Submission #1160261

#	Time	Username	Problem	Language	Result	Execution time	Memory
1160261		sl1pzz	Bigger segments (IZhO19_segments)	C++20	0 / 100	0 ms	328 KiB

segments

#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>

using namespace std;
// using namespace __gnu_pbds;

// #define ordered_set tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update>
// #pragma GCC target("avx2")
// #pragma GCC optimize("Ofast")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4.1,sse4.2,popcnt,abm,mmx,avx,tune=native")

//-------------------------------------------------------------------------------------------------------------

#define int long long
#define pb push_back
#define ew "\n"
#define all(x) (x).begin(), (x).end()
#define st first
#define nd second
#define len(x) (int)x.size()
#define eb emplace_back
#define turbo                       \
  ios_base::sync_with_stdio(false); \
  cin.tie(0);                       \
  cout.tie(0);

const int maxn = 5e5 + 12;
const int mxx = 100100;
const int MOD = 1e9 + 7;
const int inf = 2e18 + 7;
const int HH = 1e2 + 70;

int n;
int a[maxn], pref[maxn], sm[maxn], dp[maxn];

void code()
{
  cin >> n;
  for (int i = 1; i <= n; i++)
  {
    cin >> a[i];
    sm[i] = inf;
    pref[i] = pref[i - 1] + a[i];
  }
  for (int i = 1; i <= n; i++)
  {
    int lst = dp[i - 1] - 1;
    for (int j = i - 1; j >= 0; j--)
    {
      if (dp[j] < lst)
      {
        break;
      }
      if (dp[i] < dp[j] || (dp[i] == dp[j] && sm[j] + pref[i] - pref[j] < sm[i]))
      {
        dp[i] = dp[j];
        sm[i] = sm[j] + pref[i] - pref[j];
      }
      if (sm[j] <= pref[i] - pref[j] && dp[i] < dp[j] + 1 || (dp[i] == dp[j] + 1 && pref[i] - pref[j] < sm[i]))
      {
        dp[i] = dp[j] + 1;
        sm[i] = pref[i] - pref[j];
      }
    }
  }
  cout << dp[n];
}

int32_t main()
{
  // freopen("248.in", "r", stdin);
  // freopen("248.out", "w", stdout);
  // turbo;
  int tt = 1, j = 1;
  // cin >> tt;
  while (tt--)
  {
    // cout << "Case " << j << ":" << ew;
    code();
    // j++;
  }
}
// by sl1pzz
// going to respa silver/goldz

• Subtask 1: 0 / 13
• Subtask 2: 0 / 14
• Subtask 3: 0 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27