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Submission #379803

# Submission time Handle Problem Language Result Execution time Memory
379803 2021-03-19T10:45:31 Z MladenP One-Way Streets (CEOI17_oneway) C++17
100 / 100
 90 ms 14188 KB 
#include <bits/stdc++.h>
#define pii pair<int, int>
#define fi first
#define se second
#define pb push_back
#define PRINT(x) cerr<<#x<<'='<<x<<endl;
#define MAXN 100010
using namespace std;
int N, M, P, w[MAXN], fup[MAXN], dub[MAXN];
vector<pii> adj[MAXN];
pii edge[MAXN];
string s = "#";
void dfs(int node, int e) {
    dub[node] = dub[node^edge[e].fi^edge[e].se]+1;
    fup[node] = dub[node];
    for(auto x : adj[node]) {
        if(x.se == e) continue;
        if(dub[x.fi]) {
            fup[node] = min(fup[node], dub[x.fi]);
        } else {
            dfs(x.fi, x.se);
            w[node] += w[x.fi];
            fup[node] = min(fup[node], fup[x.fi]);
        }
    }
    if(fup[node] != dub[node]) return;
    if(w[node] > 0) {
        int node1 = node^edge[e].fi^edge[e].se;
        if(make_pair(node1, node) == edge[e]) s[e] = 'L';
        else s[e] = 'R';
    } else if(w[node] < 0) {
        int node1 = node^edge[e].fi^edge[e].se;
        if(make_pair(node1, node) == edge[e]) s[e] = 'R';
        else s[e] = 'L';
    }
}
int main() {
    ios::sync_with_stdio(false); cin.tie(0);
    cin >> N >> M;
    for(int i = 1; i <= M; i++) {
        int A, B; cin >> A >> B;
        edge[i] = {A, B};
        adj[A].pb({B, i});
        adj[B].pb({A, i});
        s += "B";
    }
    edge[0] = {1, 0};
    cin >> P;
    for(int i = 1; i <= P; i++) {
        int X, Y; cin >> X >> Y;
        w[X]++; w[Y]--;
    }
    for(int i = 1; i <= N; i++) {
        if(!dub[i]) {
            edge[0] = {i, 0};
            dfs(i, 0);
        }
    }
    for(int i = 1; i <= M; i++) cout << s[i];
    return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2668 KB Output is correct
2 Correct 2 ms 2668 KB Output is correct
3 Correct 3 ms 2796 KB Output is correct
4 Correct 2 ms 2796 KB Output is correct
5 Correct 3 ms 2796 KB Output is correct
6 Correct 2 ms 2796 KB Output is correct
7 Correct 3 ms 2816 KB Output is correct
8 Correct 2 ms 2796 KB Output is correct
9 Correct 2 ms 2796 KB Output is correct
10 Correct 3 ms 2796 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2668 KB Output is correct
2 Correct 2 ms 2668 KB Output is correct
3 Correct 3 ms 2796 KB Output is correct
4 Correct 2 ms 2796 KB Output is correct
5 Correct 3 ms 2796 KB Output is correct
6 Correct 2 ms 2796 KB Output is correct
7 Correct 3 ms 2816 KB Output is correct
8 Correct 2 ms 2796 KB Output is correct
9 Correct 2 ms 2796 KB Output is correct
10 Correct 3 ms 2796 KB Output is correct
11 Correct 52 ms 8300 KB Output is correct
12 Correct 53 ms 9196 KB Output is correct
13 Correct 70 ms 10360 KB Output is correct
14 Correct 63 ms 10988 KB Output is correct
15 Correct 65 ms 10988 KB Output is correct
16 Correct 67 ms 8684 KB Output is correct
17 Correct 55 ms 10732 KB Output is correct
18 Correct 70 ms 8812 KB Output is correct
19 Correct 55 ms 11884 KB Output is correct
20 Correct 46 ms 8684 KB Output is correct
21 Correct 46 ms 8428 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2668 KB Output is correct
2 Correct 2 ms 2668 KB Output is correct
3 Correct 3 ms 2796 KB Output is correct
4 Correct 2 ms 2796 KB Output is correct
5 Correct 3 ms 2796 KB Output is correct
6 Correct 2 ms 2796 KB Output is correct
7 Correct 3 ms 2816 KB Output is correct
8 Correct 2 ms 2796 KB Output is correct
9 Correct 2 ms 2796 KB Output is correct
10 Correct 3 ms 2796 KB Output is correct
11 Correct 52 ms 8300 KB Output is correct
12 Correct 53 ms 9196 KB Output is correct
13 Correct 70 ms 10360 KB Output is correct
14 Correct 63 ms 10988 KB Output is correct
15 Correct 65 ms 10988 KB Output is correct
16 Correct 67 ms 8684 KB Output is correct
17 Correct 55 ms 10732 KB Output is correct
18 Correct 70 ms 8812 KB Output is correct
19 Correct 55 ms 11884 KB Output is correct
20 Correct 46 ms 8684 KB Output is correct
21 Correct 46 ms 8428 KB Output is correct
22 Correct 72 ms 10624 KB Output is correct
23 Correct 77 ms 8684 KB Output is correct
24 Correct 90 ms 8708 KB Output is correct
25 Correct 74 ms 14188 KB Output is correct
26 Correct 70 ms 10092 KB Output is correct
27 Correct 72 ms 8812 KB Output is correct
28 Correct 38 ms 5996 KB Output is correct
29 Correct 63 ms 8172 KB Output is correct
30 Correct 68 ms 8376 KB Output is correct
31 Correct 77 ms 8812 KB Output is correct
32 Correct 66 ms 10988 KB Output is correct