oj.uz

답안 #381905

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
381905 2021-03-26T06:42:22 Z kartel Janjetina (COCI21_janjetina) C++14
35 / 110
 375 ms 17632 KB 
#include <bits/stdc++.h>
#define in(x) freopen(x, "r", stdin)
#define out(x) freopen(x, "w", stdout)
//#include <time.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("-O3")
#define F first
#define S second
#define pb push_back
//#define M ll(1e9 + 7)
#define M ll(998244353)
#define sz(x) (int)x.size()
#define re return
#define oo ll(1e18)
#define el '\n'
#define pii pair <int, int>
#define all(x) (x).begin(), (x).end()
#define arr_all(x, n) (x + 1), (x + 1 + n)
#define vi vector<int>
#define eps (ld)1e-9
using namespace std;
typedef long long ll;
//using namespace __gnu_pbds;
//typedef tree <ll, null_type, less_equal <ll> , rb_tree_tag, tree_order_statistics_node_update> ordered_set;
typedef double ld;
typedef unsigned long long ull;
typedef short int si;

const int N = 1e5 + 500;

vector <pii> g[N], vec;

int siz[N], to[N], cntall, n, k, root, f[N];
ll ans;

void upd(int v, int val) {for (; v < N; v = (v | (v + 1))) f[v] += val;}
int get(int v) {int res = 0; for (; v >= 0; v = (v & (v + 1)) - 1) res += f[v]; return res;}

void calc_sizes(int v, int pr) {
    siz[v] = 1;

    for (auto u : g[v]) {
        if (to[u.F] || u.F == pr) {
            continue;
        }

        calc_sizes(u.F, v);
        siz[v] += siz[u.F];
    }
}

int fnd_cent(int v, int pr) {
    int cent = -1;

    for (auto u : g[v]) {
        if (to[u.F] || u.F == pr) {
            continue;
        }

        if (siz[u.F] > siz[root] / 2 && (cent == -1 || siz[cent] < siz[u.F])) {
            cent = u.F;
        }
    }

    if (cent == -1) {
        return v;
    }
    else {
        return fnd_cent(cent, v);
    }
}

void calc(int v, int pr, int mx) {
    if (mx > k) {
        ans += cntall + 1;
    }

    for (auto u : g[v]) {
        if (to[u.F] || u.F == pr) {
            continue;
        }

        calc(u.F, v, max(mx, u.S));
    }
}

void add(int v, int pr, int mx, int l) {
    vec.pb({mx, l});

    if (mx - l - k >= 0) {
        ans -= get(mx - l - k);
    }

    upd(l, 1);

    for (auto u : g[v]) {
        if (to[u.F] || u.F == pr) {
            continue;
        }

        add(u.F, v, max(mx, u.S), l + 1);
    }
    upd(l, -1);
}

void go(int v, int pr) {
    root = v;
    calc_sizes(v, pr);

    int cent = fnd_cent(v, pr);
    to[cent] = 1;

    vec.clear();

    cntall = 0;
    for (auto u : g[cent]) {
        if (to[u.F]) {
            continue;
        }

        add(u.F, cent, u.S, 1);
    }

    sort(all(vec));

    for (int i = 0; i < sz(vec); i++) {
        int w1 = vec[i].F;
        int l1 = vec[i].S;

        if (w1 - l1 >= k) {
            ans++;
        }

        if (w1 - l1 - k >= 0) {
            ans += get(w1 - l1 - k);
        }

        upd(l1, 1);
    }
    for (int i = 0; i < sz(vec); i++) {
        upd(vec[i].S, -1);
    }

    for (auto u : g[cent]) {
        if (to[u.F]) {
            continue;
        }

        go(u.F, v);
    }
}

int main()
{
//    mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());;
	ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
//	in("toys.in");
//	out("toys.out");
//    in("input.txt");
//    out("output.txt");
//    cerr.precision(9); cerr << fixed;

//    clock_t tStart = clock();

    cin >> n >> k;

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

        g[v].pb({u, w});
        g[u].pb({v, w});
    }

    go(1, -1);

    cout << ans * 2ll;
}


/*

7
4 6 7 2 3 1 5
*/

Subtask #1
0 / 15.0

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

Subtask #2
35.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 2668 KB Output is correct
2 Correct 2 ms 2796 KB Output is correct
3 Correct 3 ms 2796 KB Output is correct
4 Correct 4 ms 2924 KB Output is correct
5 Correct 24 ms 4076 KB Output is correct
6 Correct 155 ms 9196 KB Output is correct
7 Correct 294 ms 16864 KB Output is correct
8 Correct 341 ms 17376 KB Output is correct
9 Correct 293 ms 16992 KB Output is correct
10 Correct 351 ms 17376 KB Output is correct
11 Correct 289 ms 16864 KB Output is correct
12 Correct 345 ms 17632 KB Output is correct
13 Correct 287 ms 17016 KB Output is correct
14 Correct 343 ms 17376 KB Output is correct
15 Correct 375 ms 17376 KB Output is correct
16 Correct 340 ms 17632 KB Output is correct
17 Correct 351 ms 17272 KB Output is correct
18 Correct 343 ms 17376 KB Output is correct

Subtask #3
0 / 60.0

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