oj.uz

Submission #1105372

# Submission time Handle Problem Language Result Execution time Memory
1105372 2024-10-26T08:51:01 Z nghia0912 Hotspot (NOI17_hotspot) C++17
100 / 100
 719 ms 1224 KB 
#define COPYRIGHT CODE BY TRINH TUAN NGHIA
#include<bits/stdc++.h>
//#pragma GCC optimize("O3")
//#pragma GCC optimize("unroll-loops")
//#pragma GCC target("popcnt")
#define Boost ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
#define ll long long
#define endl "\n"
#define st first
#define nd second
#define ii pair <int,int>
#define iii pair <int,ii>
#define iiii pair <ii,ii>
#define pb push_back
#define NAME "traincentre"
using namespace std;
const int N = 5e3 + 10;
const int M = 4e4 + 10;
int n, m, k;
vector<int> adj[N];
long double E[N];
ll d[N], d2[N];
long double f[N], f2[N];
vector<ii> cb;

void BFS(int st, int en){
    queue<int> q;
    for (int i = 0; i < n;++i){
        d[i] = 3e18;
        d2[i] = 3e18;
        f[i] = 0;
        f2[i] = 0;
    }
    f[st] = 1;
    d[st] = 0;
    d2[en] = 0;
    f2[en] = 1;
    q.push(st);
    while (!q.empty()){
        int u = q.front();q.pop();
        for (auto v : adj[u]){
            if (d[u] + 1 < d[v]){
                d[v] = d[u] + 1;
                f[v] = f[u];
                q.push(v);
            }
            else if (d[u] + 1 == d[v]){
                f[v] += f[u];
            }
        }
    }
    q.push(en);
    while (!q.empty()){
        int u = q.front();q.pop();
        for (auto v : adj[u]){
            if (d2[u] + 1 < d2[v]){
                d2[v] = d2[u] + 1;
                f2[v] = f2[u];
                q.push(v);
            }
            else if (d2[u] + 1 == d2[v]){
                f2[v] += f2[u];
            }
        }
    }
    for (int i = 0; i < n; ++i){
        if (d[i] + d2[i] != d[en])continue;
        long double cc = f[i] * f2[i];
        E[i] += cc / f[en];
//        cout << "Cmm " << st << " " << i << " " << cc << " " << f[en] << endl;
    }

}
void inp (){
    cin >>n  >> m;
    for (int i = 1; i <= m; ++i){
        int u, v;
        cin >> u >> v;
        adj[u].pb(v);
        adj[v].pb(u);
    }
    cin >> k;
    for (int i =1; i <= k; ++i){
        int x, y;
        cin>> x >>  y;
        cb.pb({x,  y});
    }
}
void solve(){
    for (auto x : cb){
        BFS(x.st, x.nd);
    }
    int mx = -1;
    for (int i= 0; i < n; ++i){
        if (mx == -1 or E[i] > E[mx]){
            mx = i;
        }
//        cout << i << " " << E[i] << endl;
    }
    cout <<mx << endl;
}
signed main (){
    if (fopen(NAME".inp", "r")){
        freopen(NAME".inp", "r", stdin);
        freopen(NAME".out", "w", stdout);
    }
    Boost;
    inp();
    solve();
}
/*
input

*/

/*
output

*/

Compilation message

hotspot.cpp: In function 'int main()':
hotspot.cpp:104:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  104 |         freopen(NAME".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
hotspot.cpp:105:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  105 |         freopen(NAME".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 592 KB Output is correct
9 Correct 1 ms 592 KB Output is correct
10 Correct 2 ms 592 KB Output is correct
11 Correct 2 ms 664 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 760 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 592 KB Output is correct
16 Correct 1 ms 592 KB Output is correct
17 Correct 2 ms 592 KB Output is correct
18 Correct 2 ms 664 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 760 KB Output is correct
22 Correct 1 ms 592 KB Output is correct
23 Correct 1 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 2 ms 592 KB Output is correct
27 Correct 2 ms 592 KB Output is correct
28 Correct 3 ms 760 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 1 ms 592 KB Output is correct
17 Correct 4 ms 592 KB Output is correct
18 Correct 2 ms 592 KB Output is correct
19 Correct 5 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 592 KB Output is correct
16 Correct 1 ms 592 KB Output is correct
17 Correct 2 ms 592 KB Output is correct
18 Correct 2 ms 664 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 760 KB Output is correct
22 Correct 1 ms 592 KB Output is correct
23 Correct 1 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 2 ms 592 KB Output is correct
27 Correct 2 ms 592 KB Output is correct
28 Correct 3 ms 760 KB Output is correct
29 Correct 2 ms 592 KB Output is correct
30 Correct 1 ms 592 KB Output is correct
31 Correct 4 ms 592 KB Output is correct
32 Correct 2 ms 592 KB Output is correct
33 Correct 5 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 62 ms 592 KB Output is correct
37 Correct 140 ms 900 KB Output is correct
38 Correct 719 ms 1200 KB Output is correct
39 Correct 484 ms 1104 KB Output is correct
40 Correct 73 ms 848 KB Output is correct
41 Correct 463 ms 1224 KB Output is correct
42 Correct 591 ms 1104 KB Output is correct
43 Correct 28 ms 592 KB Output is correct
44 Correct 23 ms 836 KB Output is correct