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Submission #1105391

# Submission time Handle Problem Language Result Execution time Memory
1105391 2024-10-26T09:17:57 Z whoknow Hotspot (NOI17_hotspot) C++17
100 / 100
 685 ms 1604 KB 
#include <bits/stdc++.h>
#define ll long long
#define int long long
#define F first
#define S second
#define MAXN 5005
#define MAXEDGE 40005
#define ii pair<ll,int>
#define bit(i,j) ((i>>j)&1)
#define sz(i) (int)i.size()
#define endl '\n'
using namespace std;
int n, m, k;
vector<int>g[MAXN];
namespace sub1
{
double dp[MAXN];
ii d[MAXN][2];
bool visited[MAXN];
void bfs(int st, int j)
{
    for(int i = 0; i <= n; i++)
    {
        visited[i] = 0;
        d[i][j] = {1e18, 0};
    }
    queue<int>q;
    q.push(st);
    d[st][j] = {0, 1};
    while(q.empty() != 1)
    {
        int u = q.front();
        q.pop();
        if(visited[u])
            continue;
        visited[u] = 1;
        for(int v : g[u])
        {
            if(d[v][j].F > d[u][j].F + 1)
            {
                d[v][j] = {d[u][j].F + 1, d[u][j].S};
                q.push(v);
            }
            else if(d[v][j].F == d[u][j].F + 1)
                d[v][j].S += d[u][j].S;
        }
    }
}
void calc(int st, int ed)
{
    for(int i = 0; i < n; i++)
    {
        if(d[i][0].F + d[i][1].F == d[ed][0].F)
        {
            double t = 1.0 * d[i][0].S * d[i][1].S, t1 = max(d[st][1].S, d[ed][0].S);
            double x=1.0*t/t1;
            dp[i] += x;
        }
//        cout << setprecision(3) << fixed << dp[i] << endl;
    }
}
void solve()
{
    cin >> k;
    for(int i = 1; i <= k; i++)
    {
        int x, y;
        cin >> x >> y;
        bfs(x, 0);
        bfs(y, 1);
//        cout << i << ": ";
        calc(x, y);
    }
    int res = 0;
    for(int i = 0; i < n; i++)
    {
        if(dp[i] > dp[res])
            res = i;
    }
    cout << res;
}
}
main()
{
    if(fopen("TEST.inp", "r"))
    {
        freopen("TEST.inp", "r", stdin);
        freopen("TEST.out", "w", stdout);
    }
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n >> m;
    for(int i = 1; i <= m; i++)
    {
        int x, y;
        cin >> x >> y;
        g[x].push_back(y);
        g[y].push_back(x);
    }
    sub1::solve();
}
/**
4 6
0 1
1 2
2 3
3 0
0 2
3 1
3
0 2
3 2
1 2

**/

Compilation message

hotspot.cpp:83:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   83 | main()
      | ^~~~
hotspot.cpp: In function 'int main()':
hotspot.cpp:87:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   87 |         freopen("TEST.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
hotspot.cpp:88:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   88 |         freopen("TEST.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 592 KB Output is correct
2 Correct 1 ms 592 KB Output is correct
3 Correct 1 ms 592 KB Output is correct
4 Correct 1 ms 592 KB Output is correct
5 Correct 1 ms 592 KB Output is correct
6 Correct 1 ms 592 KB Output is correct
7 Correct 1 ms 592 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 592 KB Output is correct
2 Correct 1 ms 592 KB Output is correct
3 Correct 1 ms 592 KB Output is correct
4 Correct 1 ms 592 KB Output is correct
5 Correct 1 ms 592 KB Output is correct
6 Correct 1 ms 592 KB Output is correct
7 Correct 1 ms 592 KB Output is correct
8 Correct 1 ms 592 KB Output is correct
9 Correct 1 ms 592 KB Output is correct
10 Correct 1 ms 592 KB Output is correct
11 Correct 1 ms 592 KB Output is correct
12 Correct 1 ms 592 KB Output is correct
13 Correct 1 ms 592 KB Output is correct
14 Correct 1 ms 592 KB Output is correct

Subtask #3
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 592 KB Output is correct
2 Correct 1 ms 592 KB Output is correct
3 Correct 1 ms 592 KB Output is correct
4 Correct 1 ms 592 KB Output is correct
5 Correct 1 ms 592 KB Output is correct
6 Correct 1 ms 592 KB Output is correct
7 Correct 1 ms 592 KB Output is correct
8 Correct 1 ms 760 KB Output is correct
9 Correct 2 ms 592 KB Output is correct
10 Correct 2 ms 760 KB Output is correct
11 Correct 2 ms 592 KB Output is correct
12 Correct 1 ms 592 KB Output is correct
13 Correct 1 ms 592 KB Output is correct
14 Correct 2 ms 592 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 592 KB Output is correct
2 Correct 1 ms 592 KB Output is correct
3 Correct 1 ms 592 KB Output is correct
4 Correct 1 ms 592 KB Output is correct
5 Correct 1 ms 592 KB Output is correct
6 Correct 1 ms 592 KB Output is correct
7 Correct 1 ms 592 KB Output is correct
8 Correct 1 ms 592 KB Output is correct
9 Correct 1 ms 592 KB Output is correct
10 Correct 1 ms 592 KB Output is correct
11 Correct 1 ms 592 KB Output is correct
12 Correct 1 ms 592 KB Output is correct
13 Correct 1 ms 592 KB Output is correct
14 Correct 1 ms 592 KB Output is correct
15 Correct 1 ms 760 KB Output is correct
16 Correct 2 ms 592 KB Output is correct
17 Correct 2 ms 760 KB Output is correct
18 Correct 2 ms 592 KB Output is correct
19 Correct 1 ms 592 KB Output is correct
20 Correct 1 ms 592 KB Output is correct
21 Correct 2 ms 592 KB Output is correct
22 Correct 2 ms 592 KB Output is correct
23 Correct 2 ms 592 KB Output is correct
24 Correct 2 ms 592 KB Output is correct
25 Correct 2 ms 592 KB Output is correct
26 Correct 3 ms 592 KB Output is correct
27 Correct 1 ms 592 KB Output is correct
28 Correct 3 ms 592 KB Output is correct

Subtask #5
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 592 KB Output is correct
2 Correct 1 ms 592 KB Output is correct
3 Correct 1 ms 592 KB Output is correct
4 Correct 1 ms 592 KB Output is correct
5 Correct 1 ms 592 KB Output is correct
6 Correct 1 ms 592 KB Output is correct
7 Correct 1 ms 592 KB Output is correct
8 Correct 1 ms 592 KB Output is correct
9 Correct 1 ms 592 KB Output is correct
10 Correct 1 ms 592 KB Output is correct
11 Correct 1 ms 592 KB Output is correct
12 Correct 1 ms 592 KB Output is correct
13 Correct 1 ms 592 KB Output is correct
14 Correct 1 ms 592 KB Output is correct
15 Correct 2 ms 592 KB Output is correct
16 Correct 2 ms 592 KB Output is correct
17 Correct 4 ms 632 KB Output is correct
18 Correct 2 ms 592 KB Output is correct
19 Correct 4 ms 592 KB Output is correct
20 Correct 2 ms 592 KB Output is correct
21 Correct 1 ms 592 KB Output is correct

Subtask #6
36.0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 592 KB Output is correct
2 Correct 1 ms 592 KB Output is correct
3 Correct 1 ms 592 KB Output is correct
4 Correct 1 ms 592 KB Output is correct
5 Correct 1 ms 592 KB Output is correct
6 Correct 1 ms 592 KB Output is correct
7 Correct 1 ms 592 KB Output is correct
8 Correct 1 ms 592 KB Output is correct
9 Correct 1 ms 592 KB Output is correct
10 Correct 1 ms 592 KB Output is correct
11 Correct 1 ms 592 KB Output is correct
12 Correct 1 ms 592 KB Output is correct
13 Correct 1 ms 592 KB Output is correct
14 Correct 1 ms 592 KB Output is correct
15 Correct 1 ms 760 KB Output is correct
16 Correct 2 ms 592 KB Output is correct
17 Correct 2 ms 760 KB Output is correct
18 Correct 2 ms 592 KB Output is correct
19 Correct 1 ms 592 KB Output is correct
20 Correct 1 ms 592 KB Output is correct
21 Correct 2 ms 592 KB Output is correct
22 Correct 2 ms 592 KB Output is correct
23 Correct 2 ms 592 KB Output is correct
24 Correct 2 ms 592 KB Output is correct
25 Correct 2 ms 592 KB Output is correct
26 Correct 3 ms 592 KB Output is correct
27 Correct 1 ms 592 KB Output is correct
28 Correct 3 ms 592 KB Output is correct
29 Correct 2 ms 592 KB Output is correct
30 Correct 2 ms 592 KB Output is correct
31 Correct 4 ms 632 KB Output is correct
32 Correct 2 ms 592 KB Output is correct
33 Correct 4 ms 592 KB Output is correct
34 Correct 2 ms 592 KB Output is correct
35 Correct 1 ms 592 KB Output is correct
36 Correct 48 ms 848 KB Output is correct
37 Correct 120 ms 848 KB Output is correct
38 Correct 685 ms 1604 KB Output is correct
39 Correct 412 ms 1360 KB Output is correct
40 Correct 63 ms 848 KB Output is correct
41 Correct 421 ms 1360 KB Output is correct
42 Correct 558 ms 1360 KB Output is correct
43 Correct 24 ms 848 KB Output is correct
44 Correct 21 ms 848 KB Output is correct