제출 #1285088

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1285088		souvenir_vayne	Regions (IOI09_regions)	C++20	1 / 100	4014 ms	196608 KiB

regions

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <chrono>
#define pb push_back
#define INF 0x3f3f3f3f
#define LINF 0x3f3f3f3f3f3f3f3f
#define endl '\n'
#define ll long long
#define f first
#define fin cin
#define fout cout
#define s second
#define FAST cin.tie(0), cout.tie(0), ios::sync_with_stdio(0)
#define debug(x) cerr << "DEBUG " << x << endl
#define debug2(x, y) cerr << "DEBUG " << x << " " << y << endl
#define debug3(x, y, z) cerr << "DEBUG " << x << " " << y << " " << z << endl
#define debug4(x, y, z, o) cerr << "DEBUG " << x << " " << y << " " << z << " " << o << endl
#define all(x) x.begin(), x.end()
#define left esquerda
#define lb lower_bound
#define right direita
using namespace std;
void setIO(string s) {
    ios_base::sync_with_stdio(0); cin.tie(0);
    freopen((s+".in").c_str(),"r",stdin);
    freopen((s+".out").c_str(),"w",stdout);
}
typedef pair<ll, ll> pii;
typedef vector<vector<char>> mat;
typedef pair<int, string> pis;
const ll mod = 1e9 + 7, MAXN = 2e5 + 5;
typedef vector<int> vi;
typedef pair<int, pair<int, int>> piii;

const int N = 2e5;  // limit for array size
int t[2 * N];
int n;

void modify(int p, int value) {  // set value at position p
  for (t[p += n] = value; p > 1; p >>= 1) t[p>>1] = t[p] + t[p^1];
}

int query(int l, int r) {  // sum on interval [l, r)
  int res = 0;
  for (l += n, r += n; l < r; l >>= 1, r >>= 1) {
    if (l&1) res += t[l++];
    if (r&1) res += t[--r];
  }
  return res;
}

void solve() {
    int r, q;
    cin >> n >> r >> q;
    vector<vector<int>> rs(r + 5), g(n + 5);
    vector<int> rr(n + 5);

    int rc;
    cin >> rc;
    rr[1] = rc;
    rs[rc].push_back(1);

    for(int i = 2; i <= n; i++) {
        int p, cr;
        cin >> p >> cr;
        rr[i] = cr;
        g[p].push_back(i);
        rs[cr].push_back(i);
    }

    vector<int> s(n + 5), e(n + 5), v(n + 5), v2(n + 5);
    int time = 0;

    auto dfs = [&](int u, auto &dfs) -> void {
        s[u] = time;
        time++;

        for(int &i : g[u])
            dfs(i, dfs);
        e[u] = time - 1;
        return;
    };
    dfs(1, dfs);

    auto dfs2 = [&](int u, int r, auto &dfs2) -> void {
        v[u] += (rr[u] == r);
        v2[u] = (rr[u] == r); 
        for(int &i : g[u]) {
            v[i] = v[u];
            dfs2(i, r, dfs2);
            v2[u] += v2[i];
        }
        return;
    };

    unordered_map<long long, int> mapa;
    for(int i = 1; i <= r; i++) {

        int sz = rs[i].size();
        if(sz * sz >= n) {
        
            v[1] = 0;
            dfs2(1, i, dfs2);

            for(int j = 1; j <= r; j++) {
                int ans = 0, ans2 = 0;
                for(int &k : rs[j]) {
                    ans += v2[k];
                    ans2 += v[k];
                }

                mapa[((1ll * j)<<32LL) | i] = ans;
                mapa[((1ll * i)<<32LL) | j] = ans2;
            }

        }

    }

    while(q--) {
        int r1, r2;
        cin >> r1 >> r2;
        
        if(mapa.find(((1ll * r1)<<32LL) | r2) != mapa.end()) {
            cout << mapa[((1ll * r1)<<32LL) | r2] << endl << flush;
            continue;
        }

        for(int &j : rs[r2]) 
            modify(s[j], 1);
        
        int ans = 0;
        for(int &k : rs[r1]) 
            ans += query(s[k], e[k]);

        for(int &j : rs[r2])
            modify(s[j], 0);

        mapa[((1ll * r1)<<32LL) | r2] = ans;        
        cout << ans << '\n' << flush;

    }
}

int32_t main() {
    FAST;
    int ct = 1;
    // cin >> ct;
    while(ct--)
        solve();
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

regions.cpp: In function 'void setIO(std::string)':
regions.cpp:25:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |     freopen((s+".in").c_str(),"r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
regions.cpp:26:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |     freopen((s+".out").c_str(),"w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 1 / 15
• Subtask 2: 0 / 85