Submission #514280

#	Time	Username	Problem	Language	Result	Execution time	Memory
514280		amunduzbaev	Bulldozer (JOI17_bulldozer)	C++14	60 / 100	965 ms	66304 KiB

bulldozer

#include "bits/stdc++.h"
using namespace std;

#define ar array
#define int long long

const int N = 2005;
long double const eps = 1e-18;

struct ST{
	ar<int, 4> tree[N * 4];
	void merge(ar<int, 4>& x, ar<int, 4>& a, ar<int, 4>& b){
		x[0] = max({a[0], b[0], a[2] + b[1]});
		x[1] = max({a[1], a[3] + b[1]});
		x[2] = max({b[2], b[3] + a[2]});
		x[3] = a[3] + b[3];
	}
	
	void sett(int i, int v, int lx = 0, int rx = N, int x = 1){
		if(lx == rx){ 
			tree[x] = {max(v, 0ll), max(v, 0ll), max(v, 0ll), v}; return;
		} int m = (lx + rx) >> 1;
		if(i <= m) sett(i, v, lx, m, x<<1);
		else sett(i, v, m+1, rx, x<<1|1);
		merge(tree[x], tree[x<<1], tree[x<<1|1]);
	}
}tree;

signed main(){
	ios::sync_with_stdio(0); cin.tie(0);
	
	int n; cin>>n;
	vector<ar<int, 3>> a(n);
	for(int i=0;i<n;i++){
		cin>>a[i][0]>>a[i][1]>>a[i][2];
	} sort(a.begin(), a.end());
	
	vector<pair<long double, pair<int, int>>> tt;
	for(int i=0;i<n;i++){
		for(int j=i+1;j<n;j++){
			if(a[i][0] == a[j][0]) continue;
			double slop = (a[j][1] - a[i][1]) * 1. / (a[i][0] - a[j][0]);
			tt.push_back({slop, {i, j}});
		}
	}
	
	vector<long double> b(n);
	vector<int> p(n); iota(p.begin(), p.end(), 0);
	for(int i=0;i<n;i++){
		b[i] = a[i][1] * 1. - (a[i][0] * -2e9);
	}
	
	sort(p.begin(), p.end(), [&](int i, int j){
		return (eps < b[j] - b[i]);
	});
	
	vector<int> pos(n);
	for(int i=0;i<n;i++) pos[p[i]] = i, tree.sett(i, a[p[i]][2]);

	int res = tree.tree[1][0];
	sort(tt.begin(), tt.end());
	for(int l=0;l<(int)tt.size();){
		int k = l;
		while(k < (int)tt.size() && tt[k].first == tt[l].first){
			auto [i, j] = tt[k].second;
			swap(p[pos[i]], p[pos[j]]);
			swap(pos[i], pos[j]); k++;
			tree.sett(pos[i], a[i][2]), tree.sett(pos[j], a[j][2]);
		} l = k;
		
		res = max(res, tree.tree[1][0]);
	}
	
	cout<<res<<"\n";
}

Compilation message (stderr)

bulldozer.cpp: In function 'int main()':
bulldozer.cpp:65:9: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   65 |    auto [i, j] = tt[k].second;
      |         ^

• Subtask 1: 5 / 5
• Subtask 2: 20 / 20
• Subtask 3: 35 / 35
• Subtask 4: 0 / 20
• Subtask 5: 0 / 20