oj.uz

Submission #668570

# Submission time Handle Problem Language Result Execution time Memory
668570 2022-12-04T06:53:55 Z RambaXGorilla 007 (CEOI14_007) C++17
100 / 100
 301 ms 16444 KB 
#include<cstdio>
#include<algorithm>
#include<utility>
#include<vector>
#include<queue>
using namespace std;
typedef pair <int,int> ii;
int N, M, S, D, A, B;
vector <int> adj[200010];
queue <ii> near;
int dists[2][200010] = {};
bool vis[200010] = {};
void bfs(int X, int n){
    near.push(ii(X, 0));
    while(!near.empty()){
        int node = near.front().first;
        int dist = near.front().second;
        near.pop();
        if(dists[n][node]) continue;
        dists[n][node] = dist;
        for(int i : adj[node]){
            near.push(ii(i, dist + 1));
        }
    }
}
int both(int X){
    int most;
    near.push(ii(X, 0));
    while(!near.empty()){
        int node = near.front().first;
        int dist = near.front().second;
        near.pop();
        if(vis[node] || dists[0][X] - dists[0][node] != dist || dists[1][X] - dists[1][node] != dist) continue;
        vis[node] = true;
        most = dist;
        for(int i : adj[node]){
            near.push(ii(i, dist + 1));
        }
    }
    fill(vis, vis + 200010, false);
    return most;
}
int main(){
    scanf("%d%d%d%d%d%d",&N,&M,&S,&D,&A,&B);
    for(int i = 0;i < M;i++){
        int a, b;
        scanf("%d%d",&a,&b);
        adj[a].push_back(b);
        adj[b].push_back(a);
    }
    bfs(A, 0);
    bfs(B, 1);
    int diff1 = dists[0][D] - dists[0][S];
    int diff2 = dists[1][D] - dists[1][S];
    int ideal = max(min(diff1, diff2), -1);
    if(diff1 != diff2) printf("%d",ideal);
    else printf("%d",ideal - (ideal + both(S) < both(D)));
}

Compilation message

007.cpp: In function 'int main()':
007.cpp:44:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |     scanf("%d%d%d%d%d%d",&N,&M,&S,&D,&A,&B);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
007.cpp:47:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |         scanf("%d%d",&a,&b);
      |         ~~~~~^~~~~~~~~~~~~~
007.cpp: In function 'int both(int)':
007.cpp:41:12: warning: 'most' may be used uninitialized in this function [-Wmaybe-uninitialized]
   41 |     return most;
      |            ^~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 5076 KB Output is correct
3 Correct 3 ms 5076 KB Output is correct
4 Correct 2 ms 5204 KB Output is correct
5 Correct 3 ms 5076 KB Output is correct
6 Correct 2 ms 5076 KB Output is correct
7 Correct 3 ms 5076 KB Output is correct
8 Correct 3 ms 5076 KB Output is correct
9 Correct 3 ms 5076 KB Output is correct
10 Correct 2 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 3 ms 5204 KB Output is correct
13 Correct 3 ms 5204 KB Output is correct
14 Correct 4 ms 5204 KB Output is correct
15 Correct 3 ms 5204 KB Output is correct
16 Correct 3 ms 5204 KB Output is correct
17 Correct 3 ms 5204 KB Output is correct
18 Correct 3 ms 5204 KB Output is correct
19 Correct 3 ms 5204 KB Output is correct
20 Correct 3 ms 5204 KB Output is correct
21 Correct 3 ms 4948 KB Output is correct
22 Correct 3 ms 5204 KB Output is correct
23 Correct 3 ms 5204 KB Output is correct
24 Correct 3 ms 5240 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 6784 KB Output is correct
2 Correct 30 ms 7496 KB Output is correct
3 Correct 20 ms 6796 KB Output is correct
4 Correct 24 ms 7508 KB Output is correct
5 Correct 18 ms 6436 KB Output is correct
6 Correct 24 ms 6740 KB Output is correct
7 Correct 24 ms 7044 KB Output is correct
8 Correct 21 ms 7012 KB Output is correct
9 Correct 36 ms 7500 KB Output is correct
10 Correct 159 ms 11944 KB Output is correct
11 Correct 41 ms 8644 KB Output is correct
12 Correct 57 ms 9596 KB Output is correct
13 Correct 44 ms 8932 KB Output is correct
14 Correct 39 ms 8396 KB Output is correct
15 Correct 51 ms 9640 KB Output is correct
16 Correct 54 ms 9712 KB Output is correct
17 Correct 48 ms 9424 KB Output is correct
18 Correct 54 ms 9404 KB Output is correct
19 Correct 112 ms 10620 KB Output is correct
20 Correct 190 ms 13408 KB Output is correct
21 Correct 73 ms 11476 KB Output is correct
22 Correct 75 ms 10572 KB Output is correct
23 Correct 76 ms 11304 KB Output is correct
24 Correct 71 ms 11224 KB Output is correct
25 Correct 72 ms 10996 KB Output is correct
26 Correct 66 ms 10576 KB Output is correct
27 Correct 88 ms 11420 KB Output is correct
28 Correct 78 ms 11456 KB Output is correct
29 Correct 130 ms 11980 KB Output is correct
30 Correct 208 ms 14000 KB Output is correct
31 Correct 111 ms 12496 KB Output is correct
32 Correct 84 ms 11336 KB Output is correct
33 Correct 80 ms 11528 KB Output is correct
34 Correct 86 ms 11808 KB Output is correct
35 Correct 79 ms 11596 KB Output is correct
36 Correct 83 ms 11840 KB Output is correct
37 Correct 99 ms 12512 KB Output is correct
38 Correct 98 ms 12500 KB Output is correct
39 Correct 114 ms 12600 KB Output is correct
40 Correct 174 ms 14080 KB Output is correct
41 Correct 301 ms 16444 KB Output is correct