjt[v].empty() && posicao[v] != -1){
		int u = *(cjt[v].begin());
		cjt[v].erase(u);
		cjt[u].erase(v);
		if(marcado[u]){
			for(int i = posicao[v];i>posicao[u];i--){
				int k = pilha[i];
				posicao[k] = -1;
				marcado[k] = 0;
				temporario.push_back(k);
				pilha.pop_back(); 
			}
			temporario.push_back(u);
			resposta.push_back(temporario);
			temporario.clear();
			return;
		}
		else{
			dfs(u);
		}
	}
	if(posicao[v] == -1) return;
}
int main(){
	scanf("%d %d",&N,&M);
	for(int i = 1;i<=N;i++) posicao[i] = -1;
	for(int i = 1;i<=M;i++){
		int u,v;
		scanf("%d %d",&u,&v);
		cjt[u].insert(v);
		cjt[v].insert(u);
	}
	for(int i = 1;i<=N;i++){
		if(!cjt[i].empty()) dfs(i);
	}
	for(int i = 0;i<resposta.size();i++){
		for(int j : resposta[i]) printf("%d ",j);
		printf("\n");
	}
	return 0;
}

Compilation message (stderr)

postmen.cpp: In function 'int main()':
postmen.cpp:48:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0;i<resposta.size();i++){
                ~^~~~~~~~~~~~~~~~
postmen.cpp:37:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d",&N,&M);
  ~~~~~^~~~~~~~~~~~~~~
postmen.cpp:41:8: 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