oj.uz

Submission #389342

# Submission time Handle Problem Language Result Execution time Memory
389342 2021-04-14T03:16:42 Z VROOM_VARUN Watching (JOI13_watching) C++14
100 / 100
 126 ms 16076 KB 
/*
ID: varunra2
LANG: C++
TASK: watching
*/

#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

int n, p, q;
VI vals;

VVI dp;
VVI to;

void init() {
  vals.resize(n);
  p = min(p, n);
  q = min(q, n);
  dp.resize(p + 1);
  trav(x, dp) x.resize(q + 1);
  to.resize(n + 1);
  trav(x, to) x.resize(2);
}

bool works(int w, bool deb = false) {
  if (p + q >= n) return true;
  trav(x, dp) trav(y, x) y = 0;
  trav(x, to) trav(y, x) y = 0;

  for (int i = 0; i < n; i++) {
    for (int j = 0; j < 2; j++) {
      int too = vals[i] + (j + 1) * w;
      int ind = lower_bound(all(vals), too) - vals.begin();
      to[i][j] = ind;
    }
  }

  for (int i = 0; i <= p; i++) {
    for (int j = 0; j <= q; j++) {
      if (dp[i][j] == n) {
        return true;
      }
      if (i < p) {
        int ind = to[dp[i][j]][0];
        dp[i + 1][j] = max(dp[i + 1][j], ind);
      }
      if (j < q) {
        int ind = to[dp[i][j]][1];
        dp[i][j + 1] = max(dp[i][j + 1], ind);
      }
    }
  }
  return false;
}

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

  cin >> n >> p >> q;

  init();

  trav(x, vals) cin >> x;

  sort(all(vals));

  int x = -1;

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

  cout << max(1, x + 1) << '\n';

  return 0;
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 424 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 6 ms 9292 KB Output is correct
4 Correct 2 ms 1100 KB Output is correct
5 Correct 1 ms 972 KB Output is correct
6 Correct 10 ms 16076 KB Output is correct
7 Correct 6 ms 332 KB Output is correct
8 Correct 26 ms 804 KB Output is correct
9 Correct 32 ms 716 KB Output is correct
10 Correct 35 ms 1100 KB Output is correct
11 Correct 20 ms 1100 KB Output is correct
12 Correct 126 ms 4172 KB Output is correct
13 Correct 9 ms 332 KB Output is correct
14 Correct 10 ms 460 KB Output is correct
15 Correct 10 ms 460 KB Output is correct