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Submission #1102926

# Submission time Handle Problem Language Result Execution time Memory
1102926 2024-10-19T09:01:19 Z Cam Hotspot (NOI17_hotspot) C++17
38 / 100
 11 ms 764 KB 
#include <bits/stdc++.h>
#define name "traincentre"
#define ll long long
#define db double
#define pb push_back
#define ii pair<int,int>
#define mp make_pair
#define fi first
#define se second
#define bit(x,i) (((x)>>(i))&1)
#define sz(s) (int)(s).size()
#define all(a) (a).begin(),(a).end()
#define rep(i,a,b) for(int i=(a), _b=(b); i<=_b; i++)
#define repd(i,a,b) for(int i=(a), _b=(b); i>=_b; i--)
#define _unique(x) (x).resize(unique(all(x)) - (x).begin())

using namespace std;

const int N = 5e3 + 3;
const int inf = 1e9 + 7;
const int base = 31;
const double eps = 0.00000001;

int n, m, k;
int d[2][N];
db cnt[2][N], ans[N], res;
vector <int> a[N];

void dijkstra (int o, int s) {

    rep (i, 1, n) d[o][i] = inf, cnt[o][i] = 0;
    priority_queue <ii, vector <ii>, greater <ii> > q;
    q.push (mp (0, s)); d[o][s] = 0; cnt[o][s] = 1;

    while (sz (q)) {

        int u = q.top().se, du = q.top().fi; q.pop();
        if (du > d[o][u]) continue;
        for (int v : a[u]) {

            if (d[o][v] > d[o][u] + 1) {

                d[o][v] = d[o][u] + 1;
                q.push (mp (d[o][v], v));
                cnt[o][v] = cnt[o][u];
            }
            if (d[o][v] == d[o][u] + 1) cnt[o][v] += cnt[o][u];
        }
    }
}
void solve (void) {

    cin >> n >> m;
    rep (i, 1, m) {

        int u, v; cin >> u >> v;
        u ++; v ++;
        a[u].pb (v); a[v].pb (u);
    }
    cin >> k;
    rep (i, 1, k) {

        int x, y;
        cin >> x >> y;
        x ++; y ++;
        dijkstra (0, x); dijkstra (1, y);
        rep (u, 1, n) if (d[0][u] + d[1][u] == d[0][y]) {

            db tmp = (db)(cnt[0][u] * cnt[1][u]);
            tmp = tmp / (db)cnt[0][y];
            ans[u] += tmp;
        }
    }
    int u;
    rep (i, 1, n) if (ans[i] > res) {

        res = ans[i];
        u = i;
    }
    cout << u - 1;
}

signed main()
{
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    //freopen(name".inp","r",stdin);
    //freopen(name".out","w",stdout);

    solve();
    return 0;
}

Compilation message

hotspot.cpp: In function 'void solve()':
hotspot.cpp:80:17: warning: 'u' may be used uninitialized in this function [-Wmaybe-uninitialized]
   80 |     cout << u - 1;
      |                 ^

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 764 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 764 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 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 1 ms 756 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 764 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 2 ms 592 KB Output is correct
10 Correct 2 ms 640 KB Output is correct
11 Correct 4 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 3 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 764 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 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 1 ms 756 KB Output is correct
15 Correct 1 ms 592 KB Output is correct
16 Correct 2 ms 592 KB Output is correct
17 Correct 2 ms 640 KB Output is correct
18 Correct 4 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 3 ms 592 KB Output is correct
22 Correct 3 ms 592 KB Output is correct
23 Correct 3 ms 592 KB Output is correct
24 Correct 6 ms 592 KB Output is correct
25 Correct 11 ms 592 KB Output is correct
26 Correct 9 ms 660 KB Output is correct
27 Correct 2 ms 592 KB Output is correct
28 Correct 8 ms 592 KB Output is correct

Subtask #5
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 592 KB Output is correct
2 Correct 1 ms 764 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 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 1 ms 756 KB Output is correct
15 Correct 2 ms 592 KB Output is correct
16 Correct 2 ms 592 KB Output is correct
17 Correct 5 ms 744 KB Output is correct
18 Incorrect 4 ms 592 KB Output isn't correct
19 Halted 0 ms 0 KB -

Subtask #6
0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 592 KB Output is correct
2 Correct 1 ms 764 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 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 1 ms 756 KB Output is correct
15 Correct 1 ms 592 KB Output is correct
16 Correct 2 ms 592 KB Output is correct
17 Correct 2 ms 640 KB Output is correct
18 Correct 4 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 3 ms 592 KB Output is correct
22 Correct 3 ms 592 KB Output is correct
23 Correct 3 ms 592 KB Output is correct
24 Correct 6 ms 592 KB Output is correct
25 Correct 11 ms 592 KB Output is correct
26 Correct 9 ms 660 KB Output is correct
27 Correct 2 ms 592 KB Output is correct
28 Correct 8 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 5 ms 744 KB Output is correct
32 Incorrect 4 ms 592 KB Output isn't correct
33 Halted 0 ms 0 KB -