/*
#pragma GCC optimize("O2")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx,avx2,sse,sse2,fma")
//*/
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int , int> pii;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const ll maxn = 3e6;
const ll mod = 1e9+7;
const ld PI = acos((ld)-1);
#define pb push_back
#define endl '\n'
#define dokme(x) cout << x , exit(0)
#define migmig ios::sync_with_stdio(false),cin.tie(0),cout.tie(0)
#define ms(x , y) memset(x , y , sizeof x)
ll pw(ll a, ll b, ll md = mod){ll res = 1;while(b){if(b&1){res=(a*res)%md;}a=(a*a)%md;b>>=1;}return(res);}
int n , m , p;
vector < int > adj[maxn];
vector < pii > e;
vector < pii > query;
int par[maxn];
bool mark[maxn];
int h[maxn];
int up[maxn];
int getpar(int v){
return((v == par[v]) ? v : par[v] = getpar(par[v]));
}
void merge(int u, int v){
if((v = getpar(v)) == (u = getpar(u)))
return;
par[u] = v;
}
void dfs(int v , int p = 0){
mark[v] = 1;
up[v] = h[v];
for(auto u : adj[v])
if(!mark[u])
h[u] = h[v] + 1,
dfs(u , v),
up[v] = min(up[v] , up[u]);
else if (u!=p)
up[v] = min(up[v] , h[u]);
if(up[v] < h[v])
merge(v , p);
}
int prt[maxn];
vector < int > Adj[maxn];
int H[maxn];
void DFS(int v){
mark[v] = 1;
for(auto u : Adj[v])
if(!mark[u])
H[u] = H[v] + 1, DFS(u) , prt[v] += prt[u];
}
int32_t main(){
migmig;
cin >> n >> m;
for(int i = 1 ; i <= m ; i ++){
int u , v;
cin >> u >> v;
adj[u].pb(v);
adj[v].pb(u);
e.pb({u , v});
}
cin >> p;
for(int i = 0 ; i < p ; i ++){
int x , y;
cin >> x >> y;
query.pb({x , y});
}
for(int i = 1 ; i <= n ; i ++)
par[i] = i;
for(int i = 1 ; i <= n ; i ++)
if(!mark[i])dfs(i);
for(int i = 0 ; i < p ; i ++){
int u = query[i].first;
int v = query[i].second;
if(getpar(u) == getpar(v))continue;
prt[getpar(u)]++ , prt[getpar(v)]--;
}
for(int i = 0 ; i < m ; i ++){
int u = e[i].first;
int v = e[i].second;
if(getpar(u) == getpar(v))continue;
Adj[getpar(u)].pb(getpar(v));
Adj[getpar(v)].pb(getpar(u));
}
ms(mark , 0);
for(int i = 1 ; i <= n ; i ++)
if(!mark[getpar(i)])DFS(getpar(i));
for(auto uv : e){
if(getpar(uv.first) == getpar(uv.second))
cout << "B";
else{
int u = getpar(uv.first) , v = getpar(uv.second);
if(H[u] > H[v]){
if(prt[u] == 0){
cout << "B";
continue;
}
if(prt[u] > 0)
cout << "R";
else
cout << "L";
}
else{
if(prt[v] == 0){
cout << "B";
continue;
}
if(prt[v] > 0)
cout << "R";
else
cout << "L";
}
}
}
return(0);
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
98 ms |
144236 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
98 ms |
144236 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
98 ms |
144236 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
