#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair <ll,ll> pll;
typedef pair <int,int> pii;
typedef pair <int,pii> piii;
#define forr(_a,_b,_c) for(int _a = (_b); _a <= (_c); ++_a)
#define ford(_a,_b,_c) for(int _a = (_b) + 1; _a --> (_c);)
#define forf(_a,_b,_c) for(int _a = (_b); _a < (_c); ++_a)
#define st first
#define nd second
#define pb push_back
#define mp make_pair
#define all(x) begin(x),end(x)
#define mask(i) (1LL << (i))
#define bit(x, i) (((x) >> (i)) & 1)
#define bp __builtin_popcountll
#define file "test"
const int N = 5e5 + 5;
const ll oo = 1e9;
const ll mod = 1e9 + 7; // 998244353;
vector <int> find_router (int l, int n, int q){
vector <int> a(n, 0);
forf (i, 1, n){
int l = a[i - 1] + 1, r = l;
while (l < r){
int mid = (l + r) >> 1;
if (use_detector(mid) < i)
l = mid + 1;
else r = mid;
}
a[i] = l - 1 + (l - 1 - a[i - 1]);
}
return a;
}
//x..o..x..
Compilation message
routers.cpp: In function 'std::vector<int> find_router(int, int, int)':
routers.cpp:34:17: error: 'use_detector' was not declared in this scope
34 | if (use_detector(mid) < i)
| ^~~~~~~~~~~~
