Submission #1283663

#	Time	Username	Problem	Language	Result	Execution time	Memory
1283663		Faisal_Saqib	별들과 삼각형 (IZhO11_triangle)	C++20	100 / 100	214 ms	24624 KiB

triangle

/* 
    VENI VIDI VICI
*/

// #pragma GCC optimize("Ofast","unroll-all-loops","fast-math","no-stack-protector","give-no-fuck")
#include <bits/stdc++.h>
// #include <iostream>
// #include <vector>
// #include <algorithm>
// #include <set>
// #include <map>

using namespace std;
#define fi first
#define se second
#define pb push_back
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()

#define rep(i,x, n) for (int i = (x); i < (n); ++i)
#define repr(i,x, n) for (int i = (n) - 1; i >= (x); --i)
mt19937 RNG(chrono::steady_clock::now().time_since_epoch().count());  
// #define sum accumulate

//using i128 = __int128;
using ll = long long;
using ull = unsigned long long;
using ld = long double;
using str = string;
using pi = pair<int, int>;
using pl = pair<ll, ll>;

using vi = vector<int>;
using vl = vector<ll>;
using vpi = vector<pair<int, int>>;
using vvi = vector<vi>;
using sll = set<ll>;

template<class T>
istream& operator>>(istream& is, vector<T>& v) {
    for(auto &i:v) is>>i;
    return is;
}
template<class T1,class T2>
istream& operator>>(istream& is, pair<T1,T2>& p) {
    is>>p.fi>>p.se;
    return is;
}
template<class T>
ostream& operator<<(ostream& os, const vector<T>& v) {
    for(const auto &i:v) os<<i<<' ';
    return os;
}
template<class T1,class T2>
ostream& operator<<(ostream& os, const pair<T1,T2>& p) {
    os<<p.fi<<' '<<p.se; return os;
}
void pyn(bool x)
{
    cout<<(x?"YES":"NO")<<endl;
}
void pYN(bool x)
{
    cout<<(x?"Yes":"No")<<endl;
}
void pAB(bool x)
{
    cout<<(x?"Alice":"Bob")<<endl;
}
ll powmod(ll a,ll b,ll modulo)
{
  if(b==0){
    return 1;
  }
  ll temp=powmod(a,b/2,modulo);
  if(b%2==0){
    return (temp*temp)%modulo;
  }
  else{
    return (a*((temp*temp)%modulo))%modulo;
  }
}
bool Prime(ll n){
    for (ll i = 2; i*i <= n; i++)
        if (n % i == 0)
            return false;
    return (n>1);
}
void readIO() {
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
}

void solve();

int main() {
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    // readIO();

    int uwu=1;

    // cin>>uwu;

    for(int tc=1;tc<=uwu;tc++) {
        // cout<<"Case #"<<tc<<": ";
        solve();
    }
    return 0;
}
const int N=3e5+10;
ll x[N],y[N],cx[N],cy[N];
vl xs[N],ys[N];
void solve()
{
    ll n;
    cin>>n;
    vl px,py;
    for(int i=0;i<n;i++)
    {
        cin>>x[i]>>y[i];
        px.push_back(x[i]);
        py.push_back(y[i]);
        // st[x[i]]
    }
    sort(all(px));
    sort(all(py));
    px.resize(unique(all(px))-begin(px));
    py.resize(unique(all(py))-begin(py));
    for(int i=0;i<n;i++)
    {
        cx[i]=lower_bound(all(px),x[i])-begin(px);
        cy[i]=lower_bound(all(py),y[i])-begin(py);
        xs[cx[i]].push_back(cy[i]);
        ys[cy[i]].push_back(cx[i]);
    }
    for(int i=0;i<N;i++)
    {
        sort(all(xs[i]));
        sort(all(ys[i]));
    }
    ll ans=0;
    for(int i=0;i<n;i++)
    {
        // auto it=end(xs[cx[i]])-upper_bound(all(xs[cx[i]]),cy[i]);
        ll it=xs[cx[i]].size() - (upper_bound(all(xs[cx[i]]),cy[i])-lower_bound(all(xs[cx[i]]),cy[i]));
        ll it1=ys[cy[i]].size() - (upper_bound(all(ys[cy[i]]),cx[i])-lower_bound(all(ys[cy[i]]),cx[i]));
        // auto it1=upper_bound(all(ys[cy[i]]),cx[i])-begin(ys[cy[i]]);
        // cout<<"For "<<i<<' '<<x[i]<<' '<<y[i]<<' '<<it<<' '<<it1<<endl;
        ans+=(1ll*it*it1);
        // all y such (x,y)  (x,y') y<y'
        // all x such (x,y)  (x',y)  x'<x
    }
    cout<<ans<<endl;
}

Compilation message (stderr)

triangle.cpp: In function 'void readIO()':
triangle.cpp:90:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   90 |     freopen("input.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
triangle.cpp:91:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   91 |     freopen("output.txt", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100