제출 #86672

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
86672		dimash241	Pipes (CEOI15_pipes)	C++17	0 / 100	735 ms	65536 KiB

pipes

# include <stdio.h>
# include <bits/stdc++.h>

#define Accepted 0
#define pb push_back
#define F first
#define S second
#define For(i,x,y)  for (int i = x; i <= y; i ++) 
#define FOr(i,x,y)  for (int i = x; i >= y; i --)
#define SpeedForce ios_base::sync_with_stdio(0), cin.tie(0)

using namespace std;
 
int n, m;
bitset < 100101 > g[100101];
vector < pair < int, int > > ans;

int tin[100101];
int fup[100101];
int timer;

inline void dfs (int v, int par = 0) {
	tin[v] = fup[v] = ++ timer;
	for (int i = g[v]._Find_first(); i < g[v].size(); i = g[v]._Find_next(i)) {
		if (i == par) continue;
		if (tin[i]) {
			fup[v] = min(fup[v], tin[i]);
		} else {
			dfs (i, v);
			fup[v] = min(fup[v], fup[i]);
			if (tin[v] < fup[i]) {
				ans.pb({v, i});
			}
		}
	}
}

int main () {               
    cin >> n >> m;
    For (i, 1, m) {
    	int l, r;
    	cin >> l >> r;
    	g[l][r] = 1;
    	g[r][l] = 1;
    }

    For (i, 1, n) {
    	if (!tin[i]) {
    		dfs (i);
    	}
    }

    for (auto it : ans)
    	cout << it.F << ' ' << it.S << '\n';
    return Accepted;
}             

컴파일 시 표준 에러 (stderr) 메시지

pipes.cpp: In function 'void dfs(int, int)':
pipes.cpp:24:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = g[v]._Find_first(); i < g[v].size(); i = g[v]._Find_next(i)) {
                                   ~~^~~~~~~~~~~~~

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