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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int n, m;
  4. vector<long long> a;
  5. vector<long long> b;
  6. bool check(long long T) {
  7.     for (int i = 1; i <= n; i++) {
  8.         b[i] = a[i];
  9.     }
  10.     int last = n;
  11.     while (last > 0 && b[last] == 0) {
  12.         last--;
  13.     }
  14.     if (last == 0){
  15.         return true;
  16.     }
  17.     for (int i = 1; i <= m; i++) {
  18.         if (T <= last){
  19.             return false;
  20.         }
  21.         long long rem = T - last;
  22.         while (last > 0 && rem > 0) {
  23.             if (b[last] <= rem) {
  24.                 rem -= b[last];
  25.                 b[last] = 0;
  26.                 last--;
  27.                 while (last > 0 && b[last] == 0) last--;
  28.             } else {
  29.                 b[last] -= rem;
  30.                 rem = 0;
  31.             }
  32.         }
  33.         if (last == 0){
  34.             return true;
  35.         }
  36.     }
  37.     return last == 0;
  38. }
  39. int main() {
  40.     ios_base::sync_with_stdio(false);
  41.     cin.tie(NULL);
  42.     freopen("wca.inp", "r", stdin);
  43.     freopen("wca.out", "w", stdout);
  44.     cin>>n>>m;
  45.     a.resize(n + 1);
  46.     b.resize(n + 1);
  47.     for (int i = 1; i <= n; i++) {
  48.         cin >> a[i];
  49.     }
  50.     long long low = 0;
  51.     long long high = 2000000000000000LL;
  52.     long long ans = high;
  53.     while (low <= high) {
  54.         long long mid = low + (high - low) / 2;
  55.         if (check(mid)) {
  56.             ans = mid;
  57.             high = mid - 1;
  58.         } else {
  59.             low = mid + 1;
  60.         }
  61.     }
  62.     cout << ans << "\n";
  63.     return 0;
  64. }
  65.  
Success #stdin #stdout 0s 5320KB
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https://ideone.com/QriWTt
language:
C++14 (gcc 8.3)
created:
10 hours ago
visibility:
public

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