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Submission #627677

# Submission time Handle Problem Language Result Execution time Memory
627677 2022-08-12T18:25:13 Z MohamedFaresNebili One-Way Streets (CEOI17_oneway) C++14
100 / 100
 97 ms 19700 KB 
#include <bits/stdc++.h>

            using namespace std;

            using ll = long long;
            using ld = long double;
            using pi = pair<pair<int, int>, pair<int, int>>;

            #define ff first
            #define ss second
            #define pb push_back
            #define all(x) (x).begin(), (x).end()
            #define lb lower_bound
            #define int ll

            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 3448 KB Output is correct
2 Correct 2 ms 3412 KB Output is correct
3 Correct 2 ms 3600 KB Output is correct
4 Correct 3 ms 3540 KB Output is correct
5 Correct 2 ms 3540 KB Output is correct
6 Correct 2 ms 3584 KB Output is correct
7 Correct 3 ms 3584 KB Output is correct
8 Correct 2 ms 3584 KB Output is correct
9 Correct 2 ms 3456 KB Output is correct
10 Correct 2 ms 3452 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3448 KB Output is correct
2 Correct 2 ms 3412 KB Output is correct
3 Correct 2 ms 3600 KB Output is correct
4 Correct 3 ms 3540 KB Output is correct
5 Correct 2 ms 3540 KB Output is correct
6 Correct 2 ms 3584 KB Output is correct
7 Correct 3 ms 3584 KB Output is correct
8 Correct 2 ms 3584 KB Output is correct
9 Correct 2 ms 3456 KB Output is correct
10 Correct 2 ms 3452 KB Output is correct
11 Correct 40 ms 11172 KB Output is correct
12 Correct 45 ms 12408 KB Output is correct
13 Correct 69 ms 14212 KB Output is correct
14 Correct 73 ms 15624 KB Output is correct
15 Correct 60 ms 15828 KB Output is correct
16 Correct 69 ms 13896 KB Output is correct
17 Correct 64 ms 15468 KB Output is correct
18 Correct 85 ms 13904 KB Output is correct
19 Correct 54 ms 16624 KB Output is correct
20 Correct 45 ms 11852 KB Output is correct
21 Correct 38 ms 12432 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3448 KB Output is correct
2 Correct 2 ms 3412 KB Output is correct
3 Correct 2 ms 3600 KB Output is correct
4 Correct 3 ms 3540 KB Output is correct
5 Correct 2 ms 3540 KB Output is correct
6 Correct 2 ms 3584 KB Output is correct
7 Correct 3 ms 3584 KB Output is correct
8 Correct 2 ms 3584 KB Output is correct
9 Correct 2 ms 3456 KB Output is correct
10 Correct 2 ms 3452 KB Output is correct
11 Correct 40 ms 11172 KB Output is correct
12 Correct 45 ms 12408 KB Output is correct
13 Correct 69 ms 14212 KB Output is correct
14 Correct 73 ms 15624 KB Output is correct
15 Correct 60 ms 15828 KB Output is correct
16 Correct 69 ms 13896 KB Output is correct
17 Correct 64 ms 15468 KB Output is correct
18 Correct 85 ms 13904 KB Output is correct
19 Correct 54 ms 16624 KB Output is correct
20 Correct 45 ms 11852 KB Output is correct
21 Correct 38 ms 12432 KB Output is correct
22 Correct 97 ms 16640 KB Output is correct
23 Correct 78 ms 15104 KB Output is correct
24 Correct 95 ms 15132 KB Output is correct
25 Correct 80 ms 19700 KB Output is correct
26 Correct 78 ms 16288 KB Output is correct
27 Correct 77 ms 15288 KB Output is correct
28 Correct 30 ms 9104 KB Output is correct
29 Correct 63 ms 12692 KB Output is correct
30 Correct 75 ms 13216 KB Output is correct
31 Correct 71 ms 12976 KB Output is correct
32 Correct 59 ms 15968 KB Output is correct