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Submission #760350

# Submission time Handle Problem Language Result Execution time Memory
760350 2023-06-17T13:27:55 Z MohamedFaresNebili One-Way Streets (CEOI17_oneway) C++14
100 / 100
 83 ms 17036 KB 
#include <bits/stdc++.h>

            using namespace std;

            int N, M, Q, X[100005], Y[100005], P[100005];
            int timer, E[100005], tin[100005], low[100005];
            int S[100005], dep[100005];
            bool isBridge[100005];
            vector<int> adj[100005];

            int findSet(int v) {
                if(P[v] == v) return v;
                return P[v] = findSet(P[v]);
            }
            void unionSet(int u, int v) {
                u = findSet(u), v = findSet(v);
                if(u == v) return;
                P[u] = v;
            }
            void dfs(int v, int p) {
                tin[v] = low[v] = timer++;
                for(auto e : adj[v]) {
                    int u = v ^ E[e];
                    if(tin[u] != -1 && e != p) low[v] = min(low[v], tin[u]);
                    else if(tin[u] == -1) {
                        dfs(u, e);
                        low[v] = min(low[v], low[u]);
                        if(low[u] > tin[v]) isBridge[e] = 1;
                    }
                }
            }
            void solve(int v, int p) {
                for(auto e : adj[v]) {
                    int u = v ^ E[e];
                    if(u == p) continue;
                    dep[u] = dep[v] + 1;
                    solve(u, v); S[v] += S[u];
                }
            }

            int32_t main() {
                ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
                cin >> N >> M;
                for(int l = 1; l <= N; l++) P[l] = l;
                for(int l = 1; l <= M; l++) {
                    cin >> X[l] >> Y[l];
                    E[l] = X[l] ^ Y[l];
                    adj[X[l]].push_back(l);
                    adj[Y[l]].push_back(l);
                }
                memset(tin, -1, sizeof tin);
                for(int l = 1; l <= N; l++)
                    if(tin[l] == -1) dfs(l, -1);
                for(int l = 1; l <= M; l++) {
                    if(!isBridge[l]) unionSet(X[l], Y[l]);
                }
                for(int l = 1; l <= N; l++) adj[l].clear();
                for(int l = 1; l <= M; l++) {
                    if(!isBridge[l]) continue;
                    X[l] = findSet(X[l]);
                    Y[l] = findSet(Y[l]);
                    E[l] = X[l] ^ Y[l];
                    adj[X[l]].push_back(l);
                    adj[Y[l]].push_back(l);
                }
                cin >> Q;
                while(Q--) {
                    int U, V; cin >> U >> V;
                    U = findSet(U), V = findSet(V);
                    S[U]++, S[V]--;
                }
                for(int l = 1; l <= N; l++) {
                    if(P[l] == l && !dep[l]) {
                        dep[l] = 1; solve(l, l);
                    }
                }
                for(int l = 1; l <= M; l++) {
                    if(!isBridge[l]) { cout << 'B'; continue; }
                    int U = X[l], V = Y[l];
                    if(dep[U] < dep[V]) swap(U, V);
                    if(S[U]) cout << (((S[U] > 0) == (U == X[l])) ? 'R' : 'L');
                    else cout << 'B';
                }
                return 0;
            }

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3044 KB Output is correct
2 Correct 2 ms 3068 KB Output is correct
3 Correct 2 ms 3064 KB Output is correct
4 Correct 2 ms 3068 KB Output is correct
5 Correct 2 ms 3200 KB Output is correct
6 Correct 3 ms 3072 KB Output is correct
7 Correct 2 ms 3156 KB Output is correct
8 Correct 2 ms 3156 KB Output is correct
9 Correct 3 ms 3064 KB Output is correct
10 Correct 3 ms 3064 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3044 KB Output is correct
2 Correct 2 ms 3068 KB Output is correct
3 Correct 2 ms 3064 KB Output is correct
4 Correct 2 ms 3068 KB Output is correct
5 Correct 2 ms 3200 KB Output is correct
6 Correct 3 ms 3072 KB Output is correct
7 Correct 2 ms 3156 KB Output is correct
8 Correct 2 ms 3156 KB Output is correct
9 Correct 3 ms 3064 KB Output is correct
10 Correct 3 ms 3064 KB Output is correct
11 Correct 40 ms 8556 KB Output is correct
12 Correct 42 ms 9736 KB Output is correct
13 Correct 35 ms 11192 KB Output is correct
14 Correct 43 ms 12176 KB Output is correct
15 Correct 45 ms 12404 KB Output is correct
16 Correct 54 ms 10380 KB Output is correct
17 Correct 48 ms 12288 KB Output is correct
18 Correct 52 ms 10300 KB Output is correct
19 Correct 57 ms 13588 KB Output is correct
20 Correct 46 ms 9364 KB Output is correct
21 Correct 38 ms 9380 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3044 KB Output is correct
2 Correct 2 ms 3068 KB Output is correct
3 Correct 2 ms 3064 KB Output is correct
4 Correct 2 ms 3068 KB Output is correct
5 Correct 2 ms 3200 KB Output is correct
6 Correct 3 ms 3072 KB Output is correct
7 Correct 2 ms 3156 KB Output is correct
8 Correct 2 ms 3156 KB Output is correct
9 Correct 3 ms 3064 KB Output is correct
10 Correct 3 ms 3064 KB Output is correct
11 Correct 40 ms 8556 KB Output is correct
12 Correct 42 ms 9736 KB Output is correct
13 Correct 35 ms 11192 KB Output is correct
14 Correct 43 ms 12176 KB Output is correct
15 Correct 45 ms 12404 KB Output is correct
16 Correct 54 ms 10380 KB Output is correct
17 Correct 48 ms 12288 KB Output is correct
18 Correct 52 ms 10300 KB Output is correct
19 Correct 57 ms 13588 KB Output is correct
20 Correct 46 ms 9364 KB Output is correct
21 Correct 38 ms 9380 KB Output is correct
22 Correct 55 ms 13476 KB Output is correct
23 Correct 56 ms 11436 KB Output is correct
24 Correct 83 ms 11556 KB Output is correct
25 Correct 69 ms 17036 KB Output is correct
26 Correct 57 ms 12984 KB Output is correct
27 Correct 57 ms 11652 KB Output is correct
28 Correct 23 ms 6604 KB Output is correct
29 Correct 46 ms 9968 KB Output is correct
30 Correct 47 ms 10440 KB Output is correct
31 Correct 59 ms 10528 KB Output is correct
32 Correct 61 ms 13388 KB Output is correct