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#include <bits/stdc++.h> using namespace std; typedef long long ll; int main() { int n; ll x; cin >> n >> x; pair<ll, int> niza[n]; for(int i = 0; i < n; i++) { cin >> niza[i].first; niza[i].second = i; } sort(niza, niza + n); for(int i = 0; i < n; i++) { for(int j = i + 1; j < n; j++) { int L = j + 1, R = n - 1; while(L < R) { ll sum = niza[i].first + niza[j].first + niza[L].first + niza[R].first; if(sum == x) { cout << niza[i].second + 1 << " " << niza[j].second +1 << " " << niza[L].second + 1 << " " << niza[R].second + 1 << endl; return 0; } if(sum < x) { L++; } else { R--; } } } } cout << "IMPOSSIBLE" << endl; return 0; }
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