This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define int long long
#define pb push_back
#define freo(task) if(fopen(task".inp", "r")){ freopen(task".inp", "r", stdin); freopen(task".out", "w", stdout); }
#define FOR(i, a, b) for(int i=(a),_b = (b); i<=_b; i++)
#define FORD(i, a, b) for(int i=(a),_b = (b); i>=_b; i--)
#define bit(x, i) ((x >> i) & 1)
#define oo 1e18
#define pii pair<int, int>
#define debug cout<<"VUDEPTRAI\n";
using namespace std;
// mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
// ll rand(ll l, ll r) { assert(l <= r); return uniform_int_distribution<ll>(l, r)(rd); }
const int N = 5e3 + 5;
int n, m, k, pa[N], pb[N], da[N], db[N];
vector<int> g[N];
double sum[N];
void dijkstra(int u, int d[], int pa[]){
priority_queue<pii, vector<pii>, greater<pii>> pq;
d[u] = 0;
pq.push({0, u});
while(!pq.empty()){
pii top = pq.top();
pq.pop();
int u = top.second;
if(top.first > d[u]) continue;
for(int v:g[u])
if(d[v] > d[u] + 1){
d[v] = d[u] + 1;
pa[v] = pa[u];
pq.push({d[v], v});
}
else if(d[v] == d[u] + 1) pa[v] += pa[u];
}
}
void sub6(){
FOR(i, 1, m){
int u, v; cin>>u>>v;
g[u].pb(v);
g[v].pb(u);
}
cin>>k;
FOR(i, 1, k){
int a, b; cin>>a>>b;
FOR(i, 0, n) da[i] = db[i] = INT_MAX, pa[i] = pb[i] = 1;
dijkstra(a, da, pa);
dijkstra(b, db, pb);
// cout<<pa[b]<<" ";
FOR(u, 0, n)
if(da[u] + db[u] == da[b])
sum[u] += (pa[u] * pb[u] * 1.0) / pa[b] * 1.0;
}
int ans = 0;
FOR(i, 0, n) if(sum[i] > sum[ans]) ans = i;
cout<<ans;
}
void solve(){
cin>>n>>m;
sub6();
}
int32_t main(){
ios::sync_with_stdio(false);
cin.tie(nullptr); cout.tie(nullptr);
freo("TRAINCENTRE");
solve();
// cerr << "\nTime: " << 1.0 * clock() / CLOCKS_PER_SEC << "s\n";
return 0;
}
/*
*/
Compilation message (stderr)
hotspot.cpp: In function 'int32_t main()':
hotspot.cpp:4:55: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
4 | #define freo(task) if(fopen(task".inp", "r")){ freopen(task".inp", "r", stdin); freopen(task".out", "w", stdout); }
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
hotspot.cpp:64:5: note: in expansion of macro 'freo'
64 | freo("TRAINCENTRE");
| ^~~~
hotspot.cpp:4:88: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
4 | #define freo(task) if(fopen(task".inp", "r")){ freopen(task".inp", "r", stdin); freopen(task".out", "w", stdout); }
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
hotspot.cpp:64:5: note: in expansion of macro 'freo'
64 | freo("TRAINCENTRE");
| ^~~~
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