oj.uz

Submission #82431

# Submission time Handle Problem Language Result Execution time Memory
82431 2018-10-30T15:30:12 Z atoiz 007 (CEOI14_007) C++14
90 / 100
 286 ms 18268 KB 
#include <iostream>
#include <vector>
#include <algorithm>
#include <cstdio>
#include <cmath>
#include <cstring>
#include <string>
#include <cassert>
#include <climits>
#include <fstream>
#include <stack>
#include <queue>
#include <map>

using namespace std;

const string FILE_NAME = "spy";
const string IN_FILE = FILE_NAME + ".inp";
const string OUT_FILE = FILE_NAME + ".out";

int readInt()
{
    char ch = getchar(); int ans = 0, sgn = 1;
    while (ch == ' ' || ch == '\n') ch = getchar();
    if (ch == '-') sgn = -1, ch = getchar();
    while (47 < ch && ch < 58) ans = ans * 10 + ch - 48, ch = getchar();
    return ans * sgn;
}

const int INF = 1e8;
const int MAX = 200010;
int n, m;
int s, d, a, b;
vector< vector<int> > dist(3, vector<int>(MAX, INF));
vector<int> deci(MAX, INF);
vector<int> gr[MAX];

int32_t main()
{
//	freopen(IN_FILE.c_str(), "r", stdin);
//	freopen(OUT_FILE.c_str(), "w", stdout);

	n = readInt(); m = readInt();
	s = readInt(); d = readInt(); a = readInt(); b = readInt();
    for (int i = 0; i < m; ++i) {
		int u = readInt(), v = readInt();
        gr[u].push_back(v);
        gr[v].push_back(u);
    }


	dist[0][a] = 0;
	queue<int> qu; qu.push(a);
    while (!qu.empty()) {
        int u = qu.front(); qu.pop();
        for (int v : gr[u]) {
            if (dist[0][v] == INF) {
                dist[0][v] = dist[0][u] + 1;
                qu.push(v);
            }
        }
    }

	dist[1][b] = 0;
	assert(qu.empty());
	qu.push(b);
    while (!qu.empty()) {
        int u = qu.front(); qu.pop();
        for (int v : gr[u]) {
            if (dist[1][v] == INF) {
                dist[1][v] = dist[1][u] + 1;
                qu.push(v);
            }
        }

        deci[u] = min(dist[0][u], dist[1][u]);
        for (int v : gr[u]) {
            if (dist[0][v] + 1 == dist[0][u] && dist[1][v] + 1 == dist[1][u]) {
                deci[u] = min(deci[u], deci[v]);
            }
        }
    }

	dist[2][d] = 0;
	assert(qu.empty());
	qu.push(d);
    while (!qu.empty()) {
        int u = qu.front(); qu.pop();
        for (int v : gr[u]) {
            if (dist[2][v] == INF) {
                dist[2][v] = dist[2][u] + 1;
                qu.push(v);
            }
        }
    }

	int ans = INF;

	for (int u = 1; u <= n; ++u) {
        bool block;
        if (dist[0][s] > dist[0][u]) block = 0;
        else if (dist[0][s] < dist[0][u]) block = 1;
        else if (dist[1][s] > dist[1][u]) block = 0;
        else if (dist[1][s] < dist[1][u]) block = 1;
        else if (deci[s] <= deci[u]) block = 1;
        else block = 0;

        if (u == d && (!block)) {
            cout << -1;
            return 0;
        }
        if (!block) {
            ans = min(ans, dist[2][u] - 1);
        }
	}
	cout << ans;
}

Subtask #1
20.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 8168 KB Output is correct
2 Correct 9 ms 8296 KB Output is correct
3 Correct 9 ms 8296 KB Output is correct
4 Correct 9 ms 8296 KB Output is correct
5 Correct 9 ms 8296 KB Output is correct
6 Correct 9 ms 8304 KB Output is correct
7 Correct 9 ms 8316 KB Output is correct
8 Correct 10 ms 8340 KB Output is correct
9 Correct 9 ms 8368 KB Output is correct
10 Correct 9 ms 8540 KB Output is correct
11 Correct 9 ms 8540 KB Output is correct
12 Correct 9 ms 8540 KB Output is correct
13 Correct 9 ms 8540 KB Output is correct
14 Correct 9 ms 8540 KB Output is correct
15 Correct 9 ms 8540 KB Output is correct
16 Correct 9 ms 8540 KB Output is correct
17 Correct 9 ms 8540 KB Output is correct
18 Correct 10 ms 8540 KB Output is correct
19 Correct 9 ms 8540 KB Output is correct
20 Correct 10 ms 8540 KB Output is correct
21 Incorrect 9 ms 8540 KB Output isn't correct
22 Correct 11 ms 8540 KB Output is correct
23 Correct 9 ms 8540 KB Output is correct
24 Correct 9 ms 8540 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 26 ms 9704 KB Output is correct
2 Correct 31 ms 10220 KB Output is correct
3 Correct 34 ms 10220 KB Output is correct
4 Correct 33 ms 10312 KB Output is correct
5 Correct 31 ms 10312 KB Output is correct
6 Correct 26 ms 10312 KB Output is correct
7 Correct 28 ms 10312 KB Output is correct
8 Correct 43 ms 10312 KB Output is correct
9 Correct 44 ms 10344 KB Output is correct
10 Correct 135 ms 14568 KB Output is correct
11 Correct 57 ms 14568 KB Output is correct
12 Correct 71 ms 14568 KB Output is correct
13 Correct 62 ms 14568 KB Output is correct
14 Correct 48 ms 14568 KB Output is correct
15 Correct 63 ms 14568 KB Output is correct
16 Correct 70 ms 14568 KB Output is correct
17 Correct 62 ms 14568 KB Output is correct
18 Correct 75 ms 14568 KB Output is correct
19 Correct 97 ms 14568 KB Output is correct
20 Correct 197 ms 15980 KB Output is correct
21 Correct 103 ms 15980 KB Output is correct
22 Correct 103 ms 15980 KB Output is correct
23 Correct 93 ms 15980 KB Output is correct
24 Correct 93 ms 15980 KB Output is correct
25 Correct 107 ms 15980 KB Output is correct
26 Correct 78 ms 15980 KB Output is correct
27 Correct 96 ms 15980 KB Output is correct
28 Correct 141 ms 15980 KB Output is correct
29 Correct 157 ms 15980 KB Output is correct
30 Correct 207 ms 16232 KB Output is correct
31 Correct 117 ms 16232 KB Output is correct
32 Correct 114 ms 16232 KB Output is correct
33 Correct 131 ms 16232 KB Output is correct
34 Correct 141 ms 16232 KB Output is correct
35 Correct 101 ms 16232 KB Output is correct
36 Correct 126 ms 16232 KB Output is correct
37 Correct 118 ms 16232 KB Output is correct
38 Correct 129 ms 16232 KB Output is correct
39 Correct 162 ms 16232 KB Output is correct
40 Correct 193 ms 16232 KB Output is correct
41 Correct 286 ms 18268 KB Output is correct