oj.uz

답안 #381912

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
381912 2021-03-26T06:45:04 Z kartel Janjetina (COCI21_janjetina) C++14
35 / 110
 363 ms 16348 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, vc;

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) {
    vc.pb({mx, 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);
    }
}

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;
        }

        vc.clear();

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

        for (auto x : vc) {
            upd(x.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 2 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 4 ms 2924 KB Output is correct
6 Correct 4 ms 2924 KB Output is correct
7 Correct 5 ms 2924 KB Output is correct
8 Correct 4 ms 2924 KB Output is correct
9 Correct 3 ms 2796 KB Output is correct
10 Correct 3 ms 2796 KB Output is correct
11 Incorrect 3 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 2796 KB Output is correct
3 Correct 2 ms 2796 KB Output is correct
4 Correct 6 ms 2924 KB Output is correct
5 Correct 25 ms 4204 KB Output is correct
6 Correct 171 ms 9448 KB Output is correct
7 Correct 297 ms 16092 KB Output is correct
8 Correct 356 ms 16220 KB Output is correct
9 Correct 306 ms 16220 KB Output is correct
10 Correct 359 ms 16092 KB Output is correct
11 Correct 295 ms 16092 KB Output is correct
12 Correct 355 ms 16092 KB Output is correct
13 Correct 308 ms 16092 KB Output is correct
14 Correct 360 ms 16348 KB Output is correct
15 Correct 363 ms 16092 KB Output is correct
16 Correct 350 ms 16068 KB Output is correct
17 Correct 357 ms 16092 KB Output is correct
18 Correct 350 ms 15884 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 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 5 ms 2924 KB Output is correct
8 Correct 4 ms 2924 KB Output is correct
9 Correct 3 ms 2796 KB Output is correct
10 Correct 3 ms 2796 KB Output is correct
11 Incorrect 3 ms 2796 KB Output isn't correct
12 Halted 0 ms 0 KB -