oj.uz

Submission #474673

# Submission time Handle Problem Language Result Execution time Memory
474673 2021-09-19T10:12:06 Z mychecksedad Janjetina (COCI21_janjetina) C++17
15 / 110
 20 ms 3276 KB 
#include<bits/stdc++.h>
using namespace std;
typedef long long int ll;
#define pb push_back
#define all(x) x.begin(), x.end()
const int N = 1e5+10;



int n, k, s[N], parent[N], rmq[N][22], r[N];
pair<int, int> arr[N];
ll ans = 0;
vector<pair<int, int>> g[N];
void dfs(int v, int p, int mx, int d){
    for(auto u: g[v]){
        if(u.first != p){
            if(max(mx, u.second) - d - 1 >= k) ++ans;
            dfs(u.first, v, max(mx, u.second), d+1);
        }
    }
}
int find_set(int v){
    if(parent[v] == v) return v;
    return parent[v] = find_set(parent[v]);
}
void union_set(int a, int b){
    a = find_set(a);
    b = find_set(b);
    if(a != b){
        if(s[a] < s[b]) swap(a, b);
        parent[b] = a;
        s[a] += s[b]; 
    }
}
void precalc(){
    for(int i = 1; i < n; i++) rmq[i][0] = r[i];
    for(int j = 1; j < 22; j++){
        for(int i = 1; i <= n; i++){
            rmq[i][j] = max(rmq[i][j - 1], rmq[i + (1<<j)][j - 1]);
        }
    }
}
int mx(int x, int y){
    int k = __lg(y - x + 1);
    return max(rmq[x][k], rmq[y - (1<<k) + 1][k]);
}
int main(){
    cin.tie(0); ios::sync_with_stdio(0);
    cin >> n >> k;
    for(int i = 0; i < n-1; i++){
        int a, b, w;
        cin >> a >> b >> w;
        arr[i + 1] = {w, i};
        r[i + 1] = w; 
        g[a].pb({b, w});
        g[b].pb({a, w});
    }
    // precalc();
    if(n <= 1000){
        for(int i = 1; i <= n; i++) dfs(i, 0, 0, 0);

    }else{
        sort(arr + 1, arr + n);
        for(int i = 1; i <= n; i++){
            s[i] = 1;
            parent[i] = i;
        }
        for(int i = 1; i < n; i++){
            int pos = arr[i].second;
            int x = s[find_set(pos)];
            int y = s[find_set(pos+1)];
            int t = mx(pos - x + 1, pos + 1 + y - 2) - k;
            if(x <= t){
                ans += ll(x) * ll(t - x + 1);
                // ans += 
            }
            else{
                ans += ll(min(t, y)) * ll((min(t, y) + 1) / 2);
            }
            union_set(i, i+1);
        }
    }
    cout << ans;

    return 0;
}

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2636 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Correct 2 ms 2636 KB Output is correct
4 Correct 12 ms 2804 KB Output is correct
5 Correct 10 ms 2764 KB Output is correct
6 Correct 20 ms 2680 KB Output is correct
7 Correct 14 ms 2800 KB Output is correct
8 Correct 11 ms 2812 KB Output is correct
9 Correct 12 ms 2636 KB Output is correct
10 Correct 12 ms 2740 KB Output is correct
11 Correct 12 ms 2636 KB Output is correct
12 Correct 15 ms 2736 KB Output is correct
13 Correct 14 ms 2736 KB Output is correct
14 Correct 14 ms 2732 KB Output is correct
15 Correct 18 ms 2732 KB Output is correct
16 Correct 16 ms 2736 KB Output is correct
17 Correct 15 ms 2636 KB Output is correct
18 Correct 14 ms 2736 KB Output is correct
19 Correct 15 ms 2680 KB Output is correct
20 Correct 15 ms 2636 KB Output is correct
21 Correct 17 ms 2636 KB Output is correct
22 Correct 17 ms 2736 KB Output is correct

Subtask #2
0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2636 KB Output is correct
2 Correct 2 ms 2672 KB Output is correct
3 Correct 2 ms 2668 KB Output is correct
4 Correct 10 ms 2764 KB Output is correct
5 Incorrect 7 ms 3276 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #3
0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2636 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Correct 2 ms 2636 KB Output is correct
4 Correct 12 ms 2804 KB Output is correct
5 Correct 10 ms 2764 KB Output is correct
6 Correct 20 ms 2680 KB Output is correct
7 Correct 14 ms 2800 KB Output is correct
8 Correct 11 ms 2812 KB Output is correct
9 Correct 12 ms 2636 KB Output is correct
10 Correct 12 ms 2740 KB Output is correct
11 Correct 12 ms 2636 KB Output is correct
12 Correct 15 ms 2736 KB Output is correct
13 Correct 14 ms 2736 KB Output is correct
14 Correct 14 ms 2732 KB Output is correct
15 Correct 18 ms 2732 KB Output is correct
16 Correct 16 ms 2736 KB Output is correct
17 Correct 15 ms 2636 KB Output is correct
18 Correct 14 ms 2736 KB Output is correct
19 Correct 15 ms 2680 KB Output is correct
20 Correct 15 ms 2636 KB Output is correct
21 Correct 17 ms 2636 KB Output is correct
22 Correct 17 ms 2736 KB Output is correct
23 Correct 2 ms 2636 KB Output is correct
24 Correct 2 ms 2672 KB Output is correct
25 Correct 2 ms 2668 KB Output is correct
26 Correct 10 ms 2764 KB Output is correct
27 Incorrect 7 ms 3276 KB Output isn't correct
28 Halted 0 ms 0 KB -