oj.uz

답안 #381942

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
381942 2021-03-26T07:23:13 Z VEGAnn Janjetina (COCI21_janjetina) C++14
35 / 110
 1004 ms 21608 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define sz(x) ((int)x.size())
#define PB push_back
#define i2 array<int,2>
#define i3 array<int,3>
#define all(x) x.begin(),x.end()
using namespace std;
using namespace __gnu_pbds;
template <class T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long ll;
const int MX = int(1e7) + 10;
const int oo = 2e9;
const int N = 100100;
vector<i2> g[N], vc;
ordered_set<i2> st;
int n, k, siz[N], tt = 0;
bool mrk_cd[N];
ll ans;

void build_sz(int v, int p){
    siz[v] = 1;

    for (i2 U : g[v]){
        int u = U[0];

        if (u == p || mrk_cd[u]) continue;

        build_sz(u, v);

        siz[v] += siz[u];
    }
}

int search(int v, int p, int SZ){
    for (i2 U : g[v]){
        int u = U[0];

        if (u == p || mrk_cd[u]) continue;

        if (siz[u] > SZ / 2)
            return search(u, v, SZ);
    }

    return v;
}


void add(int v, int p, int mx, int len){
    vc.PB({mx, len});

    for (i2 u : g[v]){
        if (u[0] == p || mrk_cd[u[0]]) continue;

        add(u[0], v, max(mx, u[1]), len + 1);
    }
}

void build_cd(int v, int p){
    build_sz(v, -1);

    v = search(v, -1, siz[v]);

    mrk_cd[v] = 1;

    vc.clear();

    vc.PB({0, 0});

    for (i2 U : g[v]){
        int u = U[0];

        if (u == p || mrk_cd[u]) continue;

        add(u, v, U[1], 1);
    }

    sort(all(vc));
    st.clear();

    for (i2 cr : vc){
        int bd = cr[0] - k - cr[1];

        ans += st.order_of_key({bd, oo});

        st.insert({cr[1], ++tt});
    }

    for (i2 U : g[v]){
        int u = U[0];

        if (u == p || mrk_cd[u]) continue;

        vc.clear();

        add(u, v, U[1], 1);

        st.clear();

        for (i2 cr : vc){
            int bd = cr[0] - k - cr[1];

            ans -= st.order_of_key({bd, oo});

            st.insert({cr[1], ++tt});
        }
    }

    for (i2 U : g[v]){
        int u = U[0];

        if (u == p || mrk_cd[u]) continue;

        build_cd(u, v);
    }
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);

#ifdef _LOCAL
    freopen("in.txt","r",stdin);
#endif // _LOCAL

    cin >> n >> k;

    for (int i = 1; i < n; i++){
        int x, y, w; cin >> x >> y >> w;

        x--; y--;

        g[x].PB({y, w});
        g[y].PB({x, w});
    }

    build_cd(0, -1);

    cout << ans * 2;

    return 0;
}

Subtask #1
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2668 KB Output is correct
2 Correct 2 ms 2668 KB Output is correct
3 Correct 3 ms 2668 KB Output is correct
4 Correct 8 ms 2924 KB Output is correct
5 Correct 6 ms 2924 KB Output is correct
6 Correct 6 ms 2924 KB Output is correct
7 Correct 6 ms 2924 KB Output is correct
8 Correct 6 ms 2924 KB Output is correct
9 Correct 4 ms 2796 KB Output is correct
10 Correct 4 ms 2796 KB Output is correct
11 Incorrect 4 ms 2796 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #2
35.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2668 KB Output is correct
2 Correct 2 ms 2668 KB Output is correct
3 Correct 3 ms 2668 KB Output is correct
4 Correct 6 ms 2924 KB Output is correct
5 Correct 52 ms 4596 KB Output is correct
6 Correct 383 ms 11880 KB Output is correct
7 Correct 875 ms 21344 KB Output is correct
8 Correct 961 ms 21472 KB Output is correct
9 Correct 846 ms 21216 KB Output is correct
10 Correct 979 ms 21344 KB Output is correct
11 Correct 866 ms 21472 KB Output is correct
12 Correct 1004 ms 21216 KB Output is correct
13 Correct 838 ms 21472 KB Output is correct
14 Correct 964 ms 21520 KB Output is correct
15 Correct 971 ms 21216 KB Output is correct
16 Correct 912 ms 21608 KB Output is correct
17 Correct 875 ms 21216 KB Output is correct
18 Correct 883 ms 21452 KB Output is correct

Subtask #3
0 / 60.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2668 KB Output is correct
2 Correct 2 ms 2668 KB Output is correct
3 Correct 3 ms 2668 KB Output is correct
4 Correct 8 ms 2924 KB Output is correct
5 Correct 6 ms 2924 KB Output is correct
6 Correct 6 ms 2924 KB Output is correct
7 Correct 6 ms 2924 KB Output is correct
8 Correct 6 ms 2924 KB Output is correct
9 Correct 4 ms 2796 KB Output is correct
10 Correct 4 ms 2796 KB Output is correct
11 Incorrect 4 ms 2796 KB Output isn't correct
12 Halted 0 ms 0 KB -