#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define is insert
#define lb lower_bound
#define ll long long
#define V vector
#define MS multiset
#define PL pair<ll, ll>
#define F first
#define S second
#define PQ priority_queue
#define f0r(i, begin, end) for (ll i = begin; i < end; i ++)
#define For(i, end, begin) for (ll i = end; i > begin; i --)
#define all(x) x.begin(), x.end()
#define INF 1000000000000000000
#define inf 1000000000
#define MOD 1000000007
#define len(x) (ll)x.size()
#define fileread(file) ifstream fin; fin.open((string)file + ".in"); ofstream fout; fout.open((string)file + ".out")
#define fastio ios_base::sync_with_stdio(0); cin.tie(nullptr)
template<typename T> istream& operator>>(istream& in, vector<T>& a) {for(auto &x : a) in >> x; return in;};
template<typename T> ostream& operator<<(ostream& out, vector<T>& a) {for(auto &x : a) out << x << ' '; return out;};
V<int> find_subset (ll l, ll u, V<ll> wi) {
V<pair<ll, int>> w;
f0r (i, 0, len(wi)) {
w.pb({wi[i], i});
}
sort(all(w));
ll N = len(w);
ll lower = 0, upper = 0;
f0r (siz, 1, N + 1) {
lower += w[siz - 1].F;
upper += w[N - siz].F;
if (upper < l) continue;
if (lower > u) break;
// Gradually add
ll left = 0, right = siz, tot = lower;
while (tot < l) {
tot += w[right].F;
tot -= w[left].F;
left ++; right ++;
}
V<int> output;
f0r (j, left, right) {
output.pb(w[j].S);
}
return output;
}
return {};
}
Compilation message
/usr/bin/ld: /tmp/cc6HDNK3.o: in function `main':
grader.cpp:(.text.startup+0x18d): undefined reference to `find_subset(int, int, std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status
