#include <bits/stdc++.h>
#include <traffic.h>
using namespace std;
using ll = long long;
//#define int long long
#define FOR(i, a, b) for (int i = a; i <= b; i++)
#define FORD(i, a, b) for (int i = b; i >= a; i --)
#define REP(i, n) for (int i = 0; i < n; ++i)
#define REPD(i, n) for (int i = n - 1; i >= 0; --i)
#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)
constexpr ll LINF = (1ll << 60);
constexpr int INF = (1ll << 30);
constexpr int Mod = 1e9 + 7;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
void setupIO(){
#define name "Whisper"
//Phu Trong from Nguyen Tat Thanh High School for gifted student
srand(time(NULL));
cin.tie(nullptr)->sync_with_stdio(false); cout.tie(nullptr);
//freopen(name".inp", "r", stdin);
//freopen(name".out", "w", stdout);
cout << fixed << setprecision(10);
}
template <class X, class Y>
bool minimize(X &x, const Y &y){
X eps = 1e-9;
if (x > y + eps) {x = y; return 1;}
return 0;
}
template <class X, class Y>
bool maximize(X &x, const Y &y){
X eps = 1e-9;
if (x + eps < y) {x = y; return 1;}
return 0;
}
const int MAX = 1e6 + 5;
vector<int> G[MAX];
int numNode;
int p[MAX], s[MAX], d[MAX];
ll dp[MAX], sz[MAX];
void dfs_down(int u, int pa = -1){
sz[u] = p[u];
for (int &v : G[u]) if(v ^ pa){
dfs_down(v, u);
sz[u] += sz[v];
maximize(dp[u], sz[v]);
}
}
void dfs_up(int u, int pa = -1){
for(int &v : G[u]) if(v ^ pa){
dfs_up(v, u);
}
maximize(dp[u], sz[0] - sz[u]);
}
ll LocateCentre(int _n, int P[], int S[], int D[]){
numNode = _n;
for (int i = 0; i < numNode; ++i){
p[i] = P[i];
s[i] = S[i];
d[i] = D[i];
}
for (int i = 0; i < numNode - 1; ++i){
G[s[i]].emplace_back(d[i]);
G[d[i]].emplace_back(s[i]);
}
dfs_down(0);
dfs_up(0);
int ans = 0;
for (int i = 1; i < numNode; ++i){
if (dp[i] < dp[ans]){
ans = i;
}
}
return ans;
}
//int P[MAX], S[MAX], D[MAX];
//void Whisper(){
// cin >> numNode;
// for (int i = 0; i < numNode; ++i) cin >> P[i];
// for (int i = 0; i < numNode - 1; ++i){
// cin >> S[i] >> D[i];
// }
// cout << LocateCentre(numNode, P, S, D);
//}
//signed main(){
// setupIO();
// int Test = 1;
//// cin >> Test;
// for ( int i = 1 ; i <= Test ; i++ ){
// Whisper();
// if (i < Test) cout << '\n';
// }
//}
Compilation message
traffic.cpp:62:4: error: ambiguating new declaration of 'll LocateCentre(int, int*, int*, int*)'
62 | ll LocateCentre(int _n, int P[], int S[], int D[]){
| ^~~~~~~~~~~~
In file included from traffic.cpp:2:
traffic.h:1:5: note: old declaration 'int LocateCentre(int, int*, int*, int*)'
1 | int LocateCentre(int N, int P[], int S[], int D[]);
| ^~~~~~~~~~~~
