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Submission #349298

# Submission time Handle Problem Language Result Execution time Memory
349298 2021-01-17T11:11:07 Z doowey One-Way Streets (CEOI17_oneway) C++14
100 / 100
 102 ms 17244 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

#define fi first
#define se second
#define mp make_pair
#define fastIO ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);

const int N = (int)1e5 + 10;
vector<pii> T[N];
int tin[N];
int tout[N];
int low[N];
int u[N], v[N];
bool bridge[N];
int ti;
bool use[N];

void dfs(int u, int pp){
    ti++;
    tin[u]=ti;
    low[u]=tin[u];
    for(auto x : T[u]){
        if(tin[x.fi] == 0){
            dfs(x.fi,x.se);
            use[x.se]=true;
            low[u]=min(low[u],low[x.fi]);
            if(tin[u] < low[x.fi]){
                bridge[x.se]=true;
            }
        }
        else if(x.se != pp){
            low[u]=min(low[u],tin[x.fi]);
        }
    }
    tout[u]=ti;
}


char sol[N];

void setd(int xi, int yi, int id){
    if(xi == u[id]){
        sol[id]='R';
    }
    else{
        sol[id]='L';
    }
}

int in_low[N], in_high[N];
int out_low[N], out_high[N];

void dfs2(int u, int pi){
    for(auto x : T[u]){
        if(use[x.se] && x.se != pi){
            dfs2(x.fi,x.se);
            in_low[u]=min(in_low[u],in_low[x.fi]);
            out_low[u]=min(out_low[u],out_low[x.fi]);
            in_high[u]=max(in_high[u],in_high[x.fi]);
            out_high[u]=max(out_high[u],out_high[x.fi]);
            if(bridge[x.se]){
                if(in_low[x.fi] < tin[x.fi] || in_high[x.fi] > tout[x.fi]){
                    setd(u,x.fi,x.se);
                }
                else if(out_low[x.fi] < tin[x.fi] || out_high[x.fi] > tout[x.fi]){
                    setd(x.fi,u,x.se);
                }
            }
        }
    }
}

int main(){
    fastIO;
    int n, m, p;
    cin >> n >> m;
    for(int i = 1; i <= m; i ++ ){
        cin >> u[i] >> v[i];
        T[u[i]].push_back(mp(v[i],i));
        T[v[i]].push_back(mp(u[i],i));
    }
    vector<int> ord;
    for(int i = 1; i <= n; i ++ ){
        if(tin[i] == 0){
            ord.push_back(i);
            dfs(i,-1);
        }
    }
    for(int i = 1; i <= m; i ++ ){
        sol[i]='B';
    }
    for(int i = 1; i <= n; i ++ ){
        in_low[i]=n+1;
        out_low[i]=n+1;
    }
    cin >> p;
    int xi, yi;
    for(int i = 1; i <= p ; i ++ ){
        cin >> xi >> yi;
        in_low[yi]=min(in_low[yi],tin[xi]);
        out_low[xi]=min(out_low[xi],tin[yi]);
        in_high[yi]=max(in_high[yi],tin[xi]);
        out_high[xi]=max(out_high[xi],tin[yi]);
    }
    for(auto x : ord )
        dfs2(x,-1);
    for(int i = 1; i <= m ; i ++ ){
        cout << sol[i];
    }
    cout << "\n";
    return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2796 KB Output is correct
2 Correct 2 ms 2796 KB Output is correct
3 Correct 3 ms 2796 KB Output is correct
4 Correct 3 ms 2796 KB Output is correct
5 Correct 2 ms 2796 KB Output is correct
6 Correct 2 ms 2796 KB Output is correct
7 Correct 3 ms 2796 KB Output is correct
8 Correct 3 ms 2816 KB Output is correct
9 Correct 3 ms 2924 KB Output is correct
10 Correct 2 ms 2796 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2796 KB Output is correct
2 Correct 2 ms 2796 KB Output is correct
3 Correct 3 ms 2796 KB Output is correct
4 Correct 3 ms 2796 KB Output is correct
5 Correct 2 ms 2796 KB Output is correct
6 Correct 2 ms 2796 KB Output is correct
7 Correct 3 ms 2796 KB Output is correct
8 Correct 3 ms 2816 KB Output is correct
9 Correct 3 ms 2924 KB Output is correct
10 Correct 2 ms 2796 KB Output is correct
11 Correct 45 ms 8812 KB Output is correct
12 Correct 53 ms 9996 KB Output is correct
13 Correct 63 ms 11244 KB Output is correct
14 Correct 74 ms 12396 KB Output is correct
15 Correct 87 ms 12672 KB Output is correct
16 Correct 81 ms 10860 KB Output is correct
17 Correct 68 ms 12396 KB Output is correct
18 Correct 81 ms 10820 KB Output is correct
19 Correct 61 ms 13548 KB Output is correct
20 Correct 53 ms 9708 KB Output is correct
21 Correct 48 ms 9580 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2796 KB Output is correct
2 Correct 2 ms 2796 KB Output is correct
3 Correct 3 ms 2796 KB Output is correct
4 Correct 3 ms 2796 KB Output is correct
5 Correct 2 ms 2796 KB Output is correct
6 Correct 2 ms 2796 KB Output is correct
7 Correct 3 ms 2796 KB Output is correct
8 Correct 3 ms 2816 KB Output is correct
9 Correct 3 ms 2924 KB Output is correct
10 Correct 2 ms 2796 KB Output is correct
11 Correct 45 ms 8812 KB Output is correct
12 Correct 53 ms 9996 KB Output is correct
13 Correct 63 ms 11244 KB Output is correct
14 Correct 74 ms 12396 KB Output is correct
15 Correct 87 ms 12672 KB Output is correct
16 Correct 81 ms 10860 KB Output is correct
17 Correct 68 ms 12396 KB Output is correct
18 Correct 81 ms 10820 KB Output is correct
19 Correct 61 ms 13548 KB Output is correct
20 Correct 53 ms 9708 KB Output is correct
21 Correct 48 ms 9580 KB Output is correct
22 Correct 94 ms 13292 KB Output is correct
23 Correct 91 ms 12652 KB Output is correct
24 Correct 102 ms 12780 KB Output is correct
25 Correct 82 ms 17244 KB Output is correct
26 Correct 90 ms 13932 KB Output is correct
27 Correct 88 ms 12652 KB Output is correct
28 Correct 39 ms 7020 KB Output is correct
29 Correct 72 ms 11244 KB Output is correct
30 Correct 75 ms 11372 KB Output is correct
31 Correct 76 ms 11628 KB Output is correct
32 Correct 69 ms 13804 KB Output is correct