//Be Name KHODA
#pragma GCC optimize("Ofast")
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define pb push_back
#define pp pop_back
#define lb lower_bound
#define ub upper_bound
#define cl clear
#define bg begin
#define arr(x) array<int , x>
#define endl '\n'
int n , m , q;
vector<arr(2)> es;
vector<int> g[100000] , tr[100000];
int tin[100000] , low[100000] , emd[100000];
bool ms[100000];
int dsu[100000] , tms[100000][2] , dir[100000];
int findDsu(int v){
if(dsu[v] == -1) return v;
return (dsu[v] = findDsu(dsu[v]));
}
void uDsu(int a , int b){
a = findDsu(a) , b = findDsu(b);
if(a != b) dsu[b] = a;
}
int timer = 0;
void tarjan(int v = 0 , int p = -1){
ms[v] = 1 , tin[v] = timer++ , low[v] = tin[v];
for(int e : g[v]){
if(e == p) continue;
int u = es[e][0] + es[e][1] - v;
if(ms[u]) low[v] = min(low[v] , tin[u]);
else{
tarjan(u , e) , low[v] = min(low[v] , low[u]);
if(low[u] > tin[v]) emd[e] = 1;
}
}
}
void dfs1(int v = 0 , int p = -1){
if(v == 0) timer = -1;
tms[v][0] = ++timer;
for(int u : tr[v]){
if(u == p) continue;
dfs1(u , v);
}
tms[v][1] = timer;
}
void f1(){
fill(&dsu[0] , &dsu[n] , -1) , tarjan();
for(int e = 0 ; e < m ; e++){
if(emd[e] == 1) continue;
uDsu(min(es[e][0] , es[e][1]) , max(es[e][0] , es[e][1]));
}
for(int e = 0 ; e < m ; e++){
if(emd[e] == 1){
int v = findDsu(es[e][0]) , u = findDsu(es[e][1]);
tr[v].pb(u) , tr[u].pb(v);
}
}
dfs1();
}
void dfs2(int v = 0 , int p = -1){
for(int u : tr[v]){
if(u == p) continue;
dfs2(u , v) , dir[v] += dir[u];
}
}
int main(){
ios::sync_with_stdio(0);
cin.tie(0);
cin >> n >> m;
for(int i = 0 ; i < m ; i++){
int v , u;
cin >> v >> u;
v-- , u--;
es.pb({v , u}) , g[v].pb(i) , g[u].pb(i);
}
f1();
cin >> q;
for(int i = 0 ; i < q ; i++){
int v , u;
cin >> v >> u;
v-- , u--;
v = findDsu(v) , u = findDsu(u);
dir[v]++ , dir[u]--;
}
dfs2();
for(int e = 0 ; e < m ; e++){
if(emd[e] == 0) cout << 'B';
else{
int v = es[e][0] , u = es[e][1];
if(tms[v][0] < tms[u][0]){
if(dir[u] == 0) cout << 'B';
else if(dir[u] < 0) cout << 'R';
else cout << 'L';
}else{
if(dir[v] == 0) cout << 'B';
else if(dir[v] < 0) cout << 'L';
else cout << 'R';
}
}
}
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
7772 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
7772 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
7772 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
