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  1. #include <bits/stdc++.h>
  2. #define int long long
  3. using namespace std;
  4. pair<int, int> a[10001];
  5. int n, m, r = 0, l = 0, k = 0,res;
  6. bool cmp(pair<int, int> v, pair<int, int> t) {
  7.     return v.first < t.first;
  8. }
  9. signed main() {
  10.     cin >> n >> m;
  11.     for (int i = 1; i <= n; i++) {
  12.         cin >> a[i].first;
  13.         a[i].second = i;
  14.     }
  15.     sort(a + 1, a + n + 1, cmp);
  16.     for (int i = 1; i <= n - 1; i++) { 
  17.         for (int j = i + 1; j <= n; j++) { 
  18.             int ans = m - a[i].first - a[j].first;
  19.             if (ans < 0) break;
  20.             int lo = 1 , hi = n; 
  21.             while (lo <= hi) {
  22.                  int mid = (lo + hi) / 2;
  23.                  if (a[mid].first <= ans) {
  24.                     lo = mid + 1;
  25.                     res=mid;
  26.                  }
  27.                  else {
  28.                     hi = mid - 1;
  29.                  }
  30.             }
  31.             if (a[res].first==ans&&a[res].second!=a[i].second&&a[res].second!=a[j].second)
  32.             {
  33.                 l=a[i].second;
  34.                 r=a[j].second;
  35.                 k=a[res].second;
  36.                 cout<<l<<" "<<r<<" "<<k;
  37.                 return 0;
  38.             }
  39.         }
  40.     }
  41.     if (l == 0) {
  42.         cout << "IMPOSSIBLE";
  43.     }
  44.     return 0;
  45. }
Success #stdin #stdout 0.01s 5300KB
comments (?)
stdin
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4 8
2 7 5 1
stdout
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4 1 3
https://ideone.com/to9rfO
language:
C++14 (clang 8.0)
created:
274 days ago
visibility:
secret

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