Submission #1120100

#	Time	Username	Problem	Language	Result	Execution time	Memory
1120100		JanPham	Ball Machine (BOI13_ballmachine)	C++17	0 / 100	42 ms	29196 KiB

ballmachine

#include <bits/stdc++.h>

using namespace std;

#define pb push_back
#define fi first
#define se second
#define TranLeThanhTam "TranLeThanhTam"
#define all(v) v.begin(),v.end()
#define reset(a,i) memset(a,i,sizeof(a))
#define FOR(i,a,b) for (int i = (a), _b = (b); i <= _b; ++i)
#define FORD(i,a,b) for (int i = (a), _b = (b); i >= _b; --i)
#define compact(v) sort(all(v)), v.erase(unique(all(v)), end(v))
#define sz(v) (int) v.size()
#define MASK(i) (1 << (i))

typedef long long ll;
typedef long double lb;
typedef pair<ll,ll> pll;
typedef pair<int,int> pii;

const int Thanh_Tam = 1e5 + 17;
const int inf = 1e9 + 17;
const long long infll = 1e18 + 17;
const int MOD = 1e9 + 7;
const int Log = 18;
const int dx[4] = {-1, 0, 0, 1};
const int dy[4] = {0, -1, 1, 0};
const int max_block_size = 270;
const ll P = 311;
const int maxA = 1e2 + 17;
const int addi = 1e9;
const char dir[4] = {'W', 'S', 'N', 'E'};
const int Mod[3] = {998244353, MOD, 759186269};

ll mul(ll a, ll b, ll mod);
ll binpow(ll a, ll b, ll mod)
{
    ll res = 1;
    while (b > 0)
    {
        if (b & 1) res = mul(res,a,mod);
        b >>= 1;
        a = mul(a,a,mod);
    }
    return res;
}
ll add(ll a, ll b, ll mod) { return (a + b) % mod;                 }
ll sub(ll a, ll b, ll mod) { return (a - b + mod) % mod;          }
ll mul(ll a, ll b, ll mod) { return ((a % mod) * (b % mod)) % mod; }
ll div(ll a, ll b, ll mod) { return mul(a, binpow(b, mod - 2, mod), mod); }

mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rand_range(ll l, ll r) { return uniform_int_distribution<ll>(l,r)(rng); }

struct Fenwick
{
    vector<int> cnt;

    Fenwick() {}

    Fenwick(int _n)
    {
        cnt.assign(_n + 1, 0);
        return;
    }

    void update(int id, int val)
    {
        for (; id < sz(cnt); id += id & (-id)) cnt[id] += val;
        return;
    }

    int query(int id)
    {
        int res = 0;
        for (; id > 0; id -= id & (-id)) res += cnt[id];
        return res;
    }
} tree;

int n, q, timer = 0;
vector<int> adj[Thanh_Tam];
int tin[Thanh_Tam], tout[Thanh_Tam], tour[Thanh_Tam];
int tin_spr[Thanh_Tam], tout_spr[Thanh_Tam], tour_spr[Thanh_Tam << 1];
int spr[Thanh_Tam << 1][Log + 1];

void dfs1(int u, int Par)
{
    tin[u] = ++timer;
    tour[timer] = u;

    for (int v : adj[u])
    {
        if (v == Par) continue;
        dfs1(v,u);
    }

    tout[u] = timer;
    return;
}

void dfs2(int u, int Par)
{
    tin_spr[u] = ++timer;
    tour_spr[timer] = u;

    for (int v : adj[u])
    {
        if (v == Par) continue;
        dfs2(v,u);
        tour_spr[++timer] = u;
    }

    tout_spr[u] = timer;
    return;
}

void prepare()
{
    timer = 0, dfs1(1, -1);
    timer = 0, dfs2(1, -1);
    tree = Fenwick(n);

    FOR(i,1,(n << 1) - 1) spr[i][0] = tour_spr[i];
    FOR(j,1,Log)
    {

    }

    return;
}

void ThanhTam()
{
    cin >> n >> q;
    FOR(v,1,n)
    {
        int u;
        cin >> u;
        if (v == 1) continue;
        adj[u].pb(v);
        adj[v].pb(u);
    }

    prepare();
    return;
}

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    if (fopen(TranLeThanhTam".inp","r"))
    {
        freopen(TranLeThanhTam".inp","r",stdin);
        freopen(TranLeThanhTam".out","w",stdout);
    }

    int t = 1;
    //cin >> t;
    while (t--)
        ThanhTam();

    return 0;
}

Compilation message (stderr)

ballmachine.cpp: In function 'int main()':
ballmachine.cpp:158:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  158 |         freopen(TranLeThanhTam".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ballmachine.cpp:159:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  159 |         freopen(TranLeThanhTam".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 25
• Subtask 2: 0 / 30
• Subtask 3: 0 / 40
• Subtask 4: 0 / 5