oj.uz

Submission #312334

# Submission time Handle Problem Language Result Execution time Memory
312334 2020-10-13T03:48:14 Z VROOM_VARUN Sparklers (JOI17_sparklers) C++14
0 / 100
 44 ms 8320 KB 
/*
ID: varunra2
LANG: C++
TASK: sparklers
*/

#include <bits/stdc++.h>
using namespace std;

#ifdef DEBUG
#include "lib/debug.h"
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#define debug_arr(...) \
  cerr << "[" << #__VA_ARGS__ << "]:", debug_arr(__VA_ARGS__)
#pragma GCC diagnostic ignored "-Wsign-compare"
//#pragma GCC diagnostic ignored "-Wunused-parameter"
//#pragma GCC diagnostic ignored "-Wunused-variable"
#else
#define debug(...) 42
#endif

#define int long long
#define EPS 1e-9
#define IN(A, B, C) assert(B <= A && A <= C)
#define INF (int)1e9
#define MEM(a, b) memset(a, (b), sizeof(a))
#define MOD 1000000007
#define MP make_pair
#define PB push_back
#define all(cont) cont.begin(), cont.end()
#define rall(cont) cont.end(), cont.begin()
#define x first
#define y second

const double PI = acos(-1.0);
typedef long long ll;
typedef long double ld;
typedef pair<int, int> PII;
typedef map<int, int> MPII;
typedef multiset<int> MSETI;
typedef set<int> SETI;
typedef set<string> SETS;
typedef vector<int> VI;
typedef vector<PII> VII;
typedef vector<VI> VVI;
typedef vector<string> VS;

#define rep(i, a, b) for (int i = a; i < (b); ++i)
#define trav(a, x) for (auto& a : x)
#define sz(x) (int)(x).size()
typedef pair<int, int> pii;
typedef vector<int> vi;
#pragma GCC diagnostic ignored "-Wsign-compare"
// util functions
const int N = 1001;
int n, k, t;
int v;
VI vals;
VVI dp(N, VI(N, -1));

void init() { vals.resize(n); }

bool solve(int l, int r) {
  if (l > k) return false;
  if (r < k) return false;
  if (l == r) return true;

  if (dp[l][r] != -1) return dp[l][r];

  if (vals[r] - vals[l] <= 2 * (r - l) * t * v) {
    if (solve(l, r - 1))
      dp[l][r] = 1;
    else if (solve(l + 1, r))
      dp[l][r] = 1;
    else
      dp[l][r] = 0;
  } else {
    dp[l][r] = 0;
  }

  return dp[l][r];
}

void fll(VVI& dp, int val) { trav(x, dp) trav(y, x) y = val; }

bool works(int _v) {
  v = _v;
  if (v <= 0) return false;
  if (v * t >= vals.back()) return true;
  fll(dp, -1);
  dp[k][k] = 1;
  return solve(0, n - 1);
}

int32_t main() {
  // #ifndef ONLINE_JUDGE
  // freopen("sparklers.in", "r", stdin);
  // freopen("sparklers.out", "w", stdout);
  // #endif
  cin.sync_with_stdio(0);
  cin.tie(0);

  cin >> n >> k >> t;

  if (n == 1) {
    cout << "0\n";
    return 0;
  }

  k--;

  init();

  for (int i = 0; i < n; i++) {
    cin >> vals[i];
  }

  int x = -1;

  for (int b = INF * (int)(1e5) + 1; b >= 1; b /= 2) {
    while (!works(x + b)) x += b;
  }

  // cout << x + 1 << '\n';

  x++;

  for (int i = x - 5; i <= x + 5; i++) {
    if (works(i)) {
      cout << i << '\n';
      return 0;
    }
  }

  return 0;
}

Subtask #1
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 38 ms 8192 KB Output is correct
2 Correct 35 ms 8192 KB Output is correct
3 Correct 39 ms 8192 KB Output is correct
4 Correct 44 ms 8260 KB Output is correct
5 Correct 40 ms 8192 KB Output is correct
6 Correct 38 ms 8264 KB Output is correct
7 Correct 37 ms 8320 KB Output is correct
8 Correct 40 ms 8192 KB Output is correct
9 Correct 39 ms 8192 KB Output is correct
10 Correct 33 ms 8192 KB Output is correct
11 Correct 36 ms 8192 KB Output is correct
12 Correct 34 ms 8192 KB Output is correct
13 Correct 37 ms 8192 KB Output is correct
14 Correct 38 ms 8192 KB Output is correct
15 Correct 39 ms 8192 KB Output is correct
16 Correct 38 ms 8192 KB Output is correct
17 Correct 33 ms 8192 KB Output is correct
18 Correct 39 ms 8192 KB Output is correct
19 Incorrect 5 ms 8192 KB Output isn't correct
20 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 38 ms 8192 KB Output is correct
2 Correct 35 ms 8192 KB Output is correct
3 Correct 39 ms 8192 KB Output is correct
4 Correct 44 ms 8260 KB Output is correct
5 Correct 40 ms 8192 KB Output is correct
6 Correct 38 ms 8264 KB Output is correct
7 Correct 37 ms 8320 KB Output is correct
8 Correct 40 ms 8192 KB Output is correct
9 Correct 39 ms 8192 KB Output is correct
10 Correct 33 ms 8192 KB Output is correct
11 Correct 36 ms 8192 KB Output is correct
12 Correct 34 ms 8192 KB Output is correct
13 Correct 37 ms 8192 KB Output is correct
14 Correct 38 ms 8192 KB Output is correct
15 Correct 39 ms 8192 KB Output is correct
16 Correct 38 ms 8192 KB Output is correct
17 Correct 33 ms 8192 KB Output is correct
18 Correct 39 ms 8192 KB Output is correct
19 Incorrect 5 ms 8192 KB Output isn't correct
20 Halted 0 ms 0 KB -

Subtask #3
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 38 ms 8192 KB Output is correct
2 Correct 35 ms 8192 KB Output is correct
3 Correct 39 ms 8192 KB Output is correct
4 Correct 44 ms 8260 KB Output is correct
5 Correct 40 ms 8192 KB Output is correct
6 Correct 38 ms 8264 KB Output is correct
7 Correct 37 ms 8320 KB Output is correct
8 Correct 40 ms 8192 KB Output is correct
9 Correct 39 ms 8192 KB Output is correct
10 Correct 33 ms 8192 KB Output is correct
11 Correct 36 ms 8192 KB Output is correct
12 Correct 34 ms 8192 KB Output is correct
13 Correct 37 ms 8192 KB Output is correct
14 Correct 38 ms 8192 KB Output is correct
15 Correct 39 ms 8192 KB Output is correct
16 Correct 38 ms 8192 KB Output is correct
17 Correct 33 ms 8192 KB Output is correct
18 Correct 39 ms 8192 KB Output is correct
19 Incorrect 5 ms 8192 KB Output isn't correct
20 Halted 0 ms 0 KB -