oj.uz

Submission #246944

# Submission time Handle Problem Language Result Execution time Memory
246944 2020-07-10T15:41:17 Z errorgorn One-Way Streets (CEOI17_oneway) C++14
100 / 100
 392 ms 55312 KB 
//雪花飄飄北風嘯嘯
//天地一片蒼茫

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/rope>
using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;
#define ll long long
#define ii pair<ll,ll>
#define iii pair<ii,ll>
#define fi first
#define se second
#define endl '\n'
#define debug(x) cout << #x << " is " << x << endl;

#define rep(x,start,end) for(auto x=(start)-((start)>(end));x!=(end)-((start)>(end));((start)<(end)?x++:x--))
#define all(x) (x).begin(),(x).end()
#define sz(x) (int)(x).size()

ll MAX(ll a){return a;}
ll MIN(ll a){return a;}
template<typename... Args>
ll MAX(ll a,Args... args){return max(a,MAX(args...));}
template<typename... Args>
ll MIN(ll a,Args... args){return min(a,MIN(args...));}

#define indexed_set tree<ll,null_type,less<ll>,rb_tree_tag,tree_order_statistics_node_update>

mt19937 rng(chrono::system_clock::now().time_since_epoch().count());

int n,m,q;
vector<ii> al[100005];

int dfs_time[100005];
int low[100005];

set<int> s[100005];
int ans[100005];

int TIME=1;

void dfs(int i,int p){
	dfs_time[i]=low[i]=TIME++;

	for (auto &it:al[i]){
		if (it.se==~p) continue;
		
		if (!dfs_time[it.fi]){
			dfs(it.fi,it.se);
			low[i]=min(low[i],low[it.fi]);
			
			//merge sets
			if (sz(s[it.fi])>sz(s[i])) swap(s[it.fi],s[i]);
			
			for (auto &val:s[it.fi]){
				if (s[i].count(~val)) s[i].erase(~val);
				else s[i].insert(val);
			}
		}
		else{
			low[i]=min(low[i],dfs_time[it.fi]);
		}
	}
	
	int rp=(p>=0?p:~p);
	if (low[i]==dfs_time[i] && !s[i].empty()){
		if (((*s[i].begin())>=0)==(p>=0)) ans[rp]=1;
		else ans[rp]=2;
	}
}



int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	
	cin>>n>>m;
	
	int a,b;
	rep(x,0,m){
		cin>>a>>b;
		
		al[a].push_back(ii(b,x));
		al[b].push_back(ii(a,~x));
	}
	
	cin>>q;
	rep(x,0,q){
		cin>>a>>b;
		
		if (a==b) continue; //think
		
		s[a].insert(x);
		s[b].insert(~x);
	}
	
	rep(x,1,n+1) if (!dfs_time[x]){
		dfs(x,1e9);
	}
	
	rep(x,0,m){
		if (ans[x]==1) cout<<"L";
		else if (ans[x]==2) cout<<"R";
		else cout<<"B";
	}
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 7424 KB Output is correct
2 Correct 8 ms 7424 KB Output is correct
3 Correct 9 ms 7552 KB Output is correct
4 Correct 9 ms 7424 KB Output is correct
5 Correct 9 ms 7552 KB Output is correct
6 Correct 9 ms 7552 KB Output is correct
7 Correct 9 ms 7552 KB Output is correct
8 Correct 9 ms 7424 KB Output is correct
9 Correct 9 ms 7424 KB Output is correct
10 Correct 9 ms 7552 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 7424 KB Output is correct
2 Correct 8 ms 7424 KB Output is correct
3 Correct 9 ms 7552 KB Output is correct
4 Correct 9 ms 7424 KB Output is correct
5 Correct 9 ms 7552 KB Output is correct
6 Correct 9 ms 7552 KB Output is correct
7 Correct 9 ms 7552 KB Output is correct
8 Correct 9 ms 7424 KB Output is correct
9 Correct 9 ms 7424 KB Output is correct
10 Correct 9 ms 7552 KB Output is correct
11 Correct 61 ms 14584 KB Output is correct
12 Correct 64 ms 15736 KB Output is correct
13 Correct 68 ms 16888 KB Output is correct
14 Correct 73 ms 17400 KB Output is correct
15 Correct 78 ms 17272 KB Output is correct
16 Correct 68 ms 13432 KB Output is correct
17 Correct 67 ms 16504 KB Output is correct
18 Correct 86 ms 13816 KB Output is correct
19 Correct 65 ms 18296 KB Output is correct
20 Correct 64 ms 14712 KB Output is correct
21 Correct 57 ms 14712 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 7424 KB Output is correct
2 Correct 8 ms 7424 KB Output is correct
3 Correct 9 ms 7552 KB Output is correct
4 Correct 9 ms 7424 KB Output is correct
5 Correct 9 ms 7552 KB Output is correct
6 Correct 9 ms 7552 KB Output is correct
7 Correct 9 ms 7552 KB Output is correct
8 Correct 9 ms 7424 KB Output is correct
9 Correct 9 ms 7424 KB Output is correct
10 Correct 9 ms 7552 KB Output is correct
11 Correct 61 ms 14584 KB Output is correct
12 Correct 64 ms 15736 KB Output is correct
13 Correct 68 ms 16888 KB Output is correct
14 Correct 73 ms 17400 KB Output is correct
15 Correct 78 ms 17272 KB Output is correct
16 Correct 68 ms 13432 KB Output is correct
17 Correct 67 ms 16504 KB Output is correct
18 Correct 86 ms 13816 KB Output is correct
19 Correct 65 ms 18296 KB Output is correct
20 Correct 64 ms 14712 KB Output is correct
21 Correct 57 ms 14712 KB Output is correct
22 Correct 380 ms 38368 KB Output is correct
23 Correct 348 ms 52732 KB Output is correct
24 Correct 392 ms 55312 KB Output is correct
25 Correct 324 ms 37880 KB Output is correct
26 Correct 355 ms 37624 KB Output is correct
27 Correct 389 ms 44280 KB Output is correct
28 Correct 208 ms 22520 KB Output is correct
29 Correct 307 ms 36472 KB Output is correct
30 Correct 306 ms 36268 KB Output is correct
31 Correct 306 ms 32760 KB Output is correct
32 Correct 250 ms 32632 KB Output is correct