oj.uz

Submission #1074432

# Submission time Handle Problem Language Result Execution time Memory
1074432 2024-08-25T10:30:15 Z joelgun14 Growing Vegetables is Fun 5 (JOI24_vegetables5) C++17
67 / 100
 5000 ms 48604 KB 
// header file
#include <bits/stdc++.h>
// pragma
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
// macros
// #define endl "\n"
#define ll long long
#define mp make_pair
#define ins insert
#define lb lower_bound
#define pb push_back
#define ub upper_bound
#define lll __int128
#define fi first
#define se second
using namespace std;
const int lim = 6e5 + 5;
struct fenwick {
  int a[lim];
  fenwick() {
    memset(a, 0, sizeof(a));
  }
  void update(int idx, int val) {
    // cerr << idx << endl;
    assert(idx > 0);
    while(idx < lim) {
      a[idx] += val;
      idx += idx&-idx;
    }
  }
  void update(int l, int r, int val) {
    if(l > r)
      return;
    update(l, val);
    update(r + 1, -val);
  }
  int query(int idx) {
    if(idx >= lim)
      idx = lim - 1;
    int res = 0;
    while(idx) {
      res += a[idx];
      idx -= idx&-idx;
    }
    return res;
  }
} cur;
struct disjoint_setr {
  int h[lim];
  void reset() {
    memset(h, -1, sizeof(h));
  }
  disjoint_setr() {
    reset();
  }
  int nxt(int x) {
    return h[x] == -1 ? x : h[x] = nxt(h[x]);
  }
  void erase(int x) {
    merge(x, x + 1);
  }
  void merge(int x, int y) {
    x = nxt(x), y = nxt(y);
    if(x != y) {
      if(x < y)
        swap(x, y);
      h[y] = x;
    }
  }
} redr, bluer;
struct disjoint_setl {
  int h[lim];
  void reset() {
    memset(h, -1, sizeof(h));
  }
  disjoint_setl() {
    reset();
  }
  int prv(int x) {
    return h[x] == -1 ? x : h[x] = prv(h[x]);
  }
  void erase(int x) {
    merge(x - 1, x);
  }
  void merge(int x, int y) {
    x = prv(x), y = prv(y);
    if(x != y) {
      if(x > y)
        swap(x, y);
      h[y] = x;
    }
  }
} redl, bluel;
int main() {
  ios_base::sync_with_stdio(0); cin.tie(NULL);
  int n;
  cin >> n;
  int a[2 * n + 5];
  for(int i = 1; i <= 2 * n; ++i)
    cin >> a[i];
  int b[n + 5], c[n + 5];
  for(int i = 1; i <= n; ++i)
    cin >> b[i];
  for(int i = 1; i <= n; ++i)
    cin >> c[i];
  sort(b + 1, b + n + 1);
  sort(c + 1, c + n + 1);
  int l = 0, r = 1e9, res = -1;
  vector<pair<int, int>> v;
  for(int i = 1; i <= 2 * n; ++i)
    v.pb(mp(a[i], i));
  sort(v.begin(), v.end());
  while(l <= r) {
    memset(cur.a, 0, sizeof(cur.a));
    redl.reset();
    redr.reset();
    bluel.reset();
    bluer.reset();
    int mid = (l + r) >> 1;
    // max diff -> mid
    // try each partition what is the max diff
    // nanti ada banyak validity test, tinggal cek validity testnya mana aja
    pair<int, int> validb[2 * n + 5], validr[2 * n + 5];
    for(int i = 1; i <= 2 * n; ++i) {
      // idx of element >= a[i] - mid
      validb[i].fi = lower_bound(b + 1, b + n + 1, a[i] - mid) - b;
      // idx of element <= a[i] + mid
      validb[i].se = upper_bound(b + 1, b + n + 1, a[i] + mid) - b - 1;
      // idx of element >= a[i] - mid
      validr[i].fi = lower_bound(c + 1, c + n + 1, a[i] - mid) - c;
      // idx of element <= a[i] + mid
      validr[i].se = upper_bound(c + 1, c + n + 1, a[i] + mid) - c - 1;
      // if(mid == 1) {
      //   cerr << a[i] + mid << " " << upper_bound(c + 1, c + n + 1, a[i] + mid) - c - 1 << " " << validr[i].se << endl;
      // }
    }
    // cerr << "TEST" << endl;
    for(auto p : v) {
      // process
      // cerr << "UPDATE" << endl;
      cur.update(max(1, p.se - n + 1), p.se, 1);
      // observe that blue on left/right of that segment can be invalid
      int idx = p.se;
      // cerr << "TEST" << endl;
      int val;
      while((val = bluer.nxt(max(1, p.se - n + 1))) <= p.se && val > 0) {
        int tmp2 = cur.query(val);
        if(tmp2 < validb[idx].fi || tmp2 > validb[idx].se)
          bluer.erase(val), bluel.erase(val);
        else
          break;
      }
      while((val = bluel.prv(p.se)) >= max(1, p.se - n + 1)) {
        int tmp2 = cur.query(val);
        if(tmp2 < validb[idx].fi || tmp2 > validb[idx].se)
          bluer.erase(val), bluel.erase(val);
        else
          break;
      }
      // cerr << "DONE" << endl;
      if(p.se <= n) {
        cur.update(p.se + n + 1, 2 * n, 1);
        // observe that blue on left/right of that segment can be invalid
        while((val = bluer.nxt(p.se + n + 1)) <= 2 * n) {
          // cerr << val << endl;
          int tmp2 = cur.query(val);
          // cerr << "AFTER" << endl;
          if(tmp2 < validb[idx].fi || tmp2 > validb[idx].se) {
            bluer.erase(val), bluel.erase(val);
            // cerr << "HERE" << endl;
          }
          else
            break;
        }
        // cerr << "CHECK" << endl;
        while((val = bluel.prv(2 * n)) >= p.se + n + 1) {
          // cerr << val << endl;
          int tmp2 = cur.query(val);
          if(tmp2 < validb[idx].fi || tmp2 > validb[idx].se)
            bluer.erase(val), bluel.erase(val);
          else
            break;
        } 
      }
      // cerr << "TEST2" << endl;
      while((val = redr.nxt(max(1, p.se - n + 1))) <= p.se && val > 0) {
        // cerr << "check " << *it << " due to " << p.se << " " << cur.query(*it) << " " << validr[idx].fi << endl; 
        int tmp2 = cur.query(val);
        if(tmp2 < validr[idx].fi || tmp2 > validr[idx].se)
          redr.erase(val), redl.erase(val);
        else
          break;
      }
      while((val = redl.prv(p.se)) >= max(1, p.se - n + 1)) {
        // cerr << "check " << *it << " due to " << p.se << " " << cur.query(*it) << " " << validr[idx].se << endl; 
        int tmp2 = cur.query(val);
        if(tmp2 < validr[idx].fi || tmp2 > validr[idx].se)
          redr.erase(val), redl.erase(val);
        else
          break;
      }
      if(p.se <= n) {
        // observe that red on left/right of that segment can be invalid
        while((val = redr.nxt(p.se + n + 1)) <= 2 * n) {
          // cerr << "check " << *it << " due to " << p.se << " " << cur.query(*it) << " " << validr[idx].fi << endl; 
          int tmp2 = cur.query(val);
          if(tmp2 < validr[idx].fi || tmp2 > validr[idx].se)
            redr.erase(val), redl.erase(val);
          else
            break;
        }
        while((val = redl.prv(2 * n)) >= p.se + n + 1) {
          // cerr << "check " << *it << " due to " << p.se << " " << cur.query(*it) << " " << validr[idx].se << endl; 
          int tmp2 = cur.query(val);
          if(tmp2 < validr[idx].fi || tmp2 > validr[idx].se)
            redr.erase(val), redl.erase(val);
          else
            break;
        } 
      }
      // cerr << "FINISH" << endl;
    }
    // blue and red have to complement each other
    bool ans = 0;
    // cerr << "MID IS " << mid << endl;
    for(int i = 1; i + n <= 2 * n; ++i) {
      // cerr << i << " " << i + n << endl;
      // cerr << bluel.prv(i) << " " << bluel.prv(i + n) << endl;
      // cerr << redl.prv(i) << " " << redl.prv(i + n) << endl;
      if((bluel.prv(i) == i && redl.prv(i + n) == i + n) || (redl.prv(i) == i && bluel.prv(i + n) == i + n))
        ans = 1;
      // cerr << "DONE" << endl;
    }
    /*
    if(mid <= 20) {
      cerr << "DEBUG " << mid << endl;
      for(auto x : red) {
        cerr << x << " ";
      }
      cerr << endl;
      for(auto x : blue) {
        cerr << x << " ";
      }
      cerr << endl;
    }
    */
    if(ans) 
      r = mid - 1, res = mid;
    else
      l = mid + 1;
  }
  cout << res << endl;
  // choose a contiguous segment L to R such that we use one color
  // N^2 approach -> pair greedily (sorted)
  // int res = 1e9;
  // for(int i = 1; i + n <= 2 * n + 1; ++i) {
  //   vector<int> blue, red;
  //   for(int j = 1; j < i; ++j) {
  //     blue.pb(a[j]);
  //   }
  //   for(int j = i; j < i + n; ++j) {
  //     red.pb(a[j]);
  //   }
  //   for(int j = i + n; j <= 2 * n; ++j) {
  //     blue.pb(a[j]);
  //   }
  //   sort(blue.begin(), blue.end());
  //   sort(red.begin(), red.end());
  //   int mx = 0;
  //   for(int k = 1; k <= n; ++k) {
  //     mx = max({mx, abs(blue[k - 1] - b[k]), abs(red[k - 1] - c[k])});
  //   }
  //   res = min(res, mx);
  //   mx = 0;
  //   swap(red, blue);
  //   for(int k = 1; k <= n; ++k) {
  //     mx = max({mx, abs(blue[k - 1] - b[k]), abs(red[k - 1] - c[k])});
  //   }
  //   res = min(res, mx);
  // }
  // cout << res << endl;
  return 0;
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 12124 KB Output is correct
2 Correct 9 ms 12124 KB Output is correct
3 Correct 8 ms 12200 KB Output is correct
4 Correct 9 ms 12124 KB Output is correct
5 Correct 9 ms 12200 KB Output is correct
6 Correct 9 ms 12124 KB Output is correct
7 Correct 8 ms 12124 KB Output is correct
8 Correct 8 ms 12124 KB Output is correct
9 Correct 8 ms 12192 KB Output is correct
10 Correct 9 ms 12124 KB Output is correct
11 Correct 10 ms 12124 KB Output is correct
12 Correct 9 ms 12196 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 12124 KB Output is correct
2 Correct 9 ms 12124 KB Output is correct
3 Correct 8 ms 12200 KB Output is correct
4 Correct 9 ms 12124 KB Output is correct
5 Correct 9 ms 12200 KB Output is correct
6 Correct 9 ms 12124 KB Output is correct
7 Correct 8 ms 12124 KB Output is correct
8 Correct 8 ms 12124 KB Output is correct
9 Correct 8 ms 12192 KB Output is correct
10 Correct 9 ms 12124 KB Output is correct
11 Correct 10 ms 12124 KB Output is correct
12 Correct 9 ms 12196 KB Output is correct
13 Correct 10 ms 12120 KB Output is correct
14 Correct 8 ms 12124 KB Output is correct
15 Correct 9 ms 12196 KB Output is correct
16 Correct 9 ms 12124 KB Output is correct
17 Correct 9 ms 12196 KB Output is correct
18 Correct 9 ms 12124 KB Output is correct
19 Correct 9 ms 12124 KB Output is correct
20 Correct 10 ms 12192 KB Output is correct
21 Correct 8 ms 12124 KB Output is correct
22 Correct 9 ms 12124 KB Output is correct
23 Correct 11 ms 12196 KB Output is correct
24 Correct 8 ms 12124 KB Output is correct
25 Correct 8 ms 12196 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 12124 KB Output is correct
2 Correct 9 ms 12124 KB Output is correct
3 Correct 8 ms 12200 KB Output is correct
4 Correct 9 ms 12124 KB Output is correct
5 Correct 9 ms 12200 KB Output is correct
6 Correct 9 ms 12124 KB Output is correct
7 Correct 8 ms 12124 KB Output is correct
8 Correct 8 ms 12124 KB Output is correct
9 Correct 8 ms 12192 KB Output is correct
10 Correct 9 ms 12124 KB Output is correct
11 Correct 10 ms 12124 KB Output is correct
12 Correct 9 ms 12196 KB Output is correct
13 Correct 10 ms 12120 KB Output is correct
14 Correct 8 ms 12124 KB Output is correct
15 Correct 9 ms 12196 KB Output is correct
16 Correct 9 ms 12124 KB Output is correct
17 Correct 9 ms 12196 KB Output is correct
18 Correct 9 ms 12124 KB Output is correct
19 Correct 9 ms 12124 KB Output is correct
20 Correct 10 ms 12192 KB Output is correct
21 Correct 8 ms 12124 KB Output is correct
22 Correct 9 ms 12124 KB Output is correct
23 Correct 11 ms 12196 KB Output is correct
24 Correct 8 ms 12124 KB Output is correct
25 Correct 8 ms 12196 KB Output is correct
26 Correct 34 ms 12124 KB Output is correct
27 Correct 38 ms 12124 KB Output is correct
28 Correct 34 ms 12376 KB Output is correct
29 Correct 11 ms 12376 KB Output is correct
30 Correct 38 ms 12368 KB Output is correct
31 Correct 37 ms 12124 KB Output is correct
32 Correct 21 ms 12284 KB Output is correct
33 Correct 15 ms 12124 KB Output is correct
34 Correct 30 ms 12352 KB Output is correct
35 Correct 31 ms 12124 KB Output is correct
36 Correct 39 ms 12124 KB Output is correct
37 Correct 32 ms 12124 KB Output is correct
38 Correct 29 ms 12124 KB Output is correct
39 Correct 37 ms 12600 KB Output is correct
40 Correct 37 ms 12124 KB Output is correct

Subtask #4
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 4569 ms 33888 KB Output is correct
2 Correct 4465 ms 43044 KB Output is correct
3 Correct 4116 ms 37056 KB Output is correct
4 Correct 4264 ms 47000 KB Output is correct
5 Correct 3918 ms 44448 KB Output is correct
6 Correct 135 ms 13112 KB Output is correct
7 Correct 3512 ms 48604 KB Output is correct
8 Correct 3974 ms 39604 KB Output is correct
9 Correct 4257 ms 48208 KB Output is correct
10 Correct 4051 ms 46104 KB Output is correct
11 Correct 4173 ms 47436 KB Output is correct
12 Correct 4300 ms 45492 KB Output is correct
13 Correct 4436 ms 43120 KB Output is correct
14 Correct 4406 ms 46264 KB Output is correct
15 Correct 4307 ms 41340 KB Output is correct
16 Correct 4089 ms 42532 KB Output is correct

Subtask #5
0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 12124 KB Output is correct
2 Correct 9 ms 12124 KB Output is correct
3 Correct 8 ms 12200 KB Output is correct
4 Correct 9 ms 12124 KB Output is correct
5 Correct 9 ms 12200 KB Output is correct
6 Correct 9 ms 12124 KB Output is correct
7 Correct 8 ms 12124 KB Output is correct
8 Correct 8 ms 12124 KB Output is correct
9 Correct 8 ms 12192 KB Output is correct
10 Correct 9 ms 12124 KB Output is correct
11 Correct 10 ms 12124 KB Output is correct
12 Correct 9 ms 12196 KB Output is correct
13 Correct 10 ms 12120 KB Output is correct
14 Correct 8 ms 12124 KB Output is correct
15 Correct 9 ms 12196 KB Output is correct
16 Correct 9 ms 12124 KB Output is correct
17 Correct 9 ms 12196 KB Output is correct
18 Correct 9 ms 12124 KB Output is correct
19 Correct 9 ms 12124 KB Output is correct
20 Correct 10 ms 12192 KB Output is correct
21 Correct 8 ms 12124 KB Output is correct
22 Correct 9 ms 12124 KB Output is correct
23 Correct 11 ms 12196 KB Output is correct
24 Correct 8 ms 12124 KB Output is correct
25 Correct 8 ms 12196 KB Output is correct
26 Correct 34 ms 12124 KB Output is correct
27 Correct 38 ms 12124 KB Output is correct
28 Correct 34 ms 12376 KB Output is correct
29 Correct 11 ms 12376 KB Output is correct
30 Correct 38 ms 12368 KB Output is correct
31 Correct 37 ms 12124 KB Output is correct
32 Correct 21 ms 12284 KB Output is correct
33 Correct 15 ms 12124 KB Output is correct
34 Correct 30 ms 12352 KB Output is correct
35 Correct 31 ms 12124 KB Output is correct
36 Correct 39 ms 12124 KB Output is correct
37 Correct 32 ms 12124 KB Output is correct
38 Correct 29 ms 12124 KB Output is correct
39 Correct 37 ms 12600 KB Output is correct
40 Correct 37 ms 12124 KB Output is correct
41 Correct 4569 ms 33888 KB Output is correct
42 Correct 4465 ms 43044 KB Output is correct
43 Correct 4116 ms 37056 KB Output is correct
44 Correct 4264 ms 47000 KB Output is correct
45 Correct 3918 ms 44448 KB Output is correct
46 Correct 135 ms 13112 KB Output is correct
47 Correct 3512 ms 48604 KB Output is correct
48 Correct 3974 ms 39604 KB Output is correct
49 Correct 4257 ms 48208 KB Output is correct
50 Correct 4051 ms 46104 KB Output is correct
51 Correct 4173 ms 47436 KB Output is correct
52 Correct 4300 ms 45492 KB Output is correct
53 Correct 4436 ms 43120 KB Output is correct
54 Correct 4406 ms 46264 KB Output is correct
55 Correct 4307 ms 41340 KB Output is correct
56 Correct 4089 ms 42532 KB Output is correct
57 Execution timed out 5042 ms 47160 KB Time limit exceeded
58 Halted 0 ms 0 KB -