Submission #237505

#	Time	Username	Problem	Language	Result	Execution time	Memory
237505		kartel	Birokracija (COCI18_birokracija)	C++14	100 / 100	121 ms	23728 KiB

birokracija

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
#define in(x) freopen(x, "r", stdin)
#define out(x) freopen(x, "w", stdout)
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("-O3")
#define F first
#define S second
#define pb push_back
#define N +200500
#define MaxS N * N
#define M ll(1e9 + 7)
#define sz(x) (int)x.size()
//#define re return
#define oo ll(1e18)
#define el '\n'
#define pii pair <int, int>
using namespace std;
//using namespace __gnu_pbds;
//typedef tree <int, null_type, less_equal <int> , rb_tree_tag, tree_order_statistics_node_update> ordered_set;
typedef long long ll;
typedef long double ld;

ll d[N], siz[N], f[N], i, n, v;
vector <ll> g[N];

void dfs(ll v, ll pr)
{
    d[v] = d[pr] + 1;
    f[v] = 0;
    siz[v] = 1;

    for (auto u : g[v])
    {
        if (u == pr) continue;

        dfs(u, v);

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

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

int main()
{
    srand(time(0));
    ios_base::sync_with_stdio(0);
    iostream::sync_with_stdio(0);
    ios::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);

//    in("input.txt");
//    out("output.txt");

    cin >> n;
    for (i = 2; i <= n; i++)
    {
        cin >> v;
        g[v].pb(i);
    }

    for (i = 1; i <= n; i++) sort(g[i].begin(), g[i].end());

    d[0] = 0;
    dfs(1, 0);

    for (i = 1; i <= n; i++) cout << f[i] << " ";
}

//  x ^ 2 + y ^ 2 = 1
//  x * a_i + y * b_i
//  a_i = -b_i * tan(alpha)
//  a_i / -b_i = tan(alpha)
//  alpha = atan(a_i / (-b_i))

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10