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Submission #858394

# Submission time Handle Problem Language Result Execution time Memory
858394 2023-10-08T10:53:23 Z Tenis0206 One-Way Streets (CEOI17_oneway) C++11
100 / 100
 91 ms 27336 KB 
#include <bits/stdc++.h>

using namespace std;

const int nmax = 1e5;
const int oo = INT_MAX;

int n,m,k;

pair<int,int> e[nmax + 5];
vector<pair<int,int>> G[nmax + 5];

bool sel[nmax + 5];

int lvl[nmax + 5], r[nmax + 5];

int p[nmax + 5], u[nmax + 5];

vector<pair<int,int>> rst;

vector<int> out[nmax + 5], in[nmax + 5];

int cnt = 0;

char rez[nmax + 5];

vector<int> l_sel;

int Min_px[nmax + 5], Max_px[nmax + 5], Min_py[nmax + 5], Max_py[nmax + 5];

void dfs(int nod, int nr = 0)
{
    l_sel.push_back(nod);
    p[nod] = (++cnt);
    sel[nod] = true;
    r[nod] = lvl[nod];
    for(auto it : G[nod])
    {
        if(sel[it.first])
        {
            if(it.second!=nr)
            {
                r[nod] = min(r[nod], lvl[it.first]);
            }
            continue;
        }
        lvl[it.first] = 1 + lvl[nod];
        dfs(it.first,it.second);
        r[nod] = min(r[nod], r[it.first]);
    }
    u[nod] = cnt;
}

void solve(int nod, int nr = 0)
{
    sel[nod] = true;
    Min_px[nod] = oo, Max_px[nod] = 0, Min_py[nod] = oo, Max_py[nod] = 0;
    for(auto x : in[nod])
    {
        Min_px[nod] = min(Min_px[nod], p[x]);
        Max_px[nod] = max(Max_px[nod], p[x]);
    }
    for(auto y : out[nod])
    {
        Min_py[nod] = min(Min_py[nod], p[y]);
        Max_py[nod] = max(Max_py[nod], p[y]);
    }
    for(auto it : G[nod])
    {
        if(sel[it.first])
        {
            if(it.second!=nr)
            {
                rez[it.second] = 'B';
            }
            continue;
        }
        solve(it.first,it.second);
        Min_px[nod] = min(Min_px[nod], Min_px[it.first]);
        Max_px[nod] = max(Max_px[nod], Max_px[it.first]);
        Min_py[nod] = min(Min_py[nod], Min_py[it.first]);
        Max_py[nod] = max(Max_py[nod], Max_py[it.first]);
    }
    if(!nr)
    {
        return;
    }
    if(r[nod] < lvl[nod])
    {
        rez[nr] = 'B';
        return;
    }
    bool sus = false, jos = false;
    if(Min_px[nod] < p[nod] || Max_px[nod] > u[nod])
    {
        jos = true;
    }
    if(Min_py[nod] < p[nod] || Max_py[nod] > u[nod])
    {
        sus = true;
    }
    if(jos)
    {
        if(e[nr].second == nod)
        {
            rez[nr] = 'R';
        }
        else
        {
            rez[nr] = 'L';
        }
    }
    if(sus)
    {
        if(e[nr].second == nod)
        {
            rez[nr] = 'L';
        }
        else
        {
            rez[nr] = 'R';
        }
    }
    if(!sus && !jos)
    {
        rez[nr] = 'B';
    }
}

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
#ifdef home
    freopen("nr.in","r",stdin);
    freopen("nr.out","w",stdout);
#endif // home
    cin>>n>>m;
    for(int i=1; i<=m; i++)
    {
        int x,y;
        cin>>x>>y;
        e[i] = {x,y};
        if(x==y)
        {
            rez[i] = 'B';
            continue;
        }
        G[x].push_back({y,i});
        G[y].push_back({x,i});
    }
    cin>>k;
    for(int i=1; i<=k; i++)
    {
        int x,y;
        cin>>x>>y;
        out[x].push_back(y);
        in[y].push_back(x);
        rst.push_back({x,y});
    }
    for(int i=1; i<=n; i++)
    {
        if(!sel[i])
        {
            l_sel.clear();
            dfs(i);
            for(auto it : l_sel)
            {
                sel[it] = false;
            }
            solve(i);
        }
    }
    cout<<rez+1<<'\n';
    return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 10588 KB Output is correct
2 Correct 2 ms 10588 KB Output is correct
3 Correct 3 ms 10588 KB Output is correct
4 Correct 2 ms 10588 KB Output is correct
5 Correct 2 ms 10588 KB Output is correct
6 Correct 3 ms 10588 KB Output is correct
7 Correct 2 ms 10588 KB Output is correct
8 Correct 2 ms 10588 KB Output is correct
9 Correct 2 ms 10588 KB Output is correct
10 Correct 2 ms 10588 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 10588 KB Output is correct
2 Correct 2 ms 10588 KB Output is correct
3 Correct 3 ms 10588 KB Output is correct
4 Correct 2 ms 10588 KB Output is correct
5 Correct 2 ms 10588 KB Output is correct
6 Correct 3 ms 10588 KB Output is correct
7 Correct 2 ms 10588 KB Output is correct
8 Correct 2 ms 10588 KB Output is correct
9 Correct 2 ms 10588 KB Output is correct
10 Correct 2 ms 10588 KB Output is correct
11 Correct 29 ms 15964 KB Output is correct
12 Correct 31 ms 16720 KB Output is correct
13 Correct 31 ms 17904 KB Output is correct
14 Correct 37 ms 18196 KB Output is correct
15 Correct 47 ms 18180 KB Output is correct
16 Correct 34 ms 15820 KB Output is correct
17 Correct 38 ms 17620 KB Output is correct
18 Correct 35 ms 15900 KB Output is correct
19 Correct 38 ms 19148 KB Output is correct
20 Correct 38 ms 16344 KB Output is correct
21 Correct 28 ms 16080 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 10588 KB Output is correct
2 Correct 2 ms 10588 KB Output is correct
3 Correct 3 ms 10588 KB Output is correct
4 Correct 2 ms 10588 KB Output is correct
5 Correct 2 ms 10588 KB Output is correct
6 Correct 3 ms 10588 KB Output is correct
7 Correct 2 ms 10588 KB Output is correct
8 Correct 2 ms 10588 KB Output is correct
9 Correct 2 ms 10588 KB Output is correct
10 Correct 2 ms 10588 KB Output is correct
11 Correct 29 ms 15964 KB Output is correct
12 Correct 31 ms 16720 KB Output is correct
13 Correct 31 ms 17904 KB Output is correct
14 Correct 37 ms 18196 KB Output is correct
15 Correct 47 ms 18180 KB Output is correct
16 Correct 34 ms 15820 KB Output is correct
17 Correct 38 ms 17620 KB Output is correct
18 Correct 35 ms 15900 KB Output is correct
19 Correct 38 ms 19148 KB Output is correct
20 Correct 38 ms 16344 KB Output is correct
21 Correct 28 ms 16080 KB Output is correct
22 Correct 67 ms 21704 KB Output is correct
23 Correct 69 ms 21700 KB Output is correct
24 Correct 70 ms 21964 KB Output is correct
25 Correct 91 ms 27336 KB Output is correct
26 Correct 71 ms 23348 KB Output is correct
27 Correct 72 ms 21856 KB Output is correct
28 Correct 23 ms 16360 KB Output is correct
29 Correct 53 ms 21212 KB Output is correct
30 Correct 57 ms 21324 KB Output is correct
31 Correct 61 ms 21700 KB Output is correct
32 Correct 61 ms 24192 KB Output is correct