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답안 #90800

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
90800 2018-12-24T13:08:14 Z FutymyClone 007 (CEOI14_007) C++14
0 / 100
 299 ms 18396 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = 2e5 + 5;

int n, m, s, d, a, b, ans1 = 0, ans2 = 0, d1[N], d2[N], d3[N], d4[N];
vector <int> g[N];

void bfs1(){
    memset(d1, 0x3f, sizeof(d1)); queue <int> q;
    d1[a] = 0; q.push(a);
    while (!q.empty()) {
        int u = q.front(); q.pop();
        for (auto v: g[u]) {
            if (d1[v] > 1e9) {
                d1[v] = d1[u] + 1;
                q.push(v);
            }
        }
    }
}

void bfs2(){
    memset(d2, 0x3f, sizeof(d2)); queue <int> q;
    d2[b] = 0; q.push(b);
    while (!q.empty()) {
        int u = q.front(); q.pop();
        for (auto v: g[u]) {
            if (d2[v] > 1e9) {
                d2[v] = d2[u] + 1;
                q.push(v);
            }
        }
    }
}

void bfs3(){
    memset(d3, 0x3f, sizeof(d3));
    queue <int> q; q.push(s); d3[s] = 0;
    while (!q.empty()) {
        int u = q.front(); q.pop();
        ans1 = max(ans1, d3[u]);
        for (auto v: g[u]) {
            if (d3[v] > 1e9 && (d1[v] == d1[u] - 1 || d2[v] == d2[u] - 1)) {
                d3[v] = d3[u] + 1;
                q.push(v);
            }
        }
    }
}

void bfs4(){
    memset(d4, 0x3f, sizeof(d4));
    queue <int> q; q.push(d); d4[d] = 0;
    while (!q.empty()) {
        int u = q.front(); q.pop();
        ans2 = max(ans2, d4[u]);
        for (auto v: g[u]) {
            if (d4[v] > 1e9 && (d1[v] == d1[u] - 1 && d2[v] == d2[u] - 1)) {
                d4[v] = d4[u] + 1;
                q.push(v);
            }
        }
    }
}

int main(){
    scanf("%d %d", &n, &m);
    scanf("%d %d %d %d", &s, &d, &a, &b);
    for (int i = 1; i <= m; i++) {
        int u, v;
        scanf("%d %d", &u, &v);
        g[u].push_back(v); g[v].push_back(u);
    }

    bfs1(); bfs2();
    if (d1[d] - d1[s] != d2[d] - d2[s]) printf("%d", max(min(d1[d] - d1[s], d2[d] - d2[s]), -1));
    else {
        bfs3(); bfs4();
        printf("%d", max(d1[d] - d1[s] - ((d1[d] - d1[s] + ans1) < ans2), -1));
    }
    return 0;
}
/*
6 6
1 2 3 4
1 5
5 6
6 3
6 4
1 2
3 4

6 7
5 6 1 2
6 3
1 2
1 3
2 3
1 5
2 4
5 4
*/

Compilation message

007.cpp: In function 'int main()':
007.cpp:69:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~~
007.cpp:70:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d %d %d", &s, &d, &a, &b);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
007.cpp:73:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &u, &v);
         ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
0.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 6648 KB Output is correct
2 Correct 7 ms 8188 KB Output is correct
3 Correct 7 ms 8304 KB Output is correct
4 Incorrect 7 ms 8368 KB Output isn't correct
5 Incorrect 7 ms 8368 KB Output isn't correct
6 Correct 7 ms 8368 KB Output is correct
7 Correct 7 ms 8468 KB Output is correct
8 Incorrect 7 ms 8488 KB Output isn't correct
9 Correct 7 ms 8488 KB Output is correct
10 Correct 6 ms 8488 KB Output is correct
11 Correct 6 ms 8488 KB Output is correct
12 Incorrect 8 ms 8548 KB Output isn't correct
13 Correct 8 ms 8548 KB Output is correct
14 Incorrect 8 ms 8548 KB Output isn't correct
15 Correct 8 ms 8548 KB Output is correct
16 Incorrect 8 ms 8548 KB Output isn't correct
17 Incorrect 8 ms 8548 KB Output isn't correct
18 Incorrect 8 ms 8548 KB Output isn't correct
19 Correct 8 ms 8548 KB Output is correct
20 Correct 9 ms 8548 KB Output is correct
21 Correct 6 ms 8548 KB Output is correct
22 Correct 8 ms 8548 KB Output is correct
23 Correct 8 ms 8548 KB Output is correct
24 Incorrect 8 ms 8548 KB Output isn't correct

Subtask #2
0.0 / 70.0

# 결과 실행 시간 메모리 Grader output
1 Correct 27 ms 9724 KB Output is correct
2 Incorrect 36 ms 10236 KB Output isn't correct
3 Correct 30 ms 10236 KB Output is correct
4 Incorrect 37 ms 10364 KB Output isn't correct
5 Correct 27 ms 10364 KB Output is correct
6 Correct 28 ms 10364 KB Output is correct
7 Correct 31 ms 10364 KB Output is correct
8 Correct 33 ms 10364 KB Output is correct
9 Incorrect 47 ms 10364 KB Output isn't correct
10 Correct 175 ms 14588 KB Output is correct
11 Incorrect 61 ms 14588 KB Output isn't correct
12 Correct 68 ms 14588 KB Output is correct
13 Incorrect 55 ms 14588 KB Output isn't correct
14 Correct 55 ms 14588 KB Output is correct
15 Correct 65 ms 14588 KB Output is correct
16 Correct 65 ms 14588 KB Output is correct
17 Correct 58 ms 14588 KB Output is correct
18 Incorrect 65 ms 14588 KB Output isn't correct
19 Correct 126 ms 14588 KB Output is correct
20 Incorrect 228 ms 15740 KB Output isn't correct
21 Incorrect 111 ms 15740 KB Output isn't correct
22 Correct 84 ms 15740 KB Output is correct
23 Correct 115 ms 15740 KB Output is correct
24 Correct 113 ms 15740 KB Output is correct
25 Incorrect 105 ms 15740 KB Output isn't correct
26 Correct 97 ms 15740 KB Output is correct
27 Correct 93 ms 15740 KB Output is correct
28 Correct 106 ms 15740 KB Output is correct
29 Correct 145 ms 15740 KB Output is correct
30 Incorrect 211 ms 16252 KB Output isn't correct
31 Incorrect 111 ms 16252 KB Output isn't correct
32 Correct 106 ms 16252 KB Output is correct
33 Correct 96 ms 16252 KB Output is correct
34 Incorrect 108 ms 16252 KB Output isn't correct
35 Incorrect 105 ms 16252 KB Output isn't correct
36 Incorrect 105 ms 16252 KB Output isn't correct
37 Correct 137 ms 16252 KB Output is correct
38 Correct 126 ms 16252 KB Output is correct
39 Correct 144 ms 16252 KB Output is correct
40 Incorrect 197 ms 16252 KB Output isn't correct
41 Correct 299 ms 18396 KB Output is correct