제출 #514540

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
514540		amunduzbaev	Bulldozer (JOI17_bulldozer)	C++14	25 / 100	2005 ms	66192 KiB

bulldozer

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

#define ar array

const int N = 2005;
long double const eps = 1e-16;

struct ST{
	ar<long long, 4> tree[N * 4];
	void merge(ar<long long, 4>& x, ar<long long, 4>& a, ar<long long, 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, 0), max(v, 0), max(v, 0), 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;

/*

5
5 1 5
4 2 2
3 3 -2
2 4 3
1 5 -1

6
2 2 10
4 1 10
5 2 10
2 5 10
4 4 -5
5 5 10

*/

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(), [&](auto& a, auto& b){
		if(a[0] != b[0]) return a[0] < b[0];
		return a[1] > b[1];
	});
	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;
			long double slop = (a[j][1] - a[i][1]) * 1. / (a[i][0] - a[j][0]);
			tt.push_back({slop, {i, j}});
		}
	} vector<int> pos(n), used(n);
	for(int i=0;i<n;i++) pos[i] = i, tree.sett(i, a[i][2]);
	long long res = tree.tree[1][0];
	sort(tt.begin(), tt.end(), [&](auto& a, auto& b){
		if(a.first != b.first) return a.first < b.first;
		return a.second.second - a.second.first > b.second.second - b.second.first;
	}); for(int l=0;l<(int)tt.size();){
		int k = l;
		while(k < (int)tt.size() && abs(tt[l].first - tt[k].first) < eps){
			auto [i, j] = tt[k].second; k++;
			if(used[j] || used[i]) continue;
			used[i] = used[j] = 1; swap(pos[i], pos[j]);
			tree.sett(pos[i], a[i][2]), 
			tree.sett(pos[j], a[j][2]);
		} while(l < k) used[tt[l].second.first] = used[tt[l].second.second] = 0, l++;
		res = max(res, tree.tree[1][0]);
	}
	
	for(auto& x : a) swap(x[0], x[1]);
	sort(a.begin(), a.end(), [&](auto& a, auto& b){
		if(a[0] != b[0]) return a[0] < b[0];
		return a[1] > b[1];
	}); tt.clear();
	for(int i=0;i<n;i++){
		for(int j=i+1;j<n;j++){
			if(a[i][0] == a[j][0]) continue;
			long double slop = (a[j][1] - a[i][1]) * 1. / (a[i][0] - a[j][0]);
			tt.push_back({slop, {i, j}});
		}
	} fill(used.begin(), used.end(), 0);
	for(int i=0;i<n;i++) pos[i] = i, tree.sett(i, a[i][2]);
	res = max(res, tree.tree[1][0]);
	sort(tt.begin(), tt.end(), [&](auto& a, auto& b){
		if(a.first != b.first) return a.first < b.first;
		return a.second.second - a.second.first > b.second.second - b.second.first;
	}); for(int l=0;l<(int)tt.size();){
		int k = l;
		while(k < (int)tt.size() && abs(tt[l].first - tt[k].first) < eps){
			auto [i, j] = tt[k].second; k++;
			if(used[j] || used[i]) continue;
			used[i] = used[j] = 1; swap(pos[i], pos[j]);
			tree.sett(pos[i], a[i][2]), 
			tree.sett(pos[j], a[j][2]);
		} while(l < k) used[tt[l].second.first] = used[tt[l].second.second] = 0, l++;
		res = max(res, tree.tree[1][0]);
	}
	
	cout<<res<<"\n";
}

컴파일 시 표준 에러 (stderr) 메시지

bulldozer.cpp: In function 'int main()':
bulldozer.cpp:76:9: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   76 |    auto [i, j] = tt[k].second; k++;
      |         ^
bulldozer.cpp:105:9: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  105 |    auto [i, j] = tt[k].second; k++;
      |         ^

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