提出 #43364963

---

ソースコード 拡げる

/** @file
 * @ingroup


 */
#include <bits/stdc++.h>
using namespace std;
template <typename T> inline void O(const T &x) { cout << x << '\n'; }
template <typename T, typename... W> inline void O(const T &x, const W &...b) {
  cout << x << ' ';
  O(b...);
}
template <typename T> inline void rd(T &x) { cin >> x; }
template <typename T, typename... W> inline void rd(T &x, W &...b) {
  cin >> x;
  rd(b...);
}
#ifndef MISAKA
#define err(...)
#else
#define err(...) fprintf(stderr, __VA_ARGS__)
#endif
typedef long long i64;
typedef unsigned long long u64;
typedef unsigned u32;
typedef long double dbl;
typedef pair<int, int> pii;
typedef uniform_int_distribution<int> r32;
typedef uniform_int_distribution<i64> r64;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
#define shuf(L, R) shuffle((L), (R), rng)
#define fi first
#define se second
#define pb push_back
#define eb emplace_back
#define FOR(i, j, k) for (int i = (j); i <= (k); ++i)
#define ROF(i, j, k) for (int i = (k); i >= (j); --i)
template <typename T> inline void ckmin(T &a, const T &b) { a = min(a, b); }
template <typename T> inline void ckmax(T &a, const T &b) { a = max(a, b); }
//#define IOFILE "e"
//#define MULTI
const int N = 3e5+5;

int a[N];
vector<int> g[N];
int ans;

void dfs(int u, int r) {
  if (r > 0 || a[u] > 0) ++ans;
  r = max(r-1, a[u]);
  for (auto v : g[u]) dfs(v, r);
}

inline void sol() {
  int n, m;
  rd(n, m);
  FOR(i,2,n) {
    int p;
    rd(p);
    g[p].pb(i);
  }
  FOR(i,1,m) {
    int x, y;
    rd(x, y);
    ckmax(a[x], y);
  }
  dfs(1, 0);
  O(ans);
}

int main() {
#ifndef MISAKA
#ifdef IOFILE
  freopen(IOFILE ".in", "r", stdin);
  freopen(IOFILE ".out", "w", stdout);
#endif
  ios::sync_with_stdio(0);
  cin.tie(0);
#endif
#ifdef MULTI
  int T;
  cin >> T;
  while (T--)
#endif
    sol();
  return 0;
}

提出情報

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