oj.uz

Submission #312317

# Submission time Handle Problem Language Result Execution time Memory
312317 2020-10-13T03:18:01 Z VROOM_VARUN Sparklers (JOI17_sparklers) C++14
0 / 100
 27 ms 4472 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 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) {
  int& ret = dp[l][r];
  if (ret != -1) return ret;
  if (l >= r) {
    return ret = 0;
  }
  return ret = ((solve(l + 1, r) or solve(l, r - 1)) and
                (vals[r] - vals[l] + v - 1) / v <= 2ll * (r - l) * t);
}

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

bool works(int _v) {
  if (_v >= 2 * INF) return true;
  if (_v == 0) return false;
  fll(dp, -1);
  dp[k][k] = 1;
  v = _v;
  return solve(0, n - 1);
}

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

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

  return 0;
}

Compilation message

sparklers.cpp: In function 'bool solve(int, int)':
sparklers.cpp:66:16: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   66 |     return ret = 0;
      |            ~~~~^~~
sparklers.cpp:68:14: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   68 |   return ret = ((solve(l + 1, r) or solve(l, r - 1)) and
      |          ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   69 |                 (vals[r] - vals[l] + v - 1) / v <= 2ll * (r - l) * t);
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 26 ms 4352 KB Output is correct
2 Correct 23 ms 4224 KB Output is correct
3 Correct 22 ms 4352 KB Output is correct
4 Correct 23 ms 4352 KB Output is correct
5 Correct 25 ms 4224 KB Output is correct
6 Correct 25 ms 4472 KB Output is correct
7 Correct 24 ms 4352 KB Output is correct
8 Correct 27 ms 4344 KB Output is correct
9 Correct 22 ms 4352 KB Output is correct
10 Correct 23 ms 4352 KB Output is correct
11 Correct 20 ms 4352 KB Output is correct
12 Correct 23 ms 4352 KB Output is correct
13 Correct 24 ms 4348 KB Output is correct
14 Correct 22 ms 4352 KB Output is correct
15 Correct 22 ms 4352 KB Output is correct
16 Correct 22 ms 4352 KB Output is correct
17 Correct 23 ms 4352 KB Output is correct
18 Correct 22 ms 4224 KB Output is correct
19 Incorrect 22 ms 4352 KB Output isn't correct
20 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 26 ms 4352 KB Output is correct
2 Correct 23 ms 4224 KB Output is correct
3 Correct 22 ms 4352 KB Output is correct
4 Correct 23 ms 4352 KB Output is correct
5 Correct 25 ms 4224 KB Output is correct
6 Correct 25 ms 4472 KB Output is correct
7 Correct 24 ms 4352 KB Output is correct
8 Correct 27 ms 4344 KB Output is correct
9 Correct 22 ms 4352 KB Output is correct
10 Correct 23 ms 4352 KB Output is correct
11 Correct 20 ms 4352 KB Output is correct
12 Correct 23 ms 4352 KB Output is correct
13 Correct 24 ms 4348 KB Output is correct
14 Correct 22 ms 4352 KB Output is correct
15 Correct 22 ms 4352 KB Output is correct
16 Correct 22 ms 4352 KB Output is correct
17 Correct 23 ms 4352 KB Output is correct
18 Correct 22 ms 4224 KB Output is correct
19 Incorrect 22 ms 4352 KB Output isn't correct
20 Halted 0 ms 0 KB -

Subtask #3
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 26 ms 4352 KB Output is correct
2 Correct 23 ms 4224 KB Output is correct
3 Correct 22 ms 4352 KB Output is correct
4 Correct 23 ms 4352 KB Output is correct
5 Correct 25 ms 4224 KB Output is correct
6 Correct 25 ms 4472 KB Output is correct
7 Correct 24 ms 4352 KB Output is correct
8 Correct 27 ms 4344 KB Output is correct
9 Correct 22 ms 4352 KB Output is correct
10 Correct 23 ms 4352 KB Output is correct
11 Correct 20 ms 4352 KB Output is correct
12 Correct 23 ms 4352 KB Output is correct
13 Correct 24 ms 4348 KB Output is correct
14 Correct 22 ms 4352 KB Output is correct
15 Correct 22 ms 4352 KB Output is correct
16 Correct 22 ms 4352 KB Output is correct
17 Correct 23 ms 4352 KB Output is correct
18 Correct 22 ms 4224 KB Output is correct
19 Incorrect 22 ms 4352 KB Output isn't correct
20 Halted 0 ms 0 KB -