제출 #948294

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
948294		vjudge1	Pipes (CEOI15_pipes)	C++17	20 / 100	780 ms	65536 KiB

pipes

#include <bits/stdc++.h>
using namespace std;
#define Baytoro_Mayrambekov void solve()
#define ios ios::sync_with_stdio(false); cin.tie(NULL);
#define pb push_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define fr first
#define sc second
//#define int long long
#define endl '\n'
const int INF=1e18;
void fopn(string name){
	freopen((name+".in").c_str(),"r",stdin);
	freopen((name+".out").c_str(),"w",stdout);
}
int binpow(int a,int n){
	if(n==0)
		return 1;
	if(n%2==1)
		return binpow(a, n-1)*a;
	else{
		int b=binpow(a, n/2);
		return b*b;
	}
}
const int N=20004;
vector<int> ar[N],up(N),tin(N),color(N);
vector<bool> used(N);
int timer,mxcol=0;
map<pair<int,int>,bool> mp;
map<pair<int,int>,int> e_cnt;
void bridge(int x, int p=-1){
	used[x]=1;
	tin[x]=up[x]=timer++;
	for(auto it: ar[x]){
		if(it==p) continue;
		if(used[it])
			up[x]=min(up[x],tin[it]);
		else{
			bridge(it,x);
			up[x]=min(up[x],up[it]);
			if(up[it]>tin[x]){
				mp[{it,x}]=1;
				mp[{x,it}]=1;
			}
		}
	}
}
void dfs(int x, int c){
	color[x]=c;
	used[x]=1;
	for(auto it: ar[x]){
		if(!used[it] && (!mp[{x,it}] || e_cnt[{x,it}]!=1))
			dfs(it,c);
	}
}
int a,b,c,n,m,i,j,k,x,y,cnt=0,sum=0,res=0;
Baytoro_Mayrambekov{
	cin>>n>>m;
	for(i=0;i<m;i++){
		cin>>a>>b;
		a--;
		b--;
		e_cnt[{a,b}]++;
		e_cnt[{b,a}]++;
		ar[a].pb(b);
		ar[b].pb(a);
	}
	for(i=0;i<n;i++){
		if(!used[i])
			bridge(i);
	}
	used.assign(N,0);
	int c=0;
	for(i=0;i<n;i++){
		if(!used[i])
			dfs(i,++c);
	}
	for(int i=0;i<n;i++){
		for(auto it: ar[i]){
			if(color[i]!=color[it] && i<it){
				cout<<i+1<<' '<<it+1<<endl;
			}
		}
	}
}
main(){
	ios;
	int T=1;
	//cin>>T;
	while(T--){
		solve();
	}
}
 

컴파일 시 표준 에러 (stderr) 메시지

pipes.cpp:12:15: warning: overflow in conversion from 'double' to 'int' changes value from '1.0e+18' to '2147483647' [-Woverflow]
   12 | const int INF=1e18;
      |               ^~~~
pipes.cpp:88:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   88 | main(){
      | ^~~~
pipes.cpp: In function 'void fopn(std::string)':
pipes.cpp:14:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |  freopen((name+".in").c_str(),"r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
pipes.cpp:15:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |  freopen((name+".out").c_str(),"w",stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10