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Submission #1005959

# Submission time Handle Problem Language Result Execution time Memory
1005959 2024-06-23T09:06:58 Z Essa2006 One-Way Streets (CEOI17_oneway) C++14
100 / 100
 359 ms 45892 KB 
#include <bits/stdc++.h>
using namespace std;
const int MAXN = 1e5;

vector<int> adj[MAXN+1];
map<pair<int,int>, int> edge, dir;
map<pair<int,int>, char> ans;
int dep[MAXN+1], low[MAXN+1], cntX[MAXN+1], cntY[MAXN+1];

void dfs(int v, int p) {
    dep[v] = low[v] = dep[p] + 1;
    for (int u : adj[v]) {
        if (u == p) continue;
        if (dep[u] == 0) {
            dfs(u, v);
            low[v] = min(low[v], low[u]);
            cntX[v] += cntX[u];
            cntY[v] += cntY[u];
        } else {
            low[v] = min(low[v], dep[u]);
        }
    }
    int node1 = v, node2 = p;
    if (cntX[v] == cntY[v] || dep[v] != low[v] || edge[{node1, node2}] != 1) return;

    if (!dir[{node1, node2}]) swap(node1, node2);
    pair<int,int> orient;
    if (cntX[v] > cntY[v]) {
        // edge should go from v -> p
        orient = {v, p};
    } else {
        orient = {p, v};
    }

    if (orient == make_pair(node1, node2)) {
        ans[{node1, node2}] = 'R';
    } else {
        ans[{node1, node2}] = 'L';
    }
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

    int n,m; cin >> n >> m;
    pair<int,int> graph[m];
    for (int i = 0; i < m; i++) {
        int a,b; cin >> a >> b;
        adj[a].push_back(b);
        adj[b].push_back(a);
        edge[{a, b}]++;
        edge[{b, a}]++;
        dir[{a, b}] = 1;
        graph[i] = {a, b};
    }
    int p; cin >> p;
    while (p--) {
        int x,y; cin >> x >> y;
        cntX[x]++, cntY[y]++;
    }

    for (int v = 1; v <= n; v++) {
        if (dep[v] == 0) {
            dfs(v,0);
        }
    }

    for (auto [a,b] : graph) {
        cout << (!ans.count({a,b}) ? 'B' : ans[{a,b}]);
    }
}

Compilation message

oneway.cpp: In function 'int main()':
oneway.cpp:70:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   70 |     for (auto [a,b] : graph) {
      |               ^

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4188 KB Output is correct
2 Correct 1 ms 4012 KB Output is correct
3 Correct 2 ms 4444 KB Output is correct
4 Correct 2 ms 4444 KB Output is correct
5 Correct 2 ms 4440 KB Output is correct
6 Correct 2 ms 4184 KB Output is correct
7 Correct 3 ms 4472 KB Output is correct
8 Correct 2 ms 4444 KB Output is correct
9 Correct 3 ms 4188 KB Output is correct
10 Correct 2 ms 4188 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4188 KB Output is correct
2 Correct 1 ms 4012 KB Output is correct
3 Correct 2 ms 4444 KB Output is correct
4 Correct 2 ms 4444 KB Output is correct
5 Correct 2 ms 4440 KB Output is correct
6 Correct 2 ms 4184 KB Output is correct
7 Correct 3 ms 4472 KB Output is correct
8 Correct 2 ms 4444 KB Output is correct
9 Correct 3 ms 4188 KB Output is correct
10 Correct 2 ms 4188 KB Output is correct
11 Correct 135 ms 28500 KB Output is correct
12 Correct 160 ms 29780 KB Output is correct
13 Correct 157 ms 30804 KB Output is correct
14 Correct 189 ms 31316 KB Output is correct
15 Correct 199 ms 31144 KB Output is correct
16 Correct 168 ms 28244 KB Output is correct
17 Correct 199 ms 34644 KB Output is correct
18 Correct 180 ms 28496 KB Output is correct
19 Correct 206 ms 36600 KB Output is correct
20 Correct 144 ms 29104 KB Output is correct
21 Correct 117 ms 27988 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4188 KB Output is correct
2 Correct 1 ms 4012 KB Output is correct
3 Correct 2 ms 4444 KB Output is correct
4 Correct 2 ms 4444 KB Output is correct
5 Correct 2 ms 4440 KB Output is correct
6 Correct 2 ms 4184 KB Output is correct
7 Correct 3 ms 4472 KB Output is correct
8 Correct 2 ms 4444 KB Output is correct
9 Correct 3 ms 4188 KB Output is correct
10 Correct 2 ms 4188 KB Output is correct
11 Correct 135 ms 28500 KB Output is correct
12 Correct 160 ms 29780 KB Output is correct
13 Correct 157 ms 30804 KB Output is correct
14 Correct 189 ms 31316 KB Output is correct
15 Correct 199 ms 31144 KB Output is correct
16 Correct 168 ms 28244 KB Output is correct
17 Correct 199 ms 34644 KB Output is correct
18 Correct 180 ms 28496 KB Output is correct
19 Correct 206 ms 36600 KB Output is correct
20 Correct 144 ms 29104 KB Output is correct
21 Correct 117 ms 27988 KB Output is correct
22 Correct 359 ms 41144 KB Output is correct
23 Correct 286 ms 38480 KB Output is correct
24 Correct 342 ms 38292 KB Output is correct
25 Correct 289 ms 45892 KB Output is correct
26 Correct 342 ms 40276 KB Output is correct
27 Correct 307 ms 38228 KB Output is correct
28 Correct 59 ms 8532 KB Output is correct
29 Correct 166 ms 29524 KB Output is correct
30 Correct 133 ms 29620 KB Output is correct
31 Correct 155 ms 30292 KB Output is correct
32 Correct 165 ms 31968 KB Output is correct