//Never stop trying
#include "citymapping.h"
#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
template <typename T>
using ordered_set=tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
//s.order_of_key(), *s.find_by_order()
using namespace std;
#define boost ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
typedef string str;
typedef long long ll;
#define int ll
typedef double db;
typedef long double ld;
typedef pair<int,int> pi;
#define fi first
#define se second
typedef vector<int> vi;
typedef vector<ld> vd;
typedef vector<str> vs;
typedef vector<pi> vpi;
#define pb push_back
#define eb emplace_back
#define pf push_front
#define lb lower_bound
#define ub upper_bound
#define sz(x) (int)x.size()
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define endl "\n"
const int MOD = 1e9+7; //998244353
const ll INF = 1e18;
const int nx[4]={0,0,1,-1}, ny[4]={1,-1,0,0}; //right left down up
//int get_distance(int x, int y){}
void find_roads(int N, int Q, int A[], int B[], int W[]){
if(Q==12000){
int mx=0, mxi;
for(int i=2; i<=N; i++){
int x=get_distance(1,i);
if(x>mx){mx=x; mxi=i;}
}
vpi vec;
vec.pb({0,mxi});
for(int i=1; i<=N; i++) if(i!=mxi){
int x=get_distance(i,mxi);
vec.pb({x,i});
}
sort(all(vec));
for(int i=1; i<sz(vec); i++){
A[i]=vec[i].se, B[i]=vec[i-1].se, W[i]=vec[i].fi-vec[i-1].fi;
}
}
}
Compilation message
citymapping.cpp: In function 'void find_roads(ll, ll, ll*, ll*, ll*)':
citymapping.cpp:60:28: warning: 'mxi' may be used uninitialized in this function [-Wmaybe-uninitialized]
int x=get_distance(i,mxi);
~~~~~~~~~~~~^~~~~~~
/tmp/ccxcqAHf.o: In function `main':
grader.cpp:(.text.startup+0x1d0): undefined reference to `find_roads(int, int, int*, int*, int*)'
collect2: error: ld returned 1 exit status
