제출 #1011871

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1011871		PenguinsAreCute	Pipes (CEOI15_pipes)	C++17	0 / 100	5069 ms	65536 KiB

pipes

#include <vector>
#include <iostream>
#include <bitset>
using namespace std;
typedef vector<int> vi;
#define pb push_back
#define REP(i, a, b) for(int i = a; i < b; i++)
#define MAXN 100005
vi adj[MAXN];
int h[MAXN], crossEdges[MAXN], par[MAXN];
bitset<MAXN> visited;
void dfs(int x) {
	visited[x] = true;
	for(auto i: adj[x]) if(!visited[i]) {
		par[i]=x;
		h[i]=h[x]+1;
		dfs(i);
	}
}
int dp(int x) {
	for(auto i:adj[x]) if(par[i]==x) crossEdges[x]+=dp(i);
	return crossEdges[x];
}
int main() {
	int N, E, A, B, ans; cin >> N >> E;
	REP(i,0,E) {
		cin >> A >> B;
		adj[A].pb(B);
		adj[B].pb(A);
	}
	REP(i,1,N+1)if(!visited[i]) dfs(i);
	REP(i,1,N+1) visited[i]=0;
	REP(i,1,N+1) for(auto j: adj[i]) {
		if(h[i]>h[j]) crossEdges[i]++;
		else crossEdges[i]--;
	}
	REP(i,1,N+1) if(par[i]&&dp(i)==1) cout << i << " " << par[i] << "\n";
}

컴파일 시 표준 에러 (stderr) 메시지

pipes.cpp: In function 'int main()':
pipes.cpp:25:18: warning: unused variable 'ans' [-Wunused-variable]
   25 |  int N, E, A, B, ans; cin >> N >> E;
      |                  ^~~

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