| 4 | #define rep(i,a,b) for(int i=a; i < (b); ++i) |
| 5 | |
| 6 | int main(){ |
| 7 | ios_base::sync_with_stdio(false),cin.tie(nullptr); |
| 8 | |
| 9 | int n, x; cin >> n >> x; |
| 10 | map<int,int>m; |
| 11 | vector<int> V; |
| 12 | rep(i,0,n){ |
| 13 | int v; cin >> v; |
| 14 | V.push_back(v); |
| 15 | m[v] = i; |
| 16 | } |
| 17 | |
| 18 | rep(i,0,n) { |
| 19 | if (m.find(x - V[i]) != m.end() && m[x-V[i]]!=i) { |
| 20 | cout << i+ 1 << " " << m[x-V[i]] + 1 << endl; |
| 21 | exit(0); |
| 22 | } |
| 23 | } |
| 24 | cout << "IMPOSSIBLE" << endl; |
| 25 | return 0; |
| 26 | } |
| 27 | |
| 28 |