oj.uz

Submission #243529

# Submission time Handle Problem Language Result Execution time Memory
243529 2020-07-01T09:42:08 Z SamAnd Hotspot (NOI17_hotspot) C++17
100 / 100
 919 ms 1376 KB 
#include <bits/stdc++.h>
using namespace std;
#define m_p make_pair
#define all(x) (x).begin(),(x).end()
#define sz(x) ((int)(x).size())
#define fi first
#define se second
typedef long long ll;
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
mt19937 rnf(2106);
const int N = 5003;

int n, m;
vector<int> g[N];

int dx[N], dy[N];

int qx[N], qy[N];

bool c[N];
void bfs(int x, int d[], int qq[])
{
    memset(c, false, sizeof c);
    queue<int> q;
    c[x] = true;
    d[x] = 0;
    qq[x] = 1;
    q.push(x);
    while (!q.empty())
    {
        int x = q.front();
        q.pop();
        for (int i = 0; i < g[x].size(); ++i)
        {
            int h = g[x][i];
            if (!c[h])
            {
                c[h] = true;
                d[h] = d[x] + 1;
                q.push(h);
            }
            else if (d[h] == d[x] - 1)
            {
                qq[x] += qq[h];
            }
        }
    }
}

double ans[N];

void solv()
{
    scanf("%d%d", &n, &m);
    for (int i = 0; i < m; ++i)
    {
        int x, y;
        scanf("%d%d", &x, &y);
        g[x].push_back(y);
        g[y].push_back(x);
    }
    int qq;
    scanf("%d", &qq);
    while (qq--)
    {
        int x, y;
        scanf("%d%d", &x, &y);
        memset(qx, 0, sizeof qx);
        memset(qy, 0, sizeof qy);
        bfs(x, dx, qx);
        bfs(y, dy, qy);
        for (int z = 0; z < n; ++z)
        {
            if (dx[z] + dy[z] == dx[y])
            {
                ans[z] += (qx[z] * qy[z]) / (double)(qx[y]);
            }
        }
    }
    double maxu = -1.0;
    int maxx;
    for (int x = 0; x < n; ++x)
    {
        if (ans[x] > maxu)
        {
            maxu = ans[x];
            maxx = x;
        }
    }
    printf("%d\n", maxx);
}

int main()
{
    #ifdef SOMETHING
    freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);
    #endif // SOMETHING
    //ios_base::sync_with_stdio(false), cin.tie(0);
    solv();
    return 0;
}

//while ((double)clock() / CLOCKS_PER_SEC <= 0.9){}

Compilation message

hotspot.cpp: In function 'void bfs(int, int*, int*)':
hotspot.cpp:33:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 0; i < g[x].size(); ++i)
                         ~~^~~~~~~~~~~~~
hotspot.cpp: In function 'void solv()':
hotspot.cpp:54:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~
hotspot.cpp:58:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &x, &y);
         ~~~~~^~~~~~~~~~~~~~~~
hotspot.cpp:63:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &qq);
     ~~~~~^~~~~~~~~~~
hotspot.cpp:67:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &x, &y);
         ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 512 KB Output is correct
2 Correct 5 ms 512 KB Output is correct
3 Correct 5 ms 512 KB Output is correct
4 Correct 5 ms 512 KB Output is correct
5 Correct 5 ms 512 KB Output is correct
6 Correct 5 ms 512 KB Output is correct
7 Correct 5 ms 512 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 512 KB Output is correct
2 Correct 5 ms 512 KB Output is correct
3 Correct 5 ms 512 KB Output is correct
4 Correct 5 ms 512 KB Output is correct
5 Correct 5 ms 512 KB Output is correct
6 Correct 5 ms 512 KB Output is correct
7 Correct 5 ms 512 KB Output is correct
8 Correct 5 ms 512 KB Output is correct
9 Correct 5 ms 640 KB Output is correct
10 Correct 5 ms 512 KB Output is correct
11 Correct 5 ms 512 KB Output is correct
12 Correct 5 ms 512 KB Output is correct
13 Correct 5 ms 512 KB Output is correct
14 Correct 5 ms 512 KB Output is correct

Subtask #3
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 512 KB Output is correct
2 Correct 5 ms 512 KB Output is correct
3 Correct 5 ms 512 KB Output is correct
4 Correct 5 ms 512 KB Output is correct
5 Correct 5 ms 512 KB Output is correct
6 Correct 5 ms 512 KB Output is correct
7 Correct 5 ms 512 KB Output is correct
8 Correct 6 ms 512 KB Output is correct
9 Correct 6 ms 512 KB Output is correct
10 Correct 6 ms 512 KB Output is correct
11 Correct 7 ms 512 KB Output is correct
12 Correct 6 ms 512 KB Output is correct
13 Correct 5 ms 512 KB Output is correct
14 Correct 6 ms 512 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 512 KB Output is correct
2 Correct 5 ms 512 KB Output is correct
3 Correct 5 ms 512 KB Output is correct
4 Correct 5 ms 512 KB Output is correct
5 Correct 5 ms 512 KB Output is correct
6 Correct 5 ms 512 KB Output is correct
7 Correct 5 ms 512 KB Output is correct
8 Correct 5 ms 512 KB Output is correct
9 Correct 5 ms 640 KB Output is correct
10 Correct 5 ms 512 KB Output is correct
11 Correct 5 ms 512 KB Output is correct
12 Correct 5 ms 512 KB Output is correct
13 Correct 5 ms 512 KB Output is correct
14 Correct 5 ms 512 KB Output is correct
15 Correct 6 ms 512 KB Output is correct
16 Correct 6 ms 512 KB Output is correct
17 Correct 6 ms 512 KB Output is correct
18 Correct 7 ms 512 KB Output is correct
19 Correct 6 ms 512 KB Output is correct
20 Correct 5 ms 512 KB Output is correct
21 Correct 6 ms 512 KB Output is correct
22 Correct 6 ms 512 KB Output is correct
23 Correct 6 ms 512 KB Output is correct
24 Correct 7 ms 512 KB Output is correct
25 Correct 8 ms 512 KB Output is correct
26 Correct 8 ms 512 KB Output is correct
27 Correct 5 ms 512 KB Output is correct
28 Correct 7 ms 512 KB Output is correct

Subtask #5
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 512 KB Output is correct
2 Correct 5 ms 512 KB Output is correct
3 Correct 5 ms 512 KB Output is correct
4 Correct 5 ms 512 KB Output is correct
5 Correct 5 ms 512 KB Output is correct
6 Correct 5 ms 512 KB Output is correct
7 Correct 5 ms 512 KB Output is correct
8 Correct 5 ms 512 KB Output is correct
9 Correct 5 ms 640 KB Output is correct
10 Correct 5 ms 512 KB Output is correct
11 Correct 5 ms 512 KB Output is correct
12 Correct 5 ms 512 KB Output is correct
13 Correct 5 ms 512 KB Output is correct
14 Correct 5 ms 512 KB Output is correct
15 Correct 7 ms 640 KB Output is correct
16 Correct 6 ms 544 KB Output is correct
17 Correct 10 ms 640 KB Output is correct
18 Correct 7 ms 512 KB Output is correct
19 Correct 9 ms 640 KB Output is correct
20 Correct 7 ms 640 KB Output is correct
21 Correct 5 ms 512 KB Output is correct

Subtask #6
36.0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 512 KB Output is correct
2 Correct 5 ms 512 KB Output is correct
3 Correct 5 ms 512 KB Output is correct
4 Correct 5 ms 512 KB Output is correct
5 Correct 5 ms 512 KB Output is correct
6 Correct 5 ms 512 KB Output is correct
7 Correct 5 ms 512 KB Output is correct
8 Correct 5 ms 512 KB Output is correct
9 Correct 5 ms 640 KB Output is correct
10 Correct 5 ms 512 KB Output is correct
11 Correct 5 ms 512 KB Output is correct
12 Correct 5 ms 512 KB Output is correct
13 Correct 5 ms 512 KB Output is correct
14 Correct 5 ms 512 KB Output is correct
15 Correct 6 ms 512 KB Output is correct
16 Correct 6 ms 512 KB Output is correct
17 Correct 6 ms 512 KB Output is correct
18 Correct 7 ms 512 KB Output is correct
19 Correct 6 ms 512 KB Output is correct
20 Correct 5 ms 512 KB Output is correct
21 Correct 6 ms 512 KB Output is correct
22 Correct 6 ms 512 KB Output is correct
23 Correct 6 ms 512 KB Output is correct
24 Correct 7 ms 512 KB Output is correct
25 Correct 8 ms 512 KB Output is correct
26 Correct 8 ms 512 KB Output is correct
27 Correct 5 ms 512 KB Output is correct
28 Correct 7 ms 512 KB Output is correct
29 Correct 7 ms 640 KB Output is correct
30 Correct 6 ms 544 KB Output is correct
31 Correct 10 ms 640 KB Output is correct
32 Correct 7 ms 512 KB Output is correct
33 Correct 9 ms 640 KB Output is correct
34 Correct 7 ms 640 KB Output is correct
35 Correct 5 ms 512 KB Output is correct
36 Correct 80 ms 768 KB Output is correct
37 Correct 220 ms 768 KB Output is correct
38 Correct 919 ms 1204 KB Output is correct
39 Correct 878 ms 1272 KB Output is correct
40 Correct 102 ms 768 KB Output is correct
41 Correct 619 ms 1272 KB Output is correct
42 Correct 681 ms 1376 KB Output is correct
43 Correct 50 ms 760 KB Output is correct
44 Correct 45 ms 640 KB Output is correct