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#include <iostream> #include <algorithm> using namespace std; int main() { int n, x; cin >> n >> x; int niza[n], orginalna[n]; for(int i = 0; i < n; i++) { cin >> niza[i]; orginalna[i] = niza[i]; } sort(niza, niza + n); int i = 0, j = n - 1; while(i < j) { if(niza[i] + niza[j] == x) { for(int k = 0; k < n; k++) { if(niza[i] == orginalna[k]) { cout << k + 1 << endl; orginalna[k] = -1; break; } } for(int k = 0; k < n; k++) { if(niza[j] == orginalna[k]) { cout << k + 1 << endl; orginalna[k] = -1; break; } } return 0; } if(niza[i] + niza[j] < x) { i++; } else { j--; } } cout << "IMPOSSIBLE" << endl; return 0; }
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