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- #include <bits/stdc++.h>
- using namespace std;
- int main() {
- int n, k;
- cin >> n >> k;
- int niza[n];
- for(int i = 0; i < n; i++) {
- cin >> niza[i];
- }
- map<int, int> mapa;
- for(int i = 0; i < n; i++) {
- if(mapa.count(k - niza[i])) {
- cout << mapa[k - niza[i]] + 1 << " " << i + 1 << endl;
- return 0;
- }
- mapa[niza[i]] = i;
- }
- cout << "IMPOSSIBLE" << endl;
- return 0;
- }
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