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Submission #655843

# Submission time Handle Problem Language Result Execution time Memory
655843 2022-11-05T18:53:26 Z manizare One-Way Streets (CEOI17_oneway) C++17
60 / 100
 522 ms 262144 KB 
#include<bits/stdc++.h>
#define all(a) a.begin(),a.end()
#define pb push_back
using namespace std ;

const int maxn = 2e6 + 10 , maxq = 502 , inf = 1e9 , mod = 1e9+7 ;
vector <pair <int , int > > G[maxn] ;
vector <int>  l[maxn] ;
int dp[maxn] , mark2[maxn] , mark[maxn] , par[maxn]  , cnt = 1 ,c[maxn] , st[maxn] , en[maxn] , pr[maxn] , pp[maxn] , ans[maxn] , ok[maxn]; 
pair <int , int > ed[maxn] ;
void dfs(int v){ 
	mark[v] = 1;
	for(int i = 0; i < (int)G[v].size() ; i++){
		int u = G[v][i].first , id = G[v][i].second ;
		if(mark[u] == 1){
			if(mark2[id] == 0){
				dp[v] ++ ;
				dp[u] -- ;
				ans[id] = 3 ;
				mark2[id] = 1; 
			}
			continue ;
		}
		mark2[id] = 1;
		par[u] = id ;
		dfs(u) ;
		dp[v]+=dp[u];
	}
}

void dfs2(int v , int r){
	mark[v] = 1;
	c[v] = r ;
	for(int i = 0; i < (int)G[v].size() ; i++){
		int u = G[v][i].first , id = G[v][i].second ;
		if(mark[u] == 1)continue ;
		if(dp[u] == 0){
			cnt ++;
			//cout << v << " " << u << "<---\n";
			pr[cnt] = id ;
			pp[cnt] = r ;
			l[r].pb(cnt);
			dfs2(u , cnt);
		}else{
			dfs2(u , r);
		}
	}
}
vector <int> vv[maxn] , uu[maxn] ;
int sec = 1 ;
void dfs3(int v){
	mark[v] = 1;
	for(int i = 0 ;i < (int)l[v].size() ; i++){
		int u = l[v][i] ;
		dfs3(u);
	}
	if(pp[v] == 0)return ; 
	int ok = 0 ;
	vector <int> xx , yy ;
	sort(all(vv[v]));sort(all(uu[v]));
	while(vv[v].size() > 0 && uu[v].size() > 0){
		int vx = vv[v].back() , vz = uu[v].back() ;
		if(vx == vz){
			vv[v].pop_back();
			uu[v].pop_back();
		}else if(vx > vz){
			vv[pp[v]].pb(vx);
			xx.pb(vx);
			vv[v].pop_back();
		}else{
			yy.pb(vz);
			uu[pp[v]].pb(vz);
			uu[v].pop_back();
		}
	}
	while(vv[v].size() > 0){
		int vx = vv[v].back(); vv[v].pop_back();
		xx.pb(vx);
		vv[pp[v]].pb(vx);
	}
	while(uu[v].size() > 0){
		int vx = uu[v].back() ; uu[v].pop_back();
		yy.pb(vx);
		uu[pp[v]].pb(vx);
	}
	int id = pr[v]; 
	if(xx.size() == 0 && yy.size() ==0 ){
		ans[pr[v]] = 3 ;
	}else if (yy.size() == 0){
		if(c[ed[id].first] == v){
			ans[id] = 2 ; 
		}else{
			ans[id] = 1 ;
		}
	}else{
		if(c[ed[id].first] == v){
			ans[id] = 1 ;
		}else{
			ans[id] = 2 ;
		}
	}
	uu[v].clear();
	vv[v].clear();
}

signed main(){
	ios::sync_with_stdio(false); cin.tie(0);cout.tie(0);
	int n , m ;
	cin >> n >> m ;
	for(int i =1  ;i <= m ; i++){
		int v , u ;
		cin >> v >> u ;
		if(v==u){
			ans[i] = 3; 
			continue ;
		}
		G[v].pb({u,i});
		G[u].pb({v,i});
		ed[i] = {v , u} ;
	}
	for(int i = 1; i <= n ; i++){
		if(mark[i] == 1)continue ;
		dfs(i);
	}
	for(int i =1 ; i <= n ; i++){
		if(par[i] == 0)continue ;
		if(dp[i] >= 1){
			ans[par[i]] = 3 ;
		}
	}
	memset(mark , 0 , sizeof mark);
	memset(mark2 , 0 , sizeof mark2);
	vector <int> vec ;
	for(int i =1; i <= n ; i ++){
		if(mark[i] == 1)continue ;
		vec.pb(cnt);
		dfs2(i ,cnt ) ;
		cnt++;
	}
	memset(mark , 0 , sizeof mark);

	int q ;
	cin >> q ;
	while(q--){
		int v , u ;
		cin >> v >> u ;
		if(c[v] == c[u])continue ;
		vv[c[v]].pb(q);
		uu[c[u]].pb(q);
	}
	for(int i =0 ; i < (int)vec.size() ;i++){
		int u = vec[i]; 
		dfs3(u);
	}
	for(int i = 1 ; i <= m ; i++){
		if(ans[i] == 3){
			cout << "B";
		}
		if(ans[i] == 2){
			cout << "R";
		}
		if(ans[i] == 1){
			cout << "L" ;
		}
	}
	cout << endl;
}

Compilation message

oneway.cpp: In function 'void dfs3(int)':
oneway.cpp:58:6: warning: unused variable 'ok' [-Wunused-variable]
   58 |  int ok = 0 ;
      |      ^~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 91 ms 203852 KB Output is correct
2 Correct 91 ms 203820 KB Output is correct
3 Correct 91 ms 203940 KB Output is correct
4 Correct 94 ms 203932 KB Output is correct
5 Correct 90 ms 204104 KB Output is correct
6 Correct 92 ms 203936 KB Output is correct
7 Correct 96 ms 204092 KB Output is correct
8 Correct 92 ms 203964 KB Output is correct
9 Correct 90 ms 203920 KB Output is correct
10 Correct 95 ms 203948 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 91 ms 203852 KB Output is correct
2 Correct 91 ms 203820 KB Output is correct
3 Correct 91 ms 203940 KB Output is correct
4 Correct 94 ms 203932 KB Output is correct
5 Correct 90 ms 204104 KB Output is correct
6 Correct 92 ms 203936 KB Output is correct
7 Correct 96 ms 204092 KB Output is correct
8 Correct 92 ms 203964 KB Output is correct
9 Correct 90 ms 203920 KB Output is correct
10 Correct 95 ms 203948 KB Output is correct
11 Correct 135 ms 209308 KB Output is correct
12 Correct 129 ms 210104 KB Output is correct
13 Correct 143 ms 211252 KB Output is correct
14 Correct 148 ms 212184 KB Output is correct
15 Correct 147 ms 212428 KB Output is correct
16 Correct 145 ms 212432 KB Output is correct
17 Correct 194 ms 228748 KB Output is correct
18 Correct 146 ms 212456 KB Output is correct
19 Correct 188 ms 231736 KB Output is correct
20 Correct 140 ms 209852 KB Output is correct
21 Correct 127 ms 209608 KB Output is correct

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 91 ms 203852 KB Output is correct
2 Correct 91 ms 203820 KB Output is correct
3 Correct 91 ms 203940 KB Output is correct
4 Correct 94 ms 203932 KB Output is correct
5 Correct 90 ms 204104 KB Output is correct
6 Correct 92 ms 203936 KB Output is correct
7 Correct 96 ms 204092 KB Output is correct
8 Correct 92 ms 203964 KB Output is correct
9 Correct 90 ms 203920 KB Output is correct
10 Correct 95 ms 203948 KB Output is correct
11 Correct 135 ms 209308 KB Output is correct
12 Correct 129 ms 210104 KB Output is correct
13 Correct 143 ms 211252 KB Output is correct
14 Correct 148 ms 212184 KB Output is correct
15 Correct 147 ms 212428 KB Output is correct
16 Correct 145 ms 212432 KB Output is correct
17 Correct 194 ms 228748 KB Output is correct
18 Correct 146 ms 212456 KB Output is correct
19 Correct 188 ms 231736 KB Output is correct
20 Correct 140 ms 209852 KB Output is correct
21 Correct 127 ms 209608 KB Output is correct
22 Runtime error 522 ms 262144 KB Execution killed with signal 9
23 Halted 0 ms 0 KB -