oj.uz

Submission #161578

# Submission time Handle Problem Language Result Execution time Memory
161578 2019-11-03T07:47:58 Z amoo_safar One-Way Streets (CEOI17_oneway) C++14
100 / 100
 354 ms 41560 KB 
#include <bits/stdc++.h>

#define pb push_back
#define F first
#define S second

using namespace std;

typedef long long ll;
typedef pair<ll, ll> pll;
typedef string str;

const ll Mod = 1e9 + 7;
const int Maxn = 2e5 + 100;

ll par[Maxn];
ll get(ll u){
	if(u == par[u]) return u;
	return par[u] = get(par[u]);
}
void merge(ll u, ll v){
	u = get(u); v = get(v);
	par[u] = v;
	
}

vector<pll> G[Maxn];
vector<ll> H[Maxn];
vector< pll > ed, ed2;
ll ans[Maxn];
ll dep[Maxn];

ll DFS(ll u, ll d, ll p){
	dep[u] = d;
	ll hbk = d;
	ll adj, res;
	for(auto E : G[u]){
		if(E.S == p) continue;
		adj = E.F;
		if(dep[adj]){
			if(dep[adj] < d){merge(u, adj);
				hbk = min(hbk, dep[adj]);
			}	
		} else {
			//cerr << "! " << adj << " " << u << '\n';
			res = DFS(adj, d + 1, E.S);
			if(res != d + 1) merge(u, adj);
			else ed.pb({u, adj});
			hbk = min(hbk, res);
		}
	}
	return hbk;
}

ll sub[Maxn], va[Maxn], dep2[Maxn];
void dfs(ll u, ll p, ll d2){
	dep2[u] = d2;
	for(auto adj : H[u]){
		if(dep2[adj] == 0){
			dfs(adj, u, d2 + 1);
			va[u] += va[adj];
		}
	}
}
map<pll, ll> mp;

int main(){
	ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	iota(par, par + Maxn, 0);
	ll n, m, p;
	cin >> n >> m;
	//assert(n == 5 && m == 6);
	//cout << "BBRBBL\n";
	//return 0;
	ll u, v;
	for(int i = 1; i <= m; i++){
		cin >> u >> v;
		mp[{u, v}] = i;
		G[u].pb({v, i});
		G[v].pb({u, i});
		ed2.pb({u, v});
	}
	for(int i = 1; i <= n; i++) if(dep[i] == 0) DFS(i, 1, -1);
	//for(int i = 1; i <= n; i++) cerr << get(i) << ' ';

	cin >> p;
	for(int i = 0; i < p; i++){
		cin >> u >> v;
		va[get(u)]++;
		va[get(v)]--;
	}
	
	for(auto x : ed2){
		if(get(x.F) == get(x.S)) continue;
		H[get(x.F)].pb(get(x.S));
		H[get(x.S)].pb(get(x.F));
	}
	for(int i = 1; i <= n; i++) if(get(i) == i && dep2[i] == 0) dfs(i, -1, 1);
	
	for(auto x : ed2){
		u = x.F; v = x.S;
		if(get(x.F) == get(x.S)) continue;
		assert(get(x.F) != get(x.S));
		//cerr << "! " << x.F << ' ' << x.S << '\n';
		//cerr << "!" << u << " " << v << '\n';
		if(dep2[get(u)] < dep2[get(v)]) swap(u, v);
		if(va[get(u)] == 0) continue;
		if(va[get(u)] < 0) swap(u, v);
		if(mp.count({u, v})) ans[mp[{u, v}]] = 1;
		else {
			assert( (mp[{v, u}] > 0) );
			ans[mp[{v, u}]] = 2;
		}
	}
	
	for(int i = 1; i <= m; i++) cout << "BRL"[ans[i]];
	cout << '\n';
	return 0;
}
/*
5 6
1 2
1 2
4 3
2 3
1 3
5 1
2
4 5
1 3


5 6
1 2
4 5
4 3
2 3
1 3
5 1
2
4 5
1 3

4 4
1 2
2 3
3 4
3 1
1
3 2


*/

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 11256 KB Output is correct
2 Correct 12 ms 11256 KB Output is correct
3 Correct 14 ms 11512 KB Output is correct
4 Correct 13 ms 11512 KB Output is correct
5 Correct 14 ms 11512 KB Output is correct
6 Correct 13 ms 11512 KB Output is correct
7 Correct 14 ms 11512 KB Output is correct
8 Correct 15 ms 11512 KB Output is correct
9 Correct 13 ms 11512 KB Output is correct
10 Correct 14 ms 11512 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 11256 KB Output is correct
2 Correct 12 ms 11256 KB Output is correct
3 Correct 14 ms 11512 KB Output is correct
4 Correct 13 ms 11512 KB Output is correct
5 Correct 14 ms 11512 KB Output is correct
6 Correct 13 ms 11512 KB Output is correct
7 Correct 14 ms 11512 KB Output is correct
8 Correct 15 ms 11512 KB Output is correct
9 Correct 13 ms 11512 KB Output is correct
10 Correct 14 ms 11512 KB Output is correct
11 Correct 192 ms 27208 KB Output is correct
12 Correct 212 ms 28680 KB Output is correct
13 Correct 196 ms 30180 KB Output is correct
14 Correct 229 ms 31872 KB Output is correct
15 Correct 222 ms 32588 KB Output is correct
16 Correct 241 ms 33512 KB Output is correct
17 Correct 253 ms 36276 KB Output is correct
18 Correct 237 ms 33888 KB Output is correct
19 Correct 254 ms 37856 KB Output is correct
20 Correct 173 ms 27492 KB Output is correct
21 Correct 159 ms 28392 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 11256 KB Output is correct
2 Correct 12 ms 11256 KB Output is correct
3 Correct 14 ms 11512 KB Output is correct
4 Correct 13 ms 11512 KB Output is correct
5 Correct 14 ms 11512 KB Output is correct
6 Correct 13 ms 11512 KB Output is correct
7 Correct 14 ms 11512 KB Output is correct
8 Correct 15 ms 11512 KB Output is correct
9 Correct 13 ms 11512 KB Output is correct
10 Correct 14 ms 11512 KB Output is correct
11 Correct 192 ms 27208 KB Output is correct
12 Correct 212 ms 28680 KB Output is correct
13 Correct 196 ms 30180 KB Output is correct
14 Correct 229 ms 31872 KB Output is correct
15 Correct 222 ms 32588 KB Output is correct
16 Correct 241 ms 33512 KB Output is correct
17 Correct 253 ms 36276 KB Output is correct
18 Correct 237 ms 33888 KB Output is correct
19 Correct 254 ms 37856 KB Output is correct
20 Correct 173 ms 27492 KB Output is correct
21 Correct 159 ms 28392 KB Output is correct
22 Correct 316 ms 37448 KB Output is correct
23 Correct 313 ms 35040 KB Output is correct
24 Correct 354 ms 35236 KB Output is correct
25 Correct 313 ms 41560 KB Output is correct
26 Correct 311 ms 36832 KB Output is correct
27 Correct 315 ms 35212 KB Output is correct
28 Correct 84 ms 18916 KB Output is correct
29 Correct 246 ms 28140 KB Output is correct
30 Correct 198 ms 28900 KB Output is correct
31 Correct 205 ms 28644 KB Output is correct
32 Correct 211 ms 33252 KB Output is correct