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Submission #210002

# Submission time Handle Problem Language Result Execution time Memory
210002 2020-03-16T08:40:03 Z Alexa2001 Hotspot (NOI17_hotspot) C++17
0 / 100
 5 ms 504 KB 
#include <bits/stdc++.h>

using namespace std;

///10:23

const int Nmax = 5005;

long double ans[Nmax];
bool used[Nmax];
vector<int> v[Nmax];

int dist[Nmax][Nmax], pos[Nmax][Nmax], A[Nmax], B[Nmax];
int n, m, k;

void doo(int node, int dist[], int pos[])
{
    int i;
    for(i=1; i<=n; ++i) dist[i] = -1;

    dist[node] = 0;
    pos[node] = 1;

    queue<int> q;
    q.push(node);

    while(q.size())
    {
        node = q.front();
        q.pop();

        for(auto it : v[node])
            if(dist[it] == -1)
            {
                dist[it] = dist[node] + 1;
                pos[it] = pos[node];
                q.push(it);
            }
            else if(dist[it] == dist[node] + 1)
                pos[it] += pos[node];
    }
}

int main()
{
 //   freopen("input", "r", stdin);
    cin.sync_with_stdio(false); cin.tie(0);

    cin >> n >> m;

    int i, j;
    for(i=1; i<=m; ++i)
    {
        int x, y;
        cin >> x >> y;
        v[x].push_back(y);
        v[y].push_back(x);
    }

    cin >> k;
    for(i=1; i<=k; ++i)
    {
        cin >> A[i] >> B[i];
        if(!used[A[i]]) doo(A[i], dist[A[i]], pos[A[i]]), used[A[i]] = 1;
        if(!used[B[i]]) doo(B[i], dist[B[i]], pos[B[i]]), used[B[i]] = 1;
    }

    for(i=1; i<=k; ++i)
        for(j=1; j<=n; ++j)
            if(dist[A[i]][j] + dist[B[i]][j] == dist[A[i]][B[i]])
                ans[j] += (long double) pos[A[i]][j] * pos[B[i]][j] / pos[A[i]][B[i]];

    int id = 1;
    for(i=1; i<=n; ++i)
        if(ans[i] > ans[id])
            id = i;
    cout << id << '\n';
    return 0;
}

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 504 KB Output is correct
2 Correct 5 ms 504 KB Output is correct
3 Correct 5 ms 504 KB Output is correct
4 Correct 5 ms 504 KB Output is correct
5 Incorrect 5 ms 504 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #2
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 504 KB Output is correct
2 Correct 5 ms 504 KB Output is correct
3 Correct 5 ms 504 KB Output is correct
4 Correct 5 ms 504 KB Output is correct
5 Incorrect 5 ms 504 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #3
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 504 KB Output is correct
2 Correct 5 ms 504 KB Output is correct
3 Correct 5 ms 504 KB Output is correct
4 Correct 5 ms 504 KB Output is correct
5 Incorrect 5 ms 504 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 504 KB Output is correct
2 Correct 5 ms 504 KB Output is correct
3 Correct 5 ms 504 KB Output is correct
4 Correct 5 ms 504 KB Output is correct
5 Incorrect 5 ms 504 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #5
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 504 KB Output is correct
2 Correct 5 ms 504 KB Output is correct
3 Correct 5 ms 504 KB Output is correct
4 Correct 5 ms 504 KB Output is correct
5 Incorrect 5 ms 504 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #6
0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 504 KB Output is correct
2 Correct 5 ms 504 KB Output is correct
3 Correct 5 ms 504 KB Output is correct
4 Correct 5 ms 504 KB Output is correct
5 Incorrect 5 ms 504 KB Output isn't correct
6 Halted 0 ms 0 KB -