oj.uz

Submission #110779

# Submission time Handle Problem Language Result Execution time Memory
110779 2019-05-12T08:14:20 Z MAMBA 007 (CEOI14_007) C++17
30 / 100
 402 ms 42232 KB 
#include <bits/stdc++.h> 

using namespace std;

#define rep(i , j , k) for (int i = j; i < (int)k; i++)
#define pb push_back
#define mt make_tuple
#define for_all(x) x.begin(),x.end()

typedef long long ll;
typedef pair<int , int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef long double ld;
typedef complex<ld> point;

inline void fileIO(string s) {
	freopen((s + ".in").c_str(), "r", stdin);
	freopen((s + ".out").c_str(), "w", stdout);
}

template<class T , class S>
inline bool smin(T &a, S b) { return (T)b < a ? a = b , 1 : 0; }
template<class T , class S>
inline bool smax(T &a, S b) { return a < (T)b ? a = b , 1 : 0; }

constexpr int N = 1e6 + 10;

constexpr int MOD = 1e9 + 7;

template<typename T>
inline T mod(T &v) { return v = (v % MOD + MOD) % MOD; }
template<typename S, typename T>
inline S add(S &l, T r) { return mod(l += r); }

ll po(ll v, ll u) { return u ? po(v * v % MOD , u >> 1) * (u & 1 ? v : 1) % MOD : 1; }

int n , m;
int s , t , a , b, dist[N];
vector<int> adj[N];
int L , R , Q[N];

void bfs(int so) {
	memset(dist , -1, sizeof(dist));
	dist[so] = 0;
	L = 0, R = 1;
	Q[0] = so;
	while (L < R) {
		int me = Q[L++];
		for (auto e : adj[me])
			if (!~dist[e]) {
				dist[e] = dist[me] + 1;
				Q[R++] = e;
			}
	}
}

int arr[N];

void dfs(int v,  int col) {
	arr[v] += col;
	for (auto e : adj[v])
		if (dist[e] + 1 == dist[v] && arr[e] < col) 
			dfs(e , col);
}

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);

#ifndef LOCAL
	//	fileIO("forbidden1");
#endif


	cin >> n >> m >> s >> t >> a >> b;
	rep(i , 0 , m) {
		int u , v;
		cin >> u >> v;
		adj[u].pb(v);
		adj[v].pb(u);
	}

	bfs(s);
	int A = dist[a];
	int B = dist[b];

	dfs(a , 1);
	dfs(b , 2);

	int alpha = 0;
	rep(i , 0 , n + 1)
		if (arr[i] == 3)
			smax(alpha , dist[i]);

	bfs(t);
	int C = dist[a];
	int D = dist[b];

	memset(arr , 0 , sizeof(arr));
	dfs(a , 1);
	dfs(b , 2);

	int beta = 0;
	rep(i , 0 , n + 1)
		if (arr[i] == 3)
			smax(beta , dist[i]);



	int res = min(C - A , D - B);
	if (res < 0) return cout << -1 << endl, 0;

	if (A == B && C == D && alpha < beta)  
		res--;
	cout << res << endl;


	return 0;
}

Subtask #1
9.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 31 ms 31608 KB Output is correct
2 Correct 33 ms 31612 KB Output is correct
3 Correct 27 ms 31616 KB Output is correct
4 Correct 34 ms 31616 KB Output is correct
5 Correct 29 ms 31616 KB Output is correct
6 Partially correct 29 ms 31736 KB Partially correct
7 Partially correct 29 ms 31744 KB Partially correct
8 Correct 34 ms 31716 KB Output is correct
9 Partially correct 28 ms 31616 KB Partially correct
10 Correct 33 ms 31584 KB Output is correct
11 Correct 28 ms 31616 KB Output is correct
12 Correct 30 ms 31616 KB Output is correct
13 Partially correct 31 ms 31616 KB Partially correct
14 Correct 31 ms 31616 KB Output is correct
15 Partially correct 31 ms 31736 KB Partially correct
16 Correct 51 ms 31736 KB Output is correct
17 Correct 39 ms 31672 KB Output is correct
18 Correct 33 ms 31608 KB Output is correct
19 Partially correct 35 ms 31708 KB Partially correct
20 Partially correct 32 ms 31608 KB Partially correct
21 Correct 33 ms 31744 KB Output is correct
22 Partially correct 33 ms 31740 KB Partially correct
23 Partially correct 33 ms 31864 KB Partially correct
24 Correct 29 ms 31744 KB Output is correct

Subtask #2
21.0 / 70.0

# Verdict Execution time Memory Grader output
1 Partially correct 54 ms 33064 KB Partially correct
2 Correct 64 ms 34044 KB Output is correct
3 Partially correct 67 ms 33272 KB Partially correct
4 Correct 69 ms 34040 KB Output is correct
5 Correct 50 ms 33016 KB Output is correct
6 Correct 51 ms 33528 KB Output is correct
7 Partially correct 73 ms 33400 KB Partially correct
8 Correct 51 ms 33400 KB Output is correct
9 Correct 68 ms 33784 KB Output is correct
10 Partially correct 169 ms 38136 KB Partially correct
11 Correct 108 ms 34936 KB Output is correct
12 Partially correct 128 ms 35704 KB Partially correct
13 Correct 106 ms 35192 KB Output is correct
14 Correct 121 ms 34680 KB Output is correct
15 Partially correct 89 ms 35832 KB Partially correct
16 Correct 103 ms 35984 KB Output is correct
17 Correct 83 ms 35576 KB Output is correct
18 Correct 87 ms 35524 KB Output is correct
19 Partially correct 145 ms 36728 KB Partially correct
20 Correct 308 ms 39508 KB Output is correct
21 Correct 174 ms 38264 KB Output is correct
22 Partially correct 120 ms 36600 KB Partially correct
23 Correct 128 ms 37920 KB Output is correct
24 Partially correct 120 ms 37888 KB Partially correct
25 Correct 138 ms 36984 KB Output is correct
26 Correct 114 ms 36728 KB Output is correct
27 Correct 128 ms 37448 KB Output is correct
28 Correct 138 ms 37352 KB Output is correct
29 Partially correct 186 ms 38136 KB Partially correct
30 Correct 262 ms 40184 KB Output is correct
31 Correct 162 ms 39288 KB Output is correct
32 Partially correct 135 ms 37240 KB Partially correct
33 Correct 182 ms 37624 KB Output is correct
34 Correct 212 ms 37752 KB Output is correct
35 Correct 159 ms 38392 KB Output is correct
36 Correct 207 ms 38904 KB Output is correct
37 Correct 176 ms 38648 KB Output is correct
38 Correct 171 ms 38392 KB Output is correct
39 Correct 201 ms 38392 KB Output is correct
40 Correct 334 ms 40184 KB Output is correct
41 Partially correct 402 ms 42232 KB Partially correct