結果
| 問題 |
No.3128 Isosceles Triangle
|
| コンテスト | |
| ユーザー |
 mikam
|
| 提出日時 | 2025-05-17 14:22:27 |
| 言語 | C++23 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 383 ms / 2,500 ms |
| コード長 | 8,837 bytes |
| コンパイル時間 | 9,992 ms |
| コンパイル使用メモリ | 507,552 KB |
| 実行使用メモリ | 17,792 KB |
| 最終ジャッジ日時 | 2025-05-17 14:22:45 |
| 合計ジャッジ時間 | 13,388 ms |
|
ジャッジサーバーID （参考情報） |
judge2 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 30 |
ソースコード
#include <atcoder/all>
using namespace atcoder;
#include <atcoder/internal_math>
using namespace internal;
#include <bits/stdc++.h>
using namespace std;
#include <boost/multiprecision/cpp_int.hpp>
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rep2(i,a,b) for (int i = (int)(a); i < (int)(b); i++)
#define all(v) v.begin(),v.end()
#define inc(x,l,r) ((l)<=(x)&&(x)<(r))
#define Unique(x) sort(all(x)), x.erase(unique(all(x)), x.end())
#define pcnt __builtin_popcountll
#define pb push_back
typedef long long ll;
#define int ll
using ld = long double;
//using ld = __float128;
using vi = vector<int>;
using vs = vector<string>;
using P = pair<int,int>;
using vp = vector<P>;
using ull = unsigned long long;
using Bint = boost::multiprecision::cpp_int;
template<typename T1,typename T2> bool chmax(T1 &a, const T2 b) {if (a < b) {a = b; return true;} else return false; }
template<typename T1,typename T2> bool chmin(T1 &a, const T2 b) {if (a > b) {a = b; return true;} else return false; }
template<typename T> using priority_queue_greater = priority_queue<T, vector<T>, greater<T>>;
template<typename T1,typename T2> ostream &operator<< (ostream &os, const pair<T1,T2> &p){os << p.first <<" "<<p.second;return os;}
ostream &operator<< (ostream &os, const modint1000000007 &m){os << m.val();return os;}
istream &operator>> (istream &is, modint1000000007 &m){ll in;is>>in;m=in;return is;}
ostream &operator<< (ostream &os, const modint998244353 &m){os << m.val();return os;}
istream &operator>> (istream &is, modint998244353 &m){ll in;is>>in;m=in;return is;}
template<typename T> istream &operator>>(istream& is,vector<T> &v){for(T &in:v)is>>in;return is;}
template<class... T> void input(T&... a){(cin>> ... >> a);}
#ifdef LOCAL
template<typename T> ostream &operator<<(ostream &os,const vector<T> &v){os<<"\x1b[32m";rep(i,v.size())os<<v[i]<<(i+1!=v.size()?" ":"");os<<"\x1b[0m";return os;}
template<class T> int print(T& a){cout << "\x1b[32m"<< a<< '\n' << "\x1b[0m";return 0;}
template<class T,class... Ts> int print(const T&a, const Ts&... b){cout << "\x1b[32m" << a;(cout<<...<<(cout<<' ',b));cout<<'\n' << "\x1b[0m";return 0;}
#else
template<typename T> ostream &operator<<(ostream &os,const vector<T> &v){rep(i,v.size())os<<v[i]<<(i+1!=v.size()?" ":"");return os;}
template<class T> int print(T& a){cout << a<< '\n';return 0;}
template<class T,class... Ts> int print(const T&a, const Ts&... b){cout << a;(cout<<...<<(cout<<' ',b));cout<<'\n';return 0;}
#endif
#define VI(v,n) vi v(n); input(v)
#define INT(...) int __VA_ARGS__; input(__VA_ARGS__)
#define STR(...) string __VA_ARGS__; input(__VA_ARGS__)
#define CHAR(...) char __VA_ARGS__; input(__VA_ARGS__)
int sign(ll x){return x>0?1:x<0?-1:0;}
ll ceil(ll x,ll y){assert(y!=0);if(sign(x)==sign(y))return (x+y-1)/y;return -((-x/y));}
ll floor(ll x,ll y){assert(y!=0);if(sign(x)==sign(y))return x/y;if(y<0)x*=-1,y*=-1;return x/y-(x%y<0);}
ll abs(ll x,ll y){return abs(x-y);}
ll bit(int n){return 1ll<<n;}
template<class T> bool ins(string s,T t){return s.find(t)!=string::npos;}
P operator+ (const P &p, const P &q){ return P{p.first+q.first,p.second+q.second};}
P operator- (const P &p, const P &q){ return P{p.first-q.first,p.second-q.second};}
int yesno(bool ok,string y="Yes",string n="No"){ cout<<(ok?y:n)<<endl;return 0;}
int YESNO(bool ok,string y="YES",string n="NO"){ cout<<(ok?y:n)<<endl;return 0;}
int takao(bool takahashi){return yesno(takahashi,"Takahashi","Aoki");}
struct __m___m__ {__m___m__(){cin.tie(0);ios_base::sync_with_stdio(false);cout << fixed << setprecision(20);}} _m_m_;
int di[]={0,1,0,-1,-1,-1,1,1};
int dj[]={1,0,-1,0,-1,1,-1,1};
const ll INF = 8e18;
//using mint = modint1000000007;
using mint = modint998244353;
//mint stom(const string &s,int b=10){mint res = 0;for(auto c:s)res *= b,res += c-'0';return res;}
template <class S, S (*op)(S, S), S (*e)()> class dynamic_segtree {
public:
dynamic_segtree(ll n) : n(n), root(nullptr) {}
void set(ll p, S x) {
assert(p < n);
set(root, 0, n, p, x);
}
S get(ll p) const {
assert(p < n);
return get(root, 0, n, p);
}
S prod(ll l, ll r) const {
assert(l <= r && r <= n);
return prod(root, 0, n, l, r);
}
S all_prod() const { return root ? root->product : e(); }
void reset(ll l, ll r) {
assert(l <= r && r <= n);
return reset(root, 0, n, l, r);
}
template <bool (*f)(S)> ll max_right(ll l) const {
return max_right(l, [](S x) { return f(x); });
}
template <class F> ll max_right(ll l, const F& f) const {
assert(l <= n);
S product = e();
assert(f(product));
return max_right(root, 0, n, l, f, product);
}
template <bool (*f)(S)> ll min_left(ll r) const {
return min_left(r, [](S x) { return f(x); });
}
template <class F> ll min_left(ll r, const F& f) const {
assert(r <= n);
S product = e();
assert(f(product));
return min_left(root, 0, n, r, f, product);
}
private:
struct node;
using node_ptr = std::unique_ptr<node>;
struct node {
ll index;
S value, product;
node_ptr left, right;
node(ll index, S value)
: index(index),
value(value),
product(value),
left(nullptr),
right(nullptr) {}
void update() {
product = op(op(left ? left->product : e(), value),
right ? right->product : e());
}
};
const ll n;
node_ptr root;
void set(node_ptr& t, ll a, ll b, ll p, S x) const {
if (!t) {
t = std::make_unique<node>(p, x);
return;
}
if (t->index == p) {
t->value = x;
t->update();
return;
}
ll c = (a + b) >> 1;
if (p < c) {
if (t->index < p) std::swap(t->index, p), std::swap(t->value, x);
set(t->left, a, c, p, x);
} else {
if (p < t->index) std::swap(p, t->index), std::swap(x, t->value);
set(t->right, c, b, p, x);
}
t->update();
}
S get(const node_ptr& t, ll a, ll b, ll p) const {
if (!t) return e();
if (t->index == p) return t->value;
ll c = (a + b) >> 1;
if (p < c) return get(t->left, a, c, p);
else return get(t->right, c, b, p);
}
S prod(const node_ptr& t, ll a, ll b, ll l, ll r) const {
if (!t || b <= l || r <= a) return e();
if (l <= a && b <= r) return t->product;
ll c = (a + b) >> 1;
S result = prod(t->left, a, c, l, r);
if (l <= t->index && t->index < r) result = op(result, t->value);
return op(result, prod(t->right, c, b, l, r));
}
void reset(node_ptr& t, ll a, ll b, ll l, ll r) const {
if (!t || b <= l || r <= a) return;
if (l <= a && b <= r) {
t.reset();
return;
}
ll c = (a + b) >> 1;
reset(t->left, a, c, l, r);
reset(t->right, c, b, l, r);
t->update();
}
template <class F>
ll max_right(const node_ptr& t, ll a, ll b,
ll l, const F& f, S& product) const {
if (!t || b <= l) return n;
if (f(op(product, t->product))) {
product = op(product, t->product);
return n;
}
ll c = (a + b) >> 1;
ll result = max_right(t->left, a, c, l, f, product);
if (result != n) return result;
if (l <= t->index) {
product = op(product, t->value);
if (!f(product)) return t->index;
}
return max_right(t->right, c, b, l, f, product);
}
template <class F>
ll min_left(const node_ptr& t, ll a, ll b,
ll r, const F& f, S& product) const {
if (!t || r <= a) return 0;
if (f(op(t->product, product))) {
product = op(t->product, product);
return 0;
}
ll c = (a + b) >> 1;
ll result = min_left(t->right, c, b, r, f, product);
if (result != 0) return result;
if (t->index < r) {
product = op(t->value, product);
if (!f(product)) return t->index + 1;
}
return min_left(t->left, a, c, r, f, product);
}
};
using S = int;
S op(int a,int b){return a+b;}
S e(){return 0;}
using Seg = dynamic_segtree<S,op,e>;
signed main() {
INT(n);
Seg seg(2e9+1);
vi a(n);cin>>a;
rep(i,n)seg.set(a[i],seg.get(a[i])+1);
int res = 0;
Unique(a);
for(auto e:a){
int cnt = seg.get(e);
int can = seg.prod(1,2*e) - cnt;
res += cnt*(cnt-1)/2 * can;
}
print(res);
return 0;
}