oj.uz

답안 #643288

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
643288 2022-09-21T16:59:45 Z valerikk Construction of Highway (JOI18_construction) C++17
100 / 100
 813 ms 21880 KB 
#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

const int N = 1e5 + 7;

int n;
int c[N];
int a[N], b[N];
vector<int> g[N];
int sz[N];
vector<int> order;
int tin[N], tout[N];
int top[N];
int par[N];

void dfs(int u) {
  tin[u] = order.size();
  order.push_back(u);
  
  for (int &v : g[u]) {
    if (sz[v] > sz[g[u][0]]) 
      swap(v, g[u][0]);
  }

  for (int v : g[u]) {
    top[v] = v == g[u][0] ? top[u] : v;
    dfs(v);
  }

  tout[u] = order.size();
}

int mn[4 * N], mx[4 * N], color[4 * N];

void apply(int v, int c) {
  mn[v] = c;
  mx[v] = c;
  color[v] = c;
}

void push(int v) {
  if (color[v] == -1)
    return;

  apply(2 * v, color[v]);
  apply(2 * v + 1, color[v]);
  color[v] = -1;
}

void update(int v, int left, int right, int l, int r, int c) {
  if (left >= r || right <= l)
    return;
  if (left >= l && right <= r) {
    apply(v, c);
    return;
  }

  push(v);

  int mid = (left + right) / 2;

  update(2 * v, left, mid, l, r, c);
  update(2 * v + 1, mid, right, l, r, c);

  mn[v] = min(mn[2 * v], mn[2 * v + 1]);
  mx[v] = max(mx[2 * v], mx[2 * v + 1]);
}

int get_color(int v, int left, int right, int pos) {
  if (color[v] != -1) 
    return color[v];

  if (right - left == 1)
    return c[order[left]];

  int mid = (left + right) / 2;

  if (pos < mid) 
    return get_color(2 * v, left, mid, pos);
  return get_color(2 * v + 1, mid, right, pos);
}

int find_prev(int v, int left, int right, int l, int r, int c) {
  if (left >= r || right <= l || (mn[v] == c && mx[v] == c))
    return -1;
  if (right - left == 1)
    return left;
  
  push(v);

  int mid = (left + right) / 2;

  int res = find_prev(2 * v + 1, mid, right, l, r, c);
  if (res == -1)
    res = find_prev(2 * v, left, mid, l, r, c);

  return res;
}

void build(int v, int left, int right) {
  color[v] = -1;

  if (right - left == 1) {
    mn[v] = mx[v] = c[order[left]];
    return;
  }

  int mid = (left + right) / 2;
  
  build(2 * v, left, mid);
  build(2 * v + 1, mid, right);

  mn[v] = min(mn[2 * v], mn[2 * v + 1]);
  mx[v] = max(mx[2 * v], mx[2 * v + 1]);
}

int fen[N];

void add_fen(int i, int val) {
  for (++i; i < N; i += i & -i) {
    fen[i] += val;
  }
}

int get_fen(int i) {
  int sum = 0;
  for (; i > 0; i -= i & -i) {
    sum += fen[i];
  }
  return sum;
}

long long get_cost(int u) {
  vector<pair<int, int>> segments;

  while (u != -1) {
    int c = get_color(1, 0, n, tin[u]);

    int pos = find_prev(1, 0, n, 0, tin[u] + 1, c);

    if (pos < tin[top[u]]) {
      segments.push_back({c, tin[u] - tin[top[u]] + 1});
      u = par[top[u]];
    } else {
      segments.push_back({c, tin[u] - pos});
      u = order[pos];
    }
  }

  long long res = 0;

  for (auto segment : segments) {
    // cout << segment.first << " " << segment.second << endl;
    res += get_fen(segment.first) * 1LL * segment.second;
    add_fen(segment.first, segment.second);
  }
  for (auto segment : segments) {
    add_fen(segment.first, -segment.second);
  }

  return res; 
}

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

  vector<int> sorted;
  for (int i = 0; i < n; ++i) {
    sorted.push_back(c[i]);
  }
  sort(sorted.begin(), sorted.end());
  for (int i = 0; i < n; ++i) {
    c[i] = lower_bound(sorted.begin(), sorted.end(), c[i]) - sorted.begin();
  }

  for (int i = 0; i < n - 1; ++i) {
    cin >> a[i] >> b[i];
    --a[i];
    --b[i];
  }

  par[0] = -1;
  for (int i = 0; i < n - 1; ++i) {
      par[b[i]] = a[i];
      g[a[i]].push_back(b[i]); 
  }

  for (int i = 0; i < n; ++i) {
    sz[i] = 1;
  }
  for (int i = n - 1; i >= 0; --i) {
    sz[a[i]] += sz[b[i]];
  }

  dfs(0);

  build(1, 0, n);

  for (int i = 0; i < n - 1; ++i) {
    cout << get_cost(a[i]) << "\n";

    // for (int u = 0; u < n; ++u) {
    //   cout << get_color(1, 0, n, tin[u]) << " ";
    // }
    // cout << endl;

    for (int u = b[i]; u != -1; u = par[top[u]]) {
      update(1, 0, n, tin[top[u]], tin[u] + 1, c[b[i]]);
    }
  }
}

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2668 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 2 ms 2664 KB Output is correct
4 Correct 2 ms 2672 KB Output is correct
5 Correct 3 ms 2772 KB Output is correct
6 Correct 2 ms 2772 KB Output is correct
7 Correct 3 ms 2772 KB Output is correct
8 Correct 2 ms 2808 KB Output is correct
9 Correct 2 ms 2772 KB Output is correct
10 Correct 2 ms 2772 KB Output is correct
11 Correct 2 ms 2804 KB Output is correct
12 Correct 3 ms 2772 KB Output is correct
13 Correct 2 ms 2804 KB Output is correct
14 Correct 2 ms 2772 KB Output is correct
15 Correct 3 ms 2772 KB Output is correct
16 Correct 3 ms 2772 KB Output is correct
17 Correct 3 ms 2772 KB Output is correct
18 Correct 3 ms 2772 KB Output is correct
19 Correct 2 ms 2772 KB Output is correct
20 Correct 2 ms 2772 KB Output is correct
21 Correct 2 ms 2772 KB Output is correct
22 Correct 2 ms 2772 KB Output is correct
23 Correct 2 ms 2772 KB Output is correct
24 Correct 2 ms 2772 KB Output is correct
25 Correct 2 ms 2800 KB Output is correct
26 Correct 2 ms 2772 KB Output is correct
27 Correct 2 ms 2772 KB Output is correct
28 Correct 2 ms 2800 KB Output is correct
29 Correct 2 ms 2808 KB Output is correct
30 Correct 3 ms 2772 KB Output is correct
31 Correct 3 ms 2772 KB Output is correct
32 Correct 2 ms 2772 KB Output is correct
33 Correct 2 ms 2772 KB Output is correct
34 Correct 2 ms 2772 KB Output is correct
35 Correct 2 ms 2772 KB Output is correct
36 Correct 2 ms 2772 KB Output is correct
37 Correct 2 ms 2772 KB Output is correct
38 Correct 3 ms 2800 KB Output is correct
39 Correct 2 ms 2800 KB Output is correct
40 Correct 3 ms 2804 KB Output is correct
41 Correct 3 ms 2772 KB Output is correct
42 Correct 3 ms 2800 KB Output is correct
43 Correct 2 ms 2772 KB Output is correct
44 Correct 2 ms 2800 KB Output is correct

Subtask #2
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2668 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 2 ms 2664 KB Output is correct
4 Correct 2 ms 2672 KB Output is correct
5 Correct 3 ms 2772 KB Output is correct
6 Correct 2 ms 2772 KB Output is correct
7 Correct 3 ms 2772 KB Output is correct
8 Correct 2 ms 2808 KB Output is correct
9 Correct 2 ms 2772 KB Output is correct
10 Correct 2 ms 2772 KB Output is correct
11 Correct 2 ms 2804 KB Output is correct
12 Correct 3 ms 2772 KB Output is correct
13 Correct 2 ms 2804 KB Output is correct
14 Correct 2 ms 2772 KB Output is correct
15 Correct 3 ms 2772 KB Output is correct
16 Correct 3 ms 2772 KB Output is correct
17 Correct 3 ms 2772 KB Output is correct
18 Correct 3 ms 2772 KB Output is correct
19 Correct 2 ms 2772 KB Output is correct
20 Correct 2 ms 2772 KB Output is correct
21 Correct 2 ms 2772 KB Output is correct
22 Correct 2 ms 2772 KB Output is correct
23 Correct 2 ms 2772 KB Output is correct
24 Correct 2 ms 2772 KB Output is correct
25 Correct 2 ms 2800 KB Output is correct
26 Correct 2 ms 2772 KB Output is correct
27 Correct 2 ms 2772 KB Output is correct
28 Correct 2 ms 2800 KB Output is correct
29 Correct 2 ms 2808 KB Output is correct
30 Correct 3 ms 2772 KB Output is correct
31 Correct 3 ms 2772 KB Output is correct
32 Correct 2 ms 2772 KB Output is correct
33 Correct 2 ms 2772 KB Output is correct
34 Correct 2 ms 2772 KB Output is correct
35 Correct 2 ms 2772 KB Output is correct
36 Correct 2 ms 2772 KB Output is correct
37 Correct 2 ms 2772 KB Output is correct
38 Correct 3 ms 2800 KB Output is correct
39 Correct 2 ms 2800 KB Output is correct
40 Correct 3 ms 2804 KB Output is correct
41 Correct 3 ms 2772 KB Output is correct
42 Correct 3 ms 2800 KB Output is correct
43 Correct 2 ms 2772 KB Output is correct
44 Correct 2 ms 2800 KB Output is correct
45 Correct 4 ms 2772 KB Output is correct
46 Correct 14 ms 3160 KB Output is correct
47 Correct 15 ms 3156 KB Output is correct
48 Correct 14 ms 3128 KB Output is correct
49 Correct 8 ms 3540 KB Output is correct
50 Correct 8 ms 3412 KB Output is correct
51 Correct 7 ms 3412 KB Output is correct
52 Correct 8 ms 3284 KB Output is correct
53 Correct 8 ms 3284 KB Output is correct
54 Correct 9 ms 3308 KB Output is correct
55 Correct 8 ms 3192 KB Output is correct
56 Correct 8 ms 3284 KB Output is correct
57 Correct 19 ms 3128 KB Output is correct
58 Correct 20 ms 3160 KB Output is correct
59 Correct 20 ms 3156 KB Output is correct
60 Correct 20 ms 3132 KB Output is correct
61 Correct 9 ms 3284 KB Output is correct
62 Correct 9 ms 3284 KB Output is correct
63 Correct 9 ms 3284 KB Output is correct
64 Correct 12 ms 3064 KB Output is correct
65 Correct 12 ms 3132 KB Output is correct
66 Correct 15 ms 3144 KB Output is correct
67 Correct 13 ms 3028 KB Output is correct
68 Correct 7 ms 3412 KB Output is correct
69 Correct 9 ms 3284 KB Output is correct
70 Correct 7 ms 3192 KB Output is correct
71 Correct 8 ms 3156 KB Output is correct
72 Correct 19 ms 3184 KB Output is correct
73 Correct 21 ms 3064 KB Output is correct
74 Correct 7 ms 3180 KB Output is correct
75 Correct 9 ms 3120 KB Output is correct
76 Correct 9 ms 3160 KB Output is correct
77 Correct 12 ms 3172 KB Output is correct
78 Correct 8 ms 3184 KB Output is correct
79 Correct 8 ms 3180 KB Output is correct
80 Correct 9 ms 3156 KB Output is correct
81 Correct 10 ms 3204 KB Output is correct
82 Correct 10 ms 3156 KB Output is correct
83 Correct 10 ms 3176 KB Output is correct
84 Correct 8 ms 3192 KB Output is correct
85 Correct 9 ms 3156 KB Output is correct
86 Correct 9 ms 3160 KB Output is correct

Subtask #3
84.0 / 84.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2668 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 2 ms 2664 KB Output is correct
4 Correct 2 ms 2672 KB Output is correct
5 Correct 3 ms 2772 KB Output is correct
6 Correct 2 ms 2772 KB Output is correct
7 Correct 3 ms 2772 KB Output is correct
8 Correct 2 ms 2808 KB Output is correct
9 Correct 2 ms 2772 KB Output is correct
10 Correct 2 ms 2772 KB Output is correct
11 Correct 2 ms 2804 KB Output is correct
12 Correct 3 ms 2772 KB Output is correct
13 Correct 2 ms 2804 KB Output is correct
14 Correct 2 ms 2772 KB Output is correct
15 Correct 3 ms 2772 KB Output is correct
16 Correct 3 ms 2772 KB Output is correct
17 Correct 3 ms 2772 KB Output is correct
18 Correct 3 ms 2772 KB Output is correct
19 Correct 2 ms 2772 KB Output is correct
20 Correct 2 ms 2772 KB Output is correct
21 Correct 2 ms 2772 KB Output is correct
22 Correct 2 ms 2772 KB Output is correct
23 Correct 2 ms 2772 KB Output is correct
24 Correct 2 ms 2772 KB Output is correct
25 Correct 2 ms 2800 KB Output is correct
26 Correct 2 ms 2772 KB Output is correct
27 Correct 2 ms 2772 KB Output is correct
28 Correct 2 ms 2800 KB Output is correct
29 Correct 2 ms 2808 KB Output is correct
30 Correct 3 ms 2772 KB Output is correct
31 Correct 3 ms 2772 KB Output is correct
32 Correct 2 ms 2772 KB Output is correct
33 Correct 2 ms 2772 KB Output is correct
34 Correct 2 ms 2772 KB Output is correct
35 Correct 2 ms 2772 KB Output is correct
36 Correct 2 ms 2772 KB Output is correct
37 Correct 2 ms 2772 KB Output is correct
38 Correct 3 ms 2800 KB Output is correct
39 Correct 2 ms 2800 KB Output is correct
40 Correct 3 ms 2804 KB Output is correct
41 Correct 3 ms 2772 KB Output is correct
42 Correct 3 ms 2800 KB Output is correct
43 Correct 2 ms 2772 KB Output is correct
44 Correct 2 ms 2800 KB Output is correct
45 Correct 4 ms 2772 KB Output is correct
46 Correct 14 ms 3160 KB Output is correct
47 Correct 15 ms 3156 KB Output is correct
48 Correct 14 ms 3128 KB Output is correct
49 Correct 8 ms 3540 KB Output is correct
50 Correct 8 ms 3412 KB Output is correct
51 Correct 7 ms 3412 KB Output is correct
52 Correct 8 ms 3284 KB Output is correct
53 Correct 8 ms 3284 KB Output is correct
54 Correct 9 ms 3308 KB Output is correct
55 Correct 8 ms 3192 KB Output is correct
56 Correct 8 ms 3284 KB Output is correct
57 Correct 19 ms 3128 KB Output is correct
58 Correct 20 ms 3160 KB Output is correct
59 Correct 20 ms 3156 KB Output is correct
60 Correct 20 ms 3132 KB Output is correct
61 Correct 9 ms 3284 KB Output is correct
62 Correct 9 ms 3284 KB Output is correct
63 Correct 9 ms 3284 KB Output is correct
64 Correct 12 ms 3064 KB Output is correct
65 Correct 12 ms 3132 KB Output is correct
66 Correct 15 ms 3144 KB Output is correct
67 Correct 13 ms 3028 KB Output is correct
68 Correct 7 ms 3412 KB Output is correct
69 Correct 9 ms 3284 KB Output is correct
70 Correct 7 ms 3192 KB Output is correct
71 Correct 8 ms 3156 KB Output is correct
72 Correct 19 ms 3184 KB Output is correct
73 Correct 21 ms 3064 KB Output is correct
74 Correct 7 ms 3180 KB Output is correct
75 Correct 9 ms 3120 KB Output is correct
76 Correct 9 ms 3160 KB Output is correct
77 Correct 12 ms 3172 KB Output is correct
78 Correct 8 ms 3184 KB Output is correct
79 Correct 8 ms 3180 KB Output is correct
80 Correct 9 ms 3156 KB Output is correct
81 Correct 10 ms 3204 KB Output is correct
82 Correct 10 ms 3156 KB Output is correct
83 Correct 10 ms 3176 KB Output is correct
84 Correct 8 ms 3192 KB Output is correct
85 Correct 9 ms 3156 KB Output is correct
86 Correct 9 ms 3160 KB Output is correct
87 Correct 49 ms 3952 KB Output is correct
88 Correct 126 ms 6104 KB Output is correct
89 Correct 501 ms 14236 KB Output is correct
90 Correct 498 ms 14184 KB Output is correct
91 Correct 512 ms 14196 KB Output is correct
92 Correct 180 ms 21868 KB Output is correct
93 Correct 178 ms 21880 KB Output is correct
94 Correct 179 ms 21776 KB Output is correct
95 Correct 183 ms 17440 KB Output is correct
96 Correct 203 ms 17728 KB Output is correct
97 Correct 197 ms 17708 KB Output is correct
98 Correct 199 ms 17764 KB Output is correct
99 Correct 200 ms 17316 KB Output is correct
100 Correct 729 ms 14388 KB Output is correct
101 Correct 779 ms 14684 KB Output is correct
102 Correct 813 ms 14672 KB Output is correct
103 Correct 799 ms 14700 KB Output is correct
104 Correct 227 ms 17264 KB Output is correct
105 Correct 221 ms 17224 KB Output is correct
106 Correct 224 ms 17256 KB Output is correct
107 Correct 427 ms 13144 KB Output is correct
108 Correct 486 ms 13500 KB Output is correct
109 Correct 511 ms 13724 KB Output is correct
110 Correct 159 ms 21224 KB Output is correct
111 Correct 182 ms 17472 KB Output is correct
112 Correct 185 ms 17224 KB Output is correct
113 Correct 178 ms 16668 KB Output is correct
114 Correct 736 ms 14260 KB Output is correct
115 Correct 777 ms 14024 KB Output is correct
116 Correct 206 ms 16624 KB Output is correct
117 Correct 214 ms 15452 KB Output is correct
118 Correct 240 ms 14880 KB Output is correct
119 Correct 239 ms 14584 KB Output is correct
120 Correct 206 ms 14928 KB Output is correct
121 Correct 219 ms 14576 KB Output is correct
122 Correct 217 ms 14248 KB Output is correct
123 Correct 241 ms 15428 KB Output is correct
124 Correct 255 ms 14940 KB Output is correct
125 Correct 265 ms 14668 KB Output is correct
126 Correct 236 ms 15080 KB Output is correct
127 Correct 244 ms 14564 KB Output is correct
128 Correct 247 ms 14400 KB Output is correct