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Submission #490318

# Submission time Handle Problem Language Result Execution time Memory
490318 2021-11-27T01:23:34 Z SirCovidThe19th 007 (CEOI14_007) C++17
100 / 100
 407 ms 16208 KB 
#include <bits/stdc++.h>
using namespace std;

const int mx = 2e5 + 5;

int n, m, s, v, a, b, dA[mx], dB[mx], ans; vector<int> adj[mx];

void bfs(int st, int *D){
    queue<int> Q; fill(D, D + n + 1, -1); 
    Q.push(st); D[st] = 0;
    while (!Q.empty()){
        int i = Q.front(); Q.pop();
        for (int j : adj[i]) if (D[j] == -1) D[j] = D[i] + 1, Q.push(j);
    }
}
int nearer(int pos){
    int d = 0;
    while (1){
        bool ok = 0;
        for (int i : adj[pos]) if (dA[i] < dA[pos] and dB[i] < dB[pos]){
            pos = i; ok = 1; d++; 
            break;
        }
        if (!ok) break;
    }
    return d;
}

int main(){
    cin >> n >> m >> s >> v >> a >> b;
    for (int i = 1; i <= m; i++){
        int a, b; cin >> a >> b;
        adj[a].push_back(b); adj[b].push_back(a);
    }
    bfs(a, dA); bfs(b, dB);
    int wA = dA[v] - dA[s], wB = dB[v] - dB[s];

    if (wA == wB) ans = (nearer(s) >= nearer(v) - wA) ? wA : wA - 1;
    else ans = min(wA, wB);

    cout<<max(ans, -1)<<endl;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 2 ms 4940 KB Output is correct
3 Correct 3 ms 5000 KB Output is correct
4 Correct 3 ms 4996 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 4940 KB Output is correct
7 Correct 3 ms 4940 KB Output is correct
8 Correct 2 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 3 ms 4940 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 5000 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 3 ms 4944 KB Output is correct
16 Correct 3 ms 4948 KB Output is correct
17 Correct 3 ms 4940 KB Output is correct
18 Correct 4 ms 4940 KB Output is correct
19 Correct 3 ms 4996 KB Output is correct
20 Correct 3 ms 4940 KB Output is correct
21 Correct 3 ms 4940 KB Output is correct
22 Correct 3 ms 4940 KB Output is correct
23 Correct 3 ms 4944 KB Output is correct
24 Correct 3 ms 4944 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 40 ms 6596 KB Output is correct
2 Correct 53 ms 7376 KB Output is correct
3 Correct 34 ms 6768 KB Output is correct
4 Correct 46 ms 7512 KB Output is correct
5 Correct 31 ms 6548 KB Output is correct
6 Correct 33 ms 6732 KB Output is correct
7 Correct 36 ms 6940 KB Output is correct
8 Correct 38 ms 6952 KB Output is correct
9 Correct 57 ms 7364 KB Output is correct
10 Correct 279 ms 11652 KB Output is correct
11 Correct 69 ms 8572 KB Output is correct
12 Correct 93 ms 9436 KB Output is correct
13 Correct 80 ms 8832 KB Output is correct
14 Correct 64 ms 8232 KB Output is correct
15 Correct 93 ms 9592 KB Output is correct
16 Correct 93 ms 9796 KB Output is correct
17 Correct 83 ms 9280 KB Output is correct
18 Correct 91 ms 9224 KB Output is correct
19 Correct 145 ms 10472 KB Output is correct
20 Correct 311 ms 13428 KB Output is correct
21 Correct 136 ms 11240 KB Output is correct
22 Correct 115 ms 10412 KB Output is correct
23 Correct 127 ms 11140 KB Output is correct
24 Correct 137 ms 11304 KB Output is correct
25 Correct 120 ms 10836 KB Output is correct
26 Correct 111 ms 10560 KB Output is correct
27 Correct 147 ms 11204 KB Output is correct
28 Correct 141 ms 11292 KB Output is correct
29 Correct 193 ms 11948 KB Output is correct
30 Correct 321 ms 13932 KB Output is correct
31 Correct 149 ms 12220 KB Output is correct
32 Correct 144 ms 11376 KB Output is correct
33 Correct 140 ms 11440 KB Output is correct
34 Correct 146 ms 11760 KB Output is correct
35 Correct 155 ms 11420 KB Output is correct
36 Correct 146 ms 11852 KB Output is correct
37 Correct 160 ms 12636 KB Output is correct
38 Correct 176 ms 12496 KB Output is correct
39 Correct 198 ms 12484 KB Output is correct
40 Correct 293 ms 14012 KB Output is correct
41 Correct 407 ms 16208 KB Output is correct