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Submission #986322

# Submission time Handle Problem Language Result Execution time Memory
986322 2024-05-20T10:11:48 Z parlimoos One-Way Streets (CEOI17_oneway) C++14
100 / 100
 75 ms 22000 KB 
//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(b < a) swap(a , 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 , ms[v] = 1;
    for(int u : tr[v]){
        if(u == p) continue;
        dfs1(u , v);
    }
    tms[v][1] = timer;
}
void f1(){
    fill(&dsu[0] , &dsu[n] , -1);
    for(int i = 0 ; i < n ; i++) if(!ms[i]) tarjan(i , -1);
    for(int e = 0 ; e < m ; e++){
        if(emd[e] == 1) continue;
        uDsu(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);
        }
    }
    fill(&ms[0] , &ms[n] , 0);
    for(int i = 0 ; i < n ; i++) if(findDsu(i) == i and !ms[i]) dfs1(i , -1);
}
void dfs2(int v = 0 , int p = -1){
    ms[v] = 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]--;
    }
    fill(&ms[0] , &ms[n] , 0);
    for(int i = 0 ; i < n ; i++) if(findDsu(i) == i and !ms[i]) dfs2(i , -1);
    for(int e = 0 ; e < m ; e++){
        if(emd[e] == 0) cout << 'B';
        else{
            int v = findDsu(es[e][0]) , u = findDsu(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';
            }
        }
    }
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 7768 KB Output is correct
2 Correct 2 ms 7772 KB Output is correct
3 Correct 3 ms 7772 KB Output is correct
4 Correct 2 ms 7820 KB Output is correct
5 Correct 3 ms 8024 KB Output is correct
6 Correct 2 ms 7856 KB Output is correct
7 Correct 3 ms 7772 KB Output is correct
8 Correct 2 ms 7772 KB Output is correct
9 Correct 2 ms 7768 KB Output is correct
10 Correct 2 ms 7772 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 7768 KB Output is correct
2 Correct 2 ms 7772 KB Output is correct
3 Correct 3 ms 7772 KB Output is correct
4 Correct 2 ms 7820 KB Output is correct
5 Correct 3 ms 8024 KB Output is correct
6 Correct 2 ms 7856 KB Output is correct
7 Correct 3 ms 7772 KB Output is correct
8 Correct 2 ms 7772 KB Output is correct
9 Correct 2 ms 7768 KB Output is correct
10 Correct 2 ms 7772 KB Output is correct
11 Correct 28 ms 12468 KB Output is correct
12 Correct 33 ms 13196 KB Output is correct
13 Correct 39 ms 14424 KB Output is correct
14 Correct 47 ms 15400 KB Output is correct
15 Correct 45 ms 15808 KB Output is correct
16 Correct 50 ms 16332 KB Output is correct
17 Correct 50 ms 17796 KB Output is correct
18 Correct 47 ms 16328 KB Output is correct
19 Correct 50 ms 19052 KB Output is correct
20 Correct 29 ms 12900 KB Output is correct
21 Correct 29 ms 12752 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 7768 KB Output is correct
2 Correct 2 ms 7772 KB Output is correct
3 Correct 3 ms 7772 KB Output is correct
4 Correct 2 ms 7820 KB Output is correct
5 Correct 3 ms 8024 KB Output is correct
6 Correct 2 ms 7856 KB Output is correct
7 Correct 3 ms 7772 KB Output is correct
8 Correct 2 ms 7772 KB Output is correct
9 Correct 2 ms 7768 KB Output is correct
10 Correct 2 ms 7772 KB Output is correct
11 Correct 28 ms 12468 KB Output is correct
12 Correct 33 ms 13196 KB Output is correct
13 Correct 39 ms 14424 KB Output is correct
14 Correct 47 ms 15400 KB Output is correct
15 Correct 45 ms 15808 KB Output is correct
16 Correct 50 ms 16332 KB Output is correct
17 Correct 50 ms 17796 KB Output is correct
18 Correct 47 ms 16328 KB Output is correct
19 Correct 50 ms 19052 KB Output is correct
20 Correct 29 ms 12900 KB Output is correct
21 Correct 29 ms 12752 KB Output is correct
22 Correct 61 ms 19140 KB Output is correct
23 Correct 75 ms 17336 KB Output is correct
24 Correct 63 ms 17604 KB Output is correct
25 Correct 61 ms 22000 KB Output is correct
26 Correct 57 ms 18624 KB Output is correct
27 Correct 63 ms 17604 KB Output is correct
28 Correct 27 ms 10960 KB Output is correct
29 Correct 41 ms 13520 KB Output is correct
30 Correct 40 ms 13800 KB Output is correct
31 Correct 44 ms 14044 KB Output is correct
32 Correct 48 ms 17016 KB Output is correct