Submission #826155

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Source Code Expand

#include <bits/stdc++.h>
 
using namespace std;
 
int main() {
  int n,m;
  cin >> n >> m;
  vector<int> a(n);
  for (int& x : a) {
    cin >> x;
  }
  int idx = -1;
  for (int i = 0; i < a.size() - 1; i++) {
    if (a[i] + a[i+1] >= m) {
      idx = i;
    }
  }
  if (idx == -1) {
    cout << "Impossible\n";
  } else {
    cout << "Possible\n";
    for (int i = 0; i < idx; i++) {
      cout << (i + 1) << "\n";
    }
    for (int i = a.size() - 2; i >= idx; i--) {
      cout << (i + 1) << "\n";
    }
  }
  return 0;
}

Submission Info

Judge Result