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Submission #514369

# Submission time Handle Problem Language Result Execution time Memory
514369 2022-01-18T07:12:23 Z amunduzbaev Bulldozer (JOI17_bulldozer) C++14
0 / 100
 2 ms 716 KB 
#include "bits/stdc++.h"
using namespace std;

#define ar array
#define int long long

const int N = 2005;
long double const eps = 1e-14;

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]);
	}
	
	int get(int i, int lx = 0, int rx = N, int x = 1){
		if(lx == rx) return tree[x][3];
		int m = (lx + rx) >> 1;
		if(i <= m) return get(i, lx, m, x<<1);
		else return get(i, m+1, rx, x<<1|1);
	}
}tree;

/*

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

Compilation message

bulldozer.cpp: In function 'int main()':
bulldozer.cpp:96:9: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   96 |    auto [i, j] = tt[k].second; k++;
      |         ^

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 716 KB Output is correct
2 Correct 2 ms 716 KB Output is correct
3 Correct 1 ms 716 KB Output is correct
4 Correct 1 ms 716 KB Output is correct
5 Correct 1 ms 716 KB Output is correct
6 Correct 1 ms 716 KB Output is correct
7 Correct 1 ms 716 KB Output is correct
8 Correct 1 ms 716 KB Output is correct
9 Correct 1 ms 716 KB Output is correct
10 Correct 2 ms 700 KB Output is correct
11 Correct 1 ms 332 KB Output is correct
12 Correct 1 ms 316 KB Output is correct
13 Correct 1 ms 320 KB Output is correct
14 Correct 0 ms 316 KB Output is correct
15 Incorrect 1 ms 300 KB Output isn't correct

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 700 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 35.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 700 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 700 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 716 KB Output is correct
2 Correct 2 ms 716 KB Output is correct
3 Correct 1 ms 716 KB Output is correct
4 Correct 1 ms 716 KB Output is correct
5 Correct 1 ms 716 KB Output is correct
6 Correct 1 ms 716 KB Output is correct
7 Correct 1 ms 716 KB Output is correct
8 Correct 1 ms 716 KB Output is correct
9 Correct 1 ms 716 KB Output is correct
10 Correct 2 ms 700 KB Output is correct
11 Correct 1 ms 332 KB Output is correct
12 Correct 1 ms 316 KB Output is correct
13 Correct 1 ms 320 KB Output is correct
14 Correct 0 ms 316 KB Output is correct
15 Incorrect 1 ms 300 KB Output isn't correct