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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 k = 0; k < n; k++) { int i = k + 1, j = n - 1; while(i < j) { if(niza[i].first + niza[j].first + niza[k].first == x) { cout << niza[k].second + 1 << " " << niza[i].second + 1 << " " << niza[j].second + 1 << endl; return 0; } if(niza[i].first + niza[j].first + niza[k].first < x) { i++; } else { j--; } } } cout << "IMPOSSIBLE" << endl; return 0; }
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