oj.uz

Submission #444199

# Submission time Handle Problem Language Result Execution time Memory
444199 2021-07-13T10:35:48 Z ivan_tudor Election Campaign (JOI15_election_campaign) C++14
100 / 100
 171 ms 32472 KB 
#include<bits/stdc++.h>
using namespace std;
struct AIB{
  vector<int> aib;
  AIB(int n): aib(n + 1, 0){}
  void update(int poz, int val){
    for(int i = poz; i < aib.size(); i+= i &(-i))
      aib[i] += val;
  }
  int query(int poz){
    int ans = 0;
    for(int i = poz; i > 0; i-= i&(-i))
      ans += aib[i];
    return ans;
  }
  int getonint(int l, int r){
    if(l > r)
      return 0;
    return query(r) - query(l - 1);
  }
};
struct pathlca{
  int x, y;
  int c;
};
const int N = 100005;
const int LOG_N = 17;
vector<int> gr[N];
vector<pathlca> path[N];
int dp[N];
int dpson[N];
AIB sdp(2*N);
AIB sdpson(2*N);
int first[N], last[N];
int par[LOG_N][N];
int h[N];
void dfs_prec(int nod, int dad, int &cnt){
  h[nod] = h[dad] + 1;
  par[0][nod] = dad;
  first[nod] = ++cnt;
  for(auto x:gr[nod]){
    if(x != dad)
      dfs_prec(x, nod, cnt);
  }
  last[nod] = ++cnt;
}
void prec_lca(int n){
  int aux = 0;
  dfs_prec(1, 0, aux);
  for(int log = 1; log < LOG_N; log++){
    for(int i = 1; i <= n; i++){
      par[log][i] = par[log - 1][par[log - 1][i]];
    }
  }
}
bool is_parent(int x, int y){
  if(first[x] <= first[y] && last[y] <= last[x])
    return true;
  return false;
}
int get_lca(int x, int y){
  if(h[x] > h[y])
    swap(x, y);
  if(is_parent(x, y))
    return x;
  for(int pas = LOG_N - 1; pas >= 0; pas--){
    int old_dad = par[pas][x];
    if(old_dad !=0 && is_parent(old_dad, y) == false)
      x = old_dad;
  }
  return par[0][x];
}
int getsumpath(int x, int y, int p, AIB &sums){
  int sum = sums.getonint(first[p], first[x]) + sums.getonint(first[p] + 1, first[y]);
  return sum;
}
void addtonode(int nod, int val, AIB &sums){
  if(nod == 0)
    return;
  sums.update(first[nod], val);
  sums.update(last[nod], -val);
}
void dfs(int nod, int dad){
  int dpnod = 0;
  for(auto x:gr[nod])
    if(x!=dad){
      dfs(x, nod);
    }
  dpnod = dpson[nod];
  for(auto tri:path[nod]){
    int x = tri.x, y = tri.y, c = tri.c;
    int sum = getsumpath(x, y, nod, sdp);
    int sumson = getsumpath(x, y, nod, sdpson);
    dpnod = max(dpnod, sumson - sum + c);
  }
  dp[nod] = dpnod;
  addtonode(nod, dpnod, sdp);
  dpson[par[0][nod]] += dpnod;
  addtonode(par[0][nod], dpnod, sdpson);
}

int main()
{
  //freopen(".in","r",stdin);
  ios::sync_with_stdio(false);
  cin.tie(0),cout.tie(0);
  int n;
  cin>>n;
  for(int i = 1; i < n; i++){
    int x, y;
    cin>>x>>y;
    gr[x].push_back(y);
    gr[y].push_back(x);
  }
  int m;
  prec_lca(n);
  cin>>m;
  for(int i = 1; i <=m; i++){
    int x, y, c;
    cin>>x>>y>>c;
    int lca = get_lca(x, y);
    path[lca].push_back({x, y, c});
  }
  dfs(1, 0);
  cout<<dp[1];
  return 0;
}

Compilation message

election_campaign.cpp: In member function 'void AIB::update(int, int)':
election_campaign.cpp:7:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 |     for(int i = poz; i < aib.size(); i+= i &(-i))
      |                      ~~^~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 6604 KB Output is correct
2 Correct 4 ms 6604 KB Output is correct
3 Correct 4 ms 6604 KB Output is correct
4 Correct 4 ms 6732 KB Output is correct
5 Correct 94 ms 19556 KB Output is correct
6 Correct 55 ms 28828 KB Output is correct
7 Correct 78 ms 25564 KB Output is correct
8 Correct 72 ms 19528 KB Output is correct
9 Correct 80 ms 23712 KB Output is correct
10 Correct 76 ms 19576 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 6604 KB Output is correct
2 Correct 4 ms 6604 KB Output is correct
3 Correct 4 ms 6860 KB Output is correct
4 Correct 105 ms 29712 KB Output is correct
5 Correct 102 ms 29712 KB Output is correct
6 Correct 104 ms 29772 KB Output is correct
7 Correct 105 ms 29692 KB Output is correct
8 Correct 103 ms 29668 KB Output is correct
9 Correct 111 ms 29636 KB Output is correct
10 Correct 106 ms 29716 KB Output is correct

Subtask #3
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 6604 KB Output is correct
2 Correct 4 ms 6604 KB Output is correct
3 Correct 4 ms 6860 KB Output is correct
4 Correct 105 ms 29712 KB Output is correct
5 Correct 102 ms 29712 KB Output is correct
6 Correct 104 ms 29772 KB Output is correct
7 Correct 105 ms 29692 KB Output is correct
8 Correct 103 ms 29668 KB Output is correct
9 Correct 111 ms 29636 KB Output is correct
10 Correct 106 ms 29716 KB Output is correct
11 Correct 13 ms 7400 KB Output is correct
12 Correct 109 ms 29636 KB Output is correct
13 Correct 109 ms 29672 KB Output is correct
14 Correct 104 ms 29664 KB Output is correct
15 Correct 116 ms 29720 KB Output is correct
16 Correct 110 ms 29636 KB Output is correct
17 Correct 108 ms 29624 KB Output is correct
18 Correct 107 ms 29652 KB Output is correct
19 Correct 108 ms 29684 KB Output is correct
20 Correct 105 ms 29628 KB Output is correct

Subtask #4
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 156 ms 19836 KB Output is correct
2 Correct 104 ms 32148 KB Output is correct
3 Correct 171 ms 28488 KB Output is correct
4 Correct 126 ms 22524 KB Output is correct
5 Correct 146 ms 27856 KB Output is correct
6 Correct 125 ms 22392 KB Output is correct
7 Correct 167 ms 27660 KB Output is correct
8 Correct 155 ms 22588 KB Output is correct
9 Correct 105 ms 32068 KB Output is correct
10 Correct 163 ms 26424 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 6604 KB Output is correct
2 Correct 4 ms 6604 KB Output is correct
3 Correct 4 ms 6604 KB Output is correct
4 Correct 4 ms 6732 KB Output is correct
5 Correct 94 ms 19556 KB Output is correct
6 Correct 55 ms 28828 KB Output is correct
7 Correct 78 ms 25564 KB Output is correct
8 Correct 72 ms 19528 KB Output is correct
9 Correct 80 ms 23712 KB Output is correct
10 Correct 76 ms 19576 KB Output is correct
11 Correct 5 ms 6732 KB Output is correct
12 Correct 6 ms 6860 KB Output is correct
13 Correct 5 ms 6860 KB Output is correct
14 Correct 4 ms 6860 KB Output is correct
15 Correct 5 ms 6732 KB Output is correct
16 Correct 5 ms 6872 KB Output is correct
17 Correct 5 ms 6860 KB Output is correct
18 Correct 5 ms 6860 KB Output is correct
19 Correct 5 ms 6860 KB Output is correct
20 Correct 5 ms 6860 KB Output is correct

Subtask #6
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 6604 KB Output is correct
2 Correct 4 ms 6604 KB Output is correct
3 Correct 4 ms 6604 KB Output is correct
4 Correct 4 ms 6732 KB Output is correct
5 Correct 94 ms 19556 KB Output is correct
6 Correct 55 ms 28828 KB Output is correct
7 Correct 78 ms 25564 KB Output is correct
8 Correct 72 ms 19528 KB Output is correct
9 Correct 80 ms 23712 KB Output is correct
10 Correct 76 ms 19576 KB Output is correct
11 Correct 4 ms 6604 KB Output is correct
12 Correct 4 ms 6604 KB Output is correct
13 Correct 4 ms 6860 KB Output is correct
14 Correct 105 ms 29712 KB Output is correct
15 Correct 102 ms 29712 KB Output is correct
16 Correct 104 ms 29772 KB Output is correct
17 Correct 105 ms 29692 KB Output is correct
18 Correct 103 ms 29668 KB Output is correct
19 Correct 111 ms 29636 KB Output is correct
20 Correct 106 ms 29716 KB Output is correct
21 Correct 13 ms 7400 KB Output is correct
22 Correct 109 ms 29636 KB Output is correct
23 Correct 109 ms 29672 KB Output is correct
24 Correct 104 ms 29664 KB Output is correct
25 Correct 116 ms 29720 KB Output is correct
26 Correct 110 ms 29636 KB Output is correct
27 Correct 108 ms 29624 KB Output is correct
28 Correct 107 ms 29652 KB Output is correct
29 Correct 108 ms 29684 KB Output is correct
30 Correct 105 ms 29628 KB Output is correct
31 Correct 156 ms 19836 KB Output is correct
32 Correct 104 ms 32148 KB Output is correct
33 Correct 171 ms 28488 KB Output is correct
34 Correct 126 ms 22524 KB Output is correct
35 Correct 146 ms 27856 KB Output is correct
36 Correct 125 ms 22392 KB Output is correct
37 Correct 167 ms 27660 KB Output is correct
38 Correct 155 ms 22588 KB Output is correct
39 Correct 105 ms 32068 KB Output is correct
40 Correct 163 ms 26424 KB Output is correct
41 Correct 5 ms 6732 KB Output is correct
42 Correct 6 ms 6860 KB Output is correct
43 Correct 5 ms 6860 KB Output is correct
44 Correct 4 ms 6860 KB Output is correct
45 Correct 5 ms 6732 KB Output is correct
46 Correct 5 ms 6872 KB Output is correct
47 Correct 5 ms 6860 KB Output is correct
48 Correct 5 ms 6860 KB Output is correct
49 Correct 5 ms 6860 KB Output is correct
50 Correct 5 ms 6860 KB Output is correct
51 Correct 150 ms 23080 KB Output is correct
52 Correct 107 ms 32408 KB Output is correct
53 Correct 166 ms 26820 KB Output is correct
54 Correct 123 ms 22796 KB Output is correct
55 Correct 151 ms 22652 KB Output is correct
56 Correct 111 ms 32464 KB Output is correct
57 Correct 156 ms 27604 KB Output is correct
58 Correct 129 ms 22652 KB Output is correct
59 Correct 160 ms 22964 KB Output is correct
60 Correct 109 ms 32472 KB Output is correct
61 Correct 150 ms 27716 KB Output is correct
62 Correct 126 ms 22436 KB Output is correct
63 Correct 155 ms 22440 KB Output is correct
64 Correct 114 ms 32444 KB Output is correct
65 Correct 164 ms 27580 KB Output is correct
66 Correct 118 ms 22656 KB Output is correct
67 Correct 151 ms 22528 KB Output is correct
68 Correct 110 ms 32400 KB Output is correct
69 Correct 154 ms 26308 KB Output is correct
70 Correct 128 ms 22876 KB Output is correct