제출 #986424

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
986424		kh0i	Birokracija (COCI18_birokracija)	C++17	100 / 100	63 ms	26964 KiB

birokracija

#include "bits/stdc++.h"
using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...)
#endif

using ll = long long;
using pii = pair<int, int>;

#define F first
#define S second
#define sz(x) (int)((x).size())
#define all(x) (x).begin(), (x).end()

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll get_rand(ll l, ll r) {
    assert(l <= r);
    return uniform_int_distribution<ll> (l, r)(rng);
}

const int N = 2e5 + 3;

int n;
vector<int> g[N];
ll f[N], sz[N];

void dfs_sz(int u){
    sz[u] = 1;
    for(int v : g[u]){
        dfs_sz(v);
        sz[u] += sz[v];
    }
}

void dfs(int u){
    for(int v : g[u]){
        dfs(v);
        f[u] += f[v];
    }
    f[u] += sz[u];
}

void solve(){
    cin >> n;
    for(int i = 2; i <= n; ++i){
        int p;
        cin >> p;
        g[p].push_back(i);
    }

    dfs_sz(1);
    dfs(1);

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

int32_t main() {
    cin.tie(nullptr)->sync_with_stdio(0);
    #define task "troll"
    if(fopen(task".inp", "r")){
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    int test = 1;
//    cin >> test;
    for(int i = 1; i <= test; ++i){
//        cout << "Case #" << i << ": ";
        solve();
    }
    #ifdef LOCAL
        cerr << "\n[Time]: " << 1000.0 * clock() / CLOCKS_PER_SEC << " ms.\n";
    #endif
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

birokracija.cpp: In function 'int32_t main()':
birokracija.cpp:65:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
birokracija.cpp:66:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• 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