Submission #829210

#	Time	Username	Problem	Language	Result	Execution time	Memory
829210		arush_agu	K blocks (IZhO14_blocks)	C++17	18 / 100	1 ms	340 KiB

blocks

#include <algorithm>
#include <cctype>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <functional>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <vector>
 
#ifdef DEBUG
#include <time.h>
#endif
 
#define all(a) (a).begin(), (a).end()
#define rev(a) (a).rbegin(), (a).rend()
#define F first
#define S second
int recur_depth = 0;
#ifdef DEBUG
#define dbg(x)                                                                 \
  {                                                                            \
    ++recur_depth;                                                             \
    auto x_ = x;                                                               \
    --recur_depth;                                                             \
    cerr << string(recur_depth, '\t') << "\e[91m" << __func__ << ":"           \
         << __LINE__ << "\t" << #x << " = " << x_ << "\e[39m" << endl;         \
  }
#else
#define dbg(x)
#endif
 
using namespace std;
using namespace __gnu_pbds;
 
typedef pair<int, int> ii;
 
typedef long long ll;
typedef long double ld;
typedef pair<ll, ll> llll;
 
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<pair<int, int>> vii;
typedef vector<vii> vvii;
 
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<pair<ll, ll>> vll;
typedef vector<vll> vvll;
 
typedef vector<bool> vb;
 
template <class type1>
using ordered_set = tree<type1, null_type, less<type1>, rb_tree_tag,
                         tree_order_statistics_node_update>;
 
template <typename A, typename B>
ostream &operator<<(ostream &os, const pair<A, B> &p) {
  return os << '(' << p.first << ", " << p.second << ')';
}
template <typename T_container, typename T = typename enable_if<
                                    !is_same<T_container, string>::value,
                                    typename T_container::value_type>::type>
ostream &operator<<(ostream &os, const T_container &v) {
  os << '{';
  string sep;
  for (const T &x : v)
    os << sep << x, sep = ", ";
  return os << '}';
}
 
const ll MOD = 1e9 + 7;
// const ll MOD = 998244353;
const ll INF = 1e18;
const ld EPS = 1e-9;
 
struct ST {
  const int MAXLG = 22;
  int n;
  vvl t;
  vl lg2;
 
  ST(vl &a) : n(a.size()) {
    t = vvl(MAXLG, vl(n));
    t[0] = a;
 
    for (int j = 1; j < MAXLG; j++)
      for (int i = 0; i + (1 << j) <= n; i++)
        t[j][i] = max(t[j - 1][i], t[j - 1][i + (1 << (j - 1))]);
 
    lg2 = vl(n + 10);
    lg2[1] = 0;
    for (int i = 2; i <= n; i++)
      lg2[i] = lg2[i / 2] + 1;
  }
 
  ll query(int l, int r) {
    if (l > r)
      swap(l, r);
 
    int k = lg2[r - l + 1];
    return max(t[k][l], t[k][r - (1 << k) + 1]);
  }
};
 
void solve() {
  int n, k;
  cin >> n >> k;
  vl a(n);
  for (ll &x : a)
    cin >> x;
 
  ST st(a);
 
  vvl dp(k + 1, vl(n, INF));
  for (int i = 0; i < n; i++)
    dp[1][i] = i == 0 ? a[i] : max(a[i], dp[1][i - 1]);
 
  function<void(int, int, int, int, int)> f = [&](int l, int r, int k,
                                                  int opt_l, int opt_r) {
    if (l > r)
      return;
 
    int mid = (l + r) / 2;
    llll best = {INF, INF};
 
    for (int i = max(opt_l - 70, k - 1); i <= min(mid, opt_r + 70); i++)
      best = min(best, {dp[k - 1][i - 1] + st.query(i, mid), i});
 
    assert(best.second != INF);
 
    dp[k][mid] = best.first;
    f(l, mid - 1, k, opt_l, best.second);
    f(mid + 1, r, k, best.second, opt_r);
  };
 
  for (int kk = 2; kk <= k; kk++)
    f(kk - 1, n - 1, kk, 0, n - 1);
 
  cout << dp[k].back() << '\n';
}
 
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(NULL);
 
  clock_t start = clock();
 
  int test_cases = 1;
  // cin >> test_cases;
 
  while (test_cases--)
    solve();
 
#ifdef DEBUG
  cerr << fixed << setprecision(10)
       << "\nTime Taken: " << (double)(clock() - start) / CLOCKS_PER_SEC
       << "s\n";
#endif
  return 0;
}

Compilation message (stderr)

blocks.cpp: In function 'int main()':
blocks.cpp:162:11: warning: unused variable 'start' [-Wunused-variable]
  162 |   clock_t start = clock();
      |           ^~~~~

• Subtask 1: 0 / 14
• Subtask 2: 18 / 18
• Subtask 3: 0 / 21
• Subtask 4: 0 / 47