#include <bits/stdc++.h>
using namespace std;
#define pb push_back
const int maxn = 2e5;
int n, m;
vector<int> graph[1 + maxn];
int g, s, a, b;
vector<int> dg, ds, da, db;
vector<int> bfs(int start) {
vector<int> res(1 + n, -1);
res[start] = 0;
queue<int> q;
q.push(start);
while(!q.empty()) {
int cur = q.front();
q.pop();
for(int nei : graph[cur]) {
if(res[nei] == -1) {
res[nei] = res[cur] + 1;
q.push(nei);
}
}
}
return res;
}
void solve() {
cin >> n >> m;
cin >> g >> s >> a >> b;
for(int i = 0; i < m; i++) {
int x, y;
cin >> x >> y;
graph[x].pb(y);
graph[y].pb(x);
}
dg = bfs(g), ds = bfs(s), da = bfs(a), db = bfs(b);
if((da[s] < da[g]) || (db[s] < db[g])) {
cout << "-1\n";
return;
}
int add_a = da[s] - 1 - da[g], add_b = db[s] - 1 - db[g];
bool extra_case = true;
if(add_a != add_b) {
add_a++, add_b++;
extra_case = false;
}
int to_add = min(add_a, add_b);
if(!extra_case) {
cout << to_add << "\n";
return;
}
to_add++;
da[g] += to_add;
db[g] += to_add;
for(int i = 1; i <= n; i++) {
if(i != g) {
dg[i] += to_add;
}
}
int closest_g = n + 1, closest_s = n + 1;
if(da[s] != db[s] || da[g] != db[g]) {
//exit(1);
}
if(da[s] != da[g] || db[s] != db[g]) {
exit(1);
}
for(int cur = 1; cur <= n; cur++) {
/*int max_dab = max(da[cur], db[cur]), min_dab = min(da[cur], db[cur]);
if((max_dab + closest_g == max(da[g], db[g])) && (min_dab + closest_g == min(da[g], db[g]))) {
closest_g = min(closest_g, max_dab);
}
if((max_dab + closest_s == max(da[s], db[s]))) {
closest_s = min(closest_s, max_dab);
}*/
int max_dab = max(da[cur], db[cur]);
int min_dab = max(da[cur], db[cur]);
if(max_dab + dg[cur] == max(da[g], db[g])) {
if(min_dab + dg[cur] == min(da[g], db[g])) {
closest_g = min(closest_g, max_dab);
}
}
if(max_dab + ds[cur] == max(da[s], db[s])) {
if(min_dab + ds[cur] == min(da[s], db[s])) {
closest_s = min(closest_s, max_dab);
}
}
}
if(closest_s < closest_g) {
to_add--;
}
cout << to_add << "\n";
}
signed main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
solve();
return 0;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 2 |
Correct |
2 ms |
4940 KB |
Output is correct |
| 3 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 4 |
Correct |
2 ms |
4932 KB |
Output is correct |
| 5 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 6 |
Partially correct |
2 ms |
4948 KB |
Partially correct |
| 7 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 8 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 9 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 10 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 11 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 12 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 13 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 14 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 15 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 16 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 17 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 18 |
Correct |
3 ms |
5044 KB |
Output is correct |
| 19 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 20 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 21 |
Correct |
2 ms |
4948 KB |
Output is correct |
| 22 |
Partially correct |
2 ms |
4948 KB |
Partially correct |
| 23 |
Partially correct |
2 ms |
4948 KB |
Partially correct |
| 24 |
Correct |
3 ms |
4948 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
14 ms |
6868 KB |
Output is correct |
| 2 |
Correct |
18 ms |
7712 KB |
Output is correct |
| 3 |
Correct |
16 ms |
6952 KB |
Output is correct |
| 4 |
Correct |
19 ms |
7896 KB |
Output is correct |
| 5 |
Correct |
14 ms |
6784 KB |
Output is correct |
| 6 |
Correct |
13 ms |
7124 KB |
Output is correct |
| 7 |
Partially correct |
15 ms |
7312 KB |
Partially correct |
| 8 |
Correct |
16 ms |
7260 KB |
Output is correct |
| 9 |
Correct |
27 ms |
7756 KB |
Output is correct |
| 10 |
Correct |
87 ms |
12080 KB |
Output is correct |
| 11 |
Correct |
30 ms |
9240 KB |
Output is correct |
| 12 |
Correct |
48 ms |
10280 KB |
Output is correct |
| 13 |
Correct |
47 ms |
9608 KB |
Output is correct |
| 14 |
Correct |
25 ms |
8832 KB |
Output is correct |
| 15 |
Correct |
41 ms |
10404 KB |
Output is correct |
| 16 |
Correct |
36 ms |
10708 KB |
Output is correct |
| 17 |
Correct |
32 ms |
10068 KB |
Output is correct |
| 18 |
Correct |
51 ms |
10056 KB |
Output is correct |
| 19 |
Correct |
59 ms |
11300 KB |
Output is correct |
| 20 |
Correct |
122 ms |
14096 KB |
Output is correct |
| 21 |
Correct |
47 ms |
12460 KB |
Output is correct |
| 22 |
Correct |
70 ms |
11452 KB |
Output is correct |
| 23 |
Correct |
92 ms |
12384 KB |
Output is correct |
| 24 |
Correct |
51 ms |
12268 KB |
Output is correct |
| 25 |
Correct |
57 ms |
11916 KB |
Output is correct |
| 26 |
Correct |
42 ms |
11564 KB |
Output is correct |
| 27 |
Correct |
47 ms |
12528 KB |
Output is correct |
| 28 |
Correct |
88 ms |
12596 KB |
Output is correct |
| 29 |
Correct |
86 ms |
12960 KB |
Output is correct |
| 30 |
Correct |
154 ms |
14880 KB |
Output is correct |
| 31 |
Correct |
80 ms |
13684 KB |
Output is correct |
| 32 |
Correct |
77 ms |
12348 KB |
Output is correct |
| 33 |
Correct |
72 ms |
12624 KB |
Output is correct |
| 34 |
Correct |
86 ms |
12988 KB |
Output is correct |
| 35 |
Correct |
62 ms |
12704 KB |
Output is correct |
| 36 |
Correct |
56 ms |
13068 KB |
Output is correct |
| 37 |
Correct |
79 ms |
14160 KB |
Output is correct |
| 38 |
Correct |
97 ms |
13864 KB |
Output is correct |
| 39 |
Correct |
73 ms |
13940 KB |
Output is correct |
| 40 |
Correct |
147 ms |
15560 KB |
Output is correct |
| 41 |
Correct |
184 ms |
17552 KB |
Output is correct |
