結果

問題 No.778 クリスマスツリー
ユーザー ningenMe
提出日時 2020-01-22 01:57:02
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 122 ms / 2,000 ms
コード長 4,276 bytes
コンパイル時間 1,788 ms
コンパイル使用メモリ 174,664 KB
実行使用メモリ 25,076 KB
最終ジャッジ日時 2024-10-14 02:01:09
合計ジャッジ時間 3,459 ms
ジャッジサーバーID
(参考情報)
judge4 / judge2
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 12
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ull = unsigned long long;
#define REP(i,n) for(long long i = 0; i < (n); i++)
#define FOR(i, m, n) for(long long i = (m);i < (n); ++i)
#define ALL(obj) (obj).begin(),(obj).end()
#define SPEED cin.tie(0);ios::sync_with_stdio(false);
template<class T> using V = vector<T>;
template<class T, class U> using P = pair<T, U>;
template<class T> using PQ = priority_queue<T>;
template<class T> using PQR = priority_queue<T,vector<T>,greater<T>>;
constexpr long long MOD = (long long)1e9 + 7;
constexpr long long MOD2 = 998244353;
constexpr long long HIGHINF = (long long)1e18;
constexpr long long LOWINF = (long long)1e15;
constexpr long double PI = 3.1415926535897932384626433;
template <class T> vector<T> multivector(size_t N,T init){return vector<T>(N,init);}
template <class... T> auto multivector(size_t N,T... t){return vector<decltype(multivector(t...))>(N,multivector(t...));}
template <class T> void corner(bool flg, T hoge) {if (flg) {cout << hoge << endl; exit(0);}}
template <class T, class U>ostream &operator<<(ostream &o, const map<T, U>&obj) {o << "{"; for (auto &x : obj) o << " {" << x.first << " : " << x
    .second << "}" << ","; o << " }"; return o;}
template <class T>ostream &operator<<(ostream &o, const set<T>&obj) {o << "{"; for (auto itr = obj.begin(); itr != obj.end(); ++itr) o << (itr != obj
    .begin() ? ", " : "") << *itr; o << "}"; return o;}
template <class T>ostream &operator<<(ostream &o, const multiset<T>&obj) {o << "{"; for (auto itr = obj.begin(); itr != obj.end(); ++itr) o << (itr !
    = obj.begin() ? ", " : "") << *itr; o << "}"; return o;}
template <class T>ostream &operator<<(ostream &o, const vector<T>&obj) {o << "{"; for (int i = 0; i < (int)obj.size(); ++i)o << (i > 0 ? ", " : "")
    << obj[i]; o << "}"; return o;}
template <class T>ostream &operator<<(ostream &o, const deque<T>&obj) {o << "{"; for (int i = 0; i < (int)obj.size(); ++i)o << (i > 0 ? ", " : "") <<
    obj[i]; o << "}"; return o;}
template <class T, class U>ostream &operator<<(ostream &o, const pair<T, U>&obj) {o << "{" << obj.first << ", " << obj.second << "}"; return o;}
template <template <class tmp> class T, class U> ostream &operator<<(ostream &o, const T<U> &obj) {o << "{"; for (auto itr = obj.begin(); itr != obj
    .end(); ++itr)o << (itr != obj.begin() ? ", " : "") << *itr; o << "}"; return o;}
void print(void) {cout << endl;}
template <class Head> void print(Head&& head) {cout << head;print();}
template <class Head, class... Tail> void print(Head&& head, Tail&&... tail) {cout << head << " ";print(forward<Tail>(tail)...);}
template <class T> inline void chmax(T& a, const T b){a=max(a,b);}
template <class T> inline void chmin(T& a, const T b){a=min(a,b);}
void YN(bool flg) {cout << (flg ? "YES" : "NO") << endl;}
void Yn(bool flg) {cout << (flg ? "Yes" : "No") << endl;}
void yn(bool flg) {cout << (flg ? "yes" : "no") << endl;}
//Binary Indexed Tree
template<class Operator> class BinaryIndexedTree {
Operator Op; //Operator
using typeNode = decltype(Op.unitNode); //node
int N;
vector<typeNode> node;
public:
BinaryIndexedTree(int N) : N(N), node(N + 1, Op.unitNode) {
//do nothing
}
//[idx,idx+1)
void update(int idx, typeNode var) {
for (++idx; idx <= N; idx += idx & -idx) node[idx] = Op.funcMerge(node[idx],var);
}
//[0,idx)
typeNode getvar(int idx) {
typeNode ret = Op.unitNode;
for (; idx >= 1; idx -= idx & -idx) ret = Op.funcMerge(ret,node[idx]);
return ret;
}
};
template<class typeNode> struct nodeAddRangeSum {
typeNode unitNode = 0;
typeNode funcNode(typeNode l,typeNode r){return l+r;}
typeNode funcMerge(typeNode l,typeNode r){return l+r;}
};
//verify https://atcoder.jp/contests/chokudai_S001/tasks/chokudai_S001_j
vector<vector<int>> edge;
BinaryIndexedTree<nodeAddRangeSum<ll>> bit(200001);
ll ans = 0;
void dfs(int curr){
bit.update(curr,1);
ans += bit.getvar(curr);
for(int next:edge[curr]) dfs(next);
bit.update(curr,-1);
}
int main() {
int N; cin >> N;
edge.resize(N);
for(int i = 1; i < N; ++i){
int A; cin >> A;
edge[A].push_back(i);
}
dfs(0);
cout << ans << endl;
return 0;
}
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