oj.uz

Submission #892523

# Submission time Handle Problem Language Result Execution time Memory
892523 2023-12-25T13:08:59 Z MilosMilutinovic Bulldozer (JOI17_bulldozer) C++14
75 / 100
 1018 ms 35520 KB 
#include <bits/stdc++.h>
 
using namespace std;
 
struct pt {
  int x, y;
};
 
bool same(int x1, int y1, int x2, int y2) {
  // y1 / x1 = y2 / x2
  return x1 * 1LL * y2 == y1 * 1LL * x2;
}

long long cross(pt a, pt b) {
  return a.x * 1LL * b.y - a.y * 1LL * b.x;
}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  vector<int> x(n), y(n), w(n);
  for (int i = 0; i < n; i++) {
    cin >> x[i] >> y[i] >> w[i];
  }
  vector<int> order(n);
  iota(order.begin(), order.end(), 0);
  sort(order.begin(), order.end(), [&](int i, int j) {
    if (y[i] != y[j]) {
      return y[i] < y[j];
    } else {
      return x[i] < x[j];
    }
  });
  vector<int> pos(n);
  for (int i = 0; i < n; i++) {
    pos[order[i]] = i;
  }
  vector<long long> mx(4 * n);
  vector<long long> sum(4 * n);
  vector<long long> pref(4 * n);
  vector<long long> suff(4 * n);
  auto Pull = [&](int x) {
    sum[x] = sum[x << 1] + sum[x << 1 | 1];
    mx[x] = max({mx[x << 1], mx[x << 1 | 1], suff[x << 1] + pref[x << 1 | 1]});
    pref[x] = max(pref[x << 1], sum[x << 1] + pref[x << 1 | 1]);
    suff[x] = max(suff[x << 1 | 1], sum[x << 1 | 1] + suff[x << 1]);
  };
  function<void(int, int, int)> Build = [&](int x, int l, int r) {
    if (l == r) {
      sum[x] = w[order[l]];
      mx[x] = max(0LL, sum[x]);
      pref[x] = max(0LL, sum[x]);
      suff[x] = max(0LL, sum[x]);
      return;
    }
    int mid = l + r >> 1;
    Build(x << 1, l, mid);
    Build(x << 1 | 1, mid + 1, r);
    Pull(x);
  };
  function<void(int, int, int, int)> Update = [&](int x, int l, int r, int p) {
    if (l == r) {
      sum[x] = w[order[l]];
      mx[x] = max(0LL, sum[x]);
      pref[x] = max(0LL, sum[x]);
      suff[x] = max(0LL, sum[x]);
      return;
    }
    int mid = l + r >> 1;
    if (p <= mid) {
      Update(x << 1, l, mid, p);
    } else {
      Update(x << 1 | 1, mid + 1, r, p);
    }
    Pull(x);
  };
  Build(1, 0, n - 1);
  vector<array<int, 4>> qs;
  for (int i = 0; i < n; i++) {
    for (int j = i + 1; j < n; j++) {
      int fx = x[j] - x[i];
      int fy = y[j] - y[i];
      if (fy < 0 || (fy == 0 && fx < 0)) {
        fx = -fx;
        fy = -fy;
      }
      qs.push_back({fx, fy, i, j});
    }
  }
  sort(qs.begin(), qs.end(), [&](array<int, 4> a, array<int, 4> b) {
    pt p;
    p.x = a[0];
    p.y = a[1];
    pt q;
    q.x = b[0];
    q.y = b[1];
    if (cross(p, q) == 0) {
      return make_pair(a[2], a[3]) < make_pair(b[2], b[3]);
    }
    return cross(p, q) > 0;
  });
  int sz = (int) qs.size();
  long long ans = mx[1];
  for (int i = 0; i < sz; i++) {
    int ptr = i;
    while (ptr < sz && same(qs[i][0], qs[i][1], qs[ptr][0], qs[ptr][1])) {
      swap(order[pos[qs[ptr][2]]], order[pos[qs[ptr][3]]]);
      swap(pos[qs[ptr][2]], pos[qs[ptr][3]]);
      Update(1, 0, n - 1, pos[qs[ptr][2]]);
      Update(1, 0, n - 1, pos[qs[ptr][3]]);
      ptr += 1;
    }
    ans = max(ans, mx[1]);
    i = ptr - 1;
  }
  cout << ans << '\n';
  return 0;
}

Compilation message

bulldozer.cpp: In lambda function:
bulldozer.cpp:58:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   58 |     int mid = l + r >> 1;
      |               ~~^~~
bulldozer.cpp: In lambda function:
bulldozer.cpp:71:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   71 |     int mid = l + r >> 1;
      |               ~~^~~

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 604 KB Output is correct
2 Correct 1 ms 604 KB Output is correct
3 Correct 1 ms 684 KB Output is correct
4 Correct 2 ms 600 KB Output is correct
5 Incorrect 1 ms 604 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 604 KB Output is correct
2 Correct 2 ms 604 KB Output is correct
3 Correct 2 ms 604 KB Output is correct
4 Correct 2 ms 604 KB Output is correct
5 Correct 2 ms 604 KB Output is correct
6 Correct 2 ms 604 KB Output is correct
7 Correct 2 ms 604 KB Output is correct
8 Correct 2 ms 604 KB Output is correct
9 Correct 2 ms 604 KB Output is correct
10 Correct 2 ms 604 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 1 ms 344 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 2 ms 604 KB Output is correct
22 Correct 2 ms 604 KB Output is correct
23 Correct 2 ms 604 KB Output is correct
24 Correct 2 ms 604 KB Output is correct
25 Correct 2 ms 604 KB Output is correct
26 Correct 2 ms 600 KB Output is correct
27 Correct 2 ms 604 KB Output is correct
28 Correct 3 ms 604 KB Output is correct
29 Correct 2 ms 600 KB Output is correct
30 Correct 2 ms 604 KB Output is correct
31 Correct 2 ms 604 KB Output is correct
32 Correct 2 ms 604 KB Output is correct

Subtask #3
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 604 KB Output is correct
2 Correct 2 ms 604 KB Output is correct
3 Correct 2 ms 604 KB Output is correct
4 Correct 2 ms 604 KB Output is correct
5 Correct 2 ms 604 KB Output is correct
6 Correct 2 ms 604 KB Output is correct
7 Correct 2 ms 604 KB Output is correct
8 Correct 2 ms 604 KB Output is correct
9 Correct 2 ms 604 KB Output is correct
10 Correct 2 ms 604 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 1 ms 344 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 2 ms 604 KB Output is correct
22 Correct 2 ms 604 KB Output is correct
23 Correct 2 ms 604 KB Output is correct
24 Correct 2 ms 604 KB Output is correct
25 Correct 2 ms 604 KB Output is correct
26 Correct 2 ms 600 KB Output is correct
27 Correct 2 ms 604 KB Output is correct
28 Correct 3 ms 604 KB Output is correct
29 Correct 2 ms 600 KB Output is correct
30 Correct 2 ms 604 KB Output is correct
31 Correct 2 ms 604 KB Output is correct
32 Correct 2 ms 604 KB Output is correct
33 Correct 955 ms 35520 KB Output is correct
34 Correct 956 ms 35008 KB Output is correct
35 Correct 953 ms 35520 KB Output is correct
36 Correct 953 ms 34520 KB Output is correct
37 Correct 967 ms 34852 KB Output is correct
38 Correct 952 ms 35516 KB Output is correct
39 Correct 947 ms 33984 KB Output is correct
40 Correct 962 ms 34236 KB Output is correct
41 Correct 952 ms 35248 KB Output is correct
42 Correct 951 ms 34072 KB Output is correct
43 Correct 940 ms 33724 KB Output is correct
44 Correct 966 ms 34240 KB Output is correct
45 Correct 942 ms 33980 KB Output is correct
46 Correct 952 ms 34832 KB Output is correct
47 Correct 940 ms 35008 KB Output is correct
48 Correct 955 ms 34752 KB Output is correct
49 Correct 947 ms 34496 KB Output is correct
50 Correct 944 ms 34736 KB Output is correct
51 Correct 950 ms 34780 KB Output is correct
52 Correct 948 ms 33728 KB Output is correct
53 Correct 949 ms 33984 KB Output is correct
54 Correct 949 ms 33712 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 604 KB Output is correct
2 Correct 2 ms 604 KB Output is correct
3 Correct 2 ms 604 KB Output is correct
4 Correct 2 ms 604 KB Output is correct
5 Correct 2 ms 604 KB Output is correct
6 Correct 2 ms 604 KB Output is correct
7 Correct 2 ms 604 KB Output is correct
8 Correct 2 ms 604 KB Output is correct
9 Correct 2 ms 604 KB Output is correct
10 Correct 2 ms 604 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 1 ms 344 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 2 ms 604 KB Output is correct
22 Correct 2 ms 604 KB Output is correct
23 Correct 2 ms 604 KB Output is correct
24 Correct 2 ms 604 KB Output is correct
25 Correct 2 ms 604 KB Output is correct
26 Correct 2 ms 600 KB Output is correct
27 Correct 2 ms 604 KB Output is correct
28 Correct 3 ms 604 KB Output is correct
29 Correct 2 ms 600 KB Output is correct
30 Correct 2 ms 604 KB Output is correct
31 Correct 2 ms 604 KB Output is correct
32 Correct 2 ms 604 KB Output is correct
33 Correct 955 ms 35520 KB Output is correct
34 Correct 956 ms 35008 KB Output is correct
35 Correct 953 ms 35520 KB Output is correct
36 Correct 953 ms 34520 KB Output is correct
37 Correct 967 ms 34852 KB Output is correct
38 Correct 952 ms 35516 KB Output is correct
39 Correct 947 ms 33984 KB Output is correct
40 Correct 962 ms 34236 KB Output is correct
41 Correct 952 ms 35248 KB Output is correct
42 Correct 951 ms 34072 KB Output is correct
43 Correct 940 ms 33724 KB Output is correct
44 Correct 966 ms 34240 KB Output is correct
45 Correct 942 ms 33980 KB Output is correct
46 Correct 952 ms 34832 KB Output is correct
47 Correct 940 ms 35008 KB Output is correct
48 Correct 955 ms 34752 KB Output is correct
49 Correct 947 ms 34496 KB Output is correct
50 Correct 944 ms 34736 KB Output is correct
51 Correct 950 ms 34780 KB Output is correct
52 Correct 948 ms 33728 KB Output is correct
53 Correct 949 ms 33984 KB Output is correct
54 Correct 949 ms 33712 KB Output is correct
55 Correct 972 ms 33720 KB Output is correct
56 Correct 956 ms 35516 KB Output is correct
57 Correct 951 ms 33980 KB Output is correct
58 Correct 950 ms 34496 KB Output is correct
59 Correct 987 ms 33724 KB Output is correct
60 Correct 1018 ms 35264 KB Output is correct
61 Correct 977 ms 34240 KB Output is correct
62 Correct 952 ms 33984 KB Output is correct
63 Correct 952 ms 35516 KB Output is correct
64 Correct 951 ms 34492 KB Output is correct
65 Correct 976 ms 35512 KB Output is correct
66 Correct 955 ms 33984 KB Output is correct
67 Correct 950 ms 35516 KB Output is correct
68 Correct 973 ms 35008 KB Output is correct
69 Correct 949 ms 34488 KB Output is correct
70 Correct 958 ms 35264 KB Output is correct
71 Correct 949 ms 35260 KB Output is correct
72 Correct 948 ms 35520 KB Output is correct
73 Correct 1014 ms 34240 KB Output is correct
74 Correct 948 ms 34240 KB Output is correct

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 604 KB Output is correct
2 Correct 1 ms 604 KB Output is correct
3 Correct 1 ms 684 KB Output is correct
4 Correct 2 ms 600 KB Output is correct
5 Incorrect 1 ms 604 KB Output isn't correct
6 Halted 0 ms 0 KB -