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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. using namespace std;
  5.  
  6. // Fast I/O Macro
  7. void Mbappe() {
  8.     ios_base::sync_with_stdio(false);
  9.     cin.tie(NULL);
  10.     cout.tie(NULL);
  11. }
  12.  
  13. void solve() {
  14.     int n;
  15.     long long d;
  16.     if (!(cin >> n >> d)) return;
  17.  
  18.     vector<long long> a(n);
  19.     for (int i = 0; i < n; i++) {
  20.         cin >> a[i];
  21.     }
  22.  
  23.     // Function to check if we can achieve a final height of 'mid'
  24.     auto check = [&](long long mid) {
  25.         long long req = mid;
  26.         // Moving backwards
  27.         for (int i = n - 1; i >= 0; i--) {
  28.             if (req >= a[i]) {
  29.                 req += a[i];
  30.             }
  31.         }
  32.         return req <= d; // Can we do this within our budget?
  33.     };
  34.  
  35.     long long low = 0, high = d, ans = 0;
  36.  
  37.     // Binary Search on the final height
  38.     while (low <= high) {
  39.         long long mid = low + (high - low) / 2;
  40.         if (check(mid)) {
  41.             ans = mid;       // If valid, save it and try for a higher height
  42.             low = mid + 1;
  43.         } else {
  44.             high = mid - 1;  // If not valid, we need to aim lower
  45.         }
  46.     }
  47.  
  48.     cout << ans << "\n";
  49. }
  50.  
  51. int main() {
  52.     Mbappe();
  53.     // Vamoooos__ACCPTED
  54.     int t = 1; 
  55.     // cin >> t; // Uncomment if the problem adds multiple test cases later
  56.     while (t--) {
  57.         solve();
  58.     }
  59.     return 0;
  60. }
Success #stdin #stdout 0s 5320KB
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https://ideone.com/nMw9fC
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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