//Let's join Kaede Takagaki Fan Club !!
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <cmath>
#include <ctime>
#include <cassert>
#include <string>
#include <algorithm>
#include <vector>
#include <queue>
#include <stack>
#include <functional>
#include <iostream>
#include <map>
#include <set>
#include <unordered_map>
#include <unordered_set>
#include <cassert>
#include <iomanip>
#include <chrono>
#include <random>
#include <bitset>
#include <complex>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <atcoder/segtree>
using namespace std;
using namespace atcoder;
#define int long long
//#define L __int128
typedef long long ll;
typedef pair<int,int> P;
typedef pair<int,P> P1;
typedef pair<P,P> P2;
#define pu push
#define pb push_back
#define eb emplace_back
#define mp make_pair
#define eps 1e-7
#define INF 1000000000
#define a first
#define b second
#define fi first
#define sc second
//#define rng(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define rep(i,x) for(int i=0;i<x;i++)
#define repn(i,x) for(int i=1;i<=x;i++)
#define SORT(x) sort(x.begin(),x.end())
#define ERASE(x) x.erase(unique(x.begin(),x.end()),x.end())
#define POSL(x,v) (lower_bound(x.begin(),x.end(),v)-x.begin())
#define POSU(x,v) (upper_bound(x.begin(),x.end(),v)-x.begin())
#define all(x) x.begin(),x.end()
#define si(x) int(x.size())
#define pcnt(x) __builtin_popcountll(x)
#ifdef LOCAL
#define dmp(x) cerr<<__LINE__<<" "<<#x<<" "<<x<<endl
#else
#define dmp(x) void(0)
#endif
template<class t,class u> bool chmax(t&a,u b){if(a<b){a=b;return true;}else return false;}
template<class t,class u> bool chmin(t&a,u b){if(b<a){a=b;return true;}else return false;}
template<class t> using vc=vector<t>;
template<class t,class u>
ostream& operator<<(ostream& os,const pair<t,u>& p){
return os<<"{"<<p.fi<<","<<p.sc<<"}";
}
template<class t> ostream& operator<<(ostream& os,const vc<t>& v){
os<<"{";
for(auto e:v)os<<e<<",";
return os<<"}";
}
//https://codeforces.com/blog/entry/62393
struct custom_hash {
static uint64_t splitmix64(uint64_t x) {
// http://xorshift.di.unimi.it/splitmix64.c
x += 0x9e3779b97f4a7c15;
x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
return x ^ (x >> 31);
}
size_t operator()(uint64_t x) const {
static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
return splitmix64(x + FIXED_RANDOM);
}
//don't make x negative!
size_t operator()(pair<int,int> x)const{
return operator()(uint64_t(x.first)<<32|x.second);
}
};
//unordered_set -> dtype, null_type
//unordered_map -> dtype(key), dtype(value)
using namespace __gnu_pbds;
template<class t,class u>
using hash_table=gp_hash_table<t,u,custom_hash>;
template<class T>
void g(T &a){
cin >> a;
}
template<class T>
void o(const T &a,bool space=false){
cout << a << (space?' ':'\n');
}
//ios::sync_with_stdio(false);
const ll mod = 998244353;
//const ll mod = 1000000007;
mt19937_64 mt(chrono::steady_clock::now().time_since_epoch().count());
template<class T>
void add(T&a,T b){
a+=b;
if(a >= mod) a-=mod;
}
ll modpow(ll x,ll n){
ll res=1;
while(n>0){
if(n&1) res=res*x%mod;
x=x*x%mod;
n>>=1;
}
return res;
}
#define _sz 1
ll F[_sz],R[_sz];
void make(){
F[0] = 1;
for(int i=1;i<_sz;i++) F[i] = F[i-1]*i%mod;
R[_sz-1] = modpow(F[_sz-1], mod-2);
for(int i=_sz-2;i>=0;i--) R[i] = R[i+1] * (i+1) % mod;
}
ll C(int a,int b){
if(b < 0 || a < b) return 0;
return F[a]*R[b]%mod*R[a-b]%mod;
}
//o(ans?"Yes":"No");
//internal, prefix, suffix, sum
using S = array<int, 4>;
S op(S a, S b){
S c{};
c[3] = a[3] + b[3];
c[2] = max(b[2], a[2]+b[3]);
c[1] = max(a[1], a[3]+b[1]);
c[0] = max(max(a[0], b[0]), a[2]+b[1]);
return c;
}
S e(){
return S{(int)-1e18, (int)-1e18, (int)-1e18, 0};
}
int n, x[2005], y[2005], c[2005];
void solve(){
cin >> n;
vc<P1>vec(n);
rep(i, n) cin >> vec[i].b.a >> vec[i].b.b >> vec[i].a;
sort(all(vec), [](P1 a, P1 b){
return mp(a.b.b, a.b.a) < mp(b.b.b, b.b.a);
});
using d = long double;
vc<pair<d,P>>ev;
rep(i, n) for(int j=i+1;j<n;j++){
auto p1 = vec[i].b;
auto p2 = vec[j].b;
if(p1 > p2) swap(p1, p2);
int dx = p2.a - p1.a;
int dy = p2.b - p1.b;
if(p1.b <= p2.b){
ev.eb(atan2((d)dy, (d)dx), mp(i, j));
}
else{
ev.eb(atan2((d)dy*-1, (d)dx*-1), mp(i, j));
}
}
SORT(ev);
segtree<S, op, e>seg(n+2);
rep(i, vec.size()){
int a = vec[i].a;
seg.set(i, S{max(0LL,a), max(0LL,a), max(0LL,a), a});
}
vc<int>ar(n), rev(n);
rep(i, n) ar[i] = rev[i] = i;
int ans = seg.all_prod().at(0);
rep(_, ev.size()){
d deg = ev[_].a;
int u = ev[_].b.a;
int v = ev[_].b.b;
if(rev[u] < rev[v]){
//swap
seg.set(rev[u], S{max(0LL, vec[v].a), max(0LL, vec[v].a), max(0LL, vec[v].a), vec[v].a});
seg.set(rev[v], S{max(0LL, vec[u].a), max(0LL, vec[u].a), max(0LL, vec[u].a), vec[u].a});
swap(rev[u], rev[v]);
swap(ar[rev[u]], ar[rev[v]]);
}
if(_+1 == ev.size() or ev[_].a+1e-12 < ev[_+1].a){
chmax(ans, seg.all_prod().at(0));
}
}
o(ans);
}
signed main(){
cin.tie(0);
ios::sync_with_stdio(0);
cout<<fixed<<setprecision(20);
int t; t = 1; //cin >> t;
while(t--) solve();
}
Compilation message
bulldozer.cpp:29:10: fatal error: atcoder/segtree: No such file or directory
29 | #include <atcoder/segtree>
| ^~~~~~~~~~~~~~~~~
compilation terminated.
