oj.uz

Submission #888009

# Submission time Handle Problem Language Result Execution time Memory
888009 2023-12-15T18:39:47 Z Hakiers Let's Win the Election (JOI22_ho_t3) C++17
10 / 100
 370 ms 6664 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
constexpr int MAXN = 5e2 + 7;
constexpr ld oo = 1e9;
tuple<ld, ld, int> T[MAXN];
pair<ld, ld> TORG[MAXN];
pair<int, int> prevs[MAXN][MAXN];
ld dp[MAXN][MAXN];
bool blocked[MAXN];
ld sumA;
int n, k;

bool cmp1(tuple<ld, ld, int> a, tuple<ld, ld, int> b){
	auto [xa, ya, ia] = a;
	auto [xb, yb, ib] = b;
	
	if(ya != yb)
		return ya < yb;
	return xa < xb;
}

bool cmp2(tuple<ld, ld, int> a, tuple<ld, ld, int> b){
	auto [xa, ya, ia] = a;
	auto [xb, yb, ib] = b;
	
	if(xa != xb)
		return xa < xb;
	return ya < yb;
}

ld compute(ld val, ld l){
	return (sumA + val)/l;
}

void compute(){

	for(int i = 1; i <= n; i++){
		dp[i][1] = std::get<1>(T[i]) - std::get<0>(T[i]);
		prevs[i][1] = {0, std::get<2>(T[i])};
	}
	
		
	for(int l = 2; l <= k; l++){
		for(int i = l; i <= n; i++){
			ld actbest = (oo*oo);
			for(int j = l-1; j < i; j++){
				if(actbest > compute(dp[j][l-1] + dp[i][1], l)){
					prevs[i][l] = {j, std::get<2>(T[i])};
					dp[i][l] = dp[j][l-1] + dp[i][1];
					actbest = compute(dp[i][l], l);
				}
			}
		}
	}
}

vector<int> odtworz(int i, int l){
	vector<int> out;
	
	int pocz = i;
	
	while(l){
		out.push_back(prevs[pocz][l].second);
		//cout << "k: " << l << " " << out.back() << "\n";
		pocz = prevs[pocz][l--].first;
	}
	
	reverse(out.begin(), out.end());
	return out;
}

ld solve(){
	ld res = oo;
	sort(T+1, T+1+n, cmp2);
	
	for(int l = 0; l <= k-1; l++){
		for(int i = l; i <= n; i++){
			vector<int> odt = odtworz(i, l);
			ld act = 0;
			
			for(int z = 1; z <= l; z++){
				act += (TORG[odt[z-1]].second/z);
				blocked[odt[z-1]] = 1;
			}
			
			int it = k - l;
			
			for(int w = 1; w <= n && it > 0; w++){
				auto [xa, ya, ia] = T[w];
				if(blocked[ia]) continue;
				
				act += (xa / (l+1));
				it--;
			}
			
			for(auto u : odt)
				blocked[u] = 0;
			
			//cout << "k: " << l << " " << act << "\n";
			res = min(res, act);
		}
	}

	return res;
}

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cin >> n >> k;
	
	for(int i = 1; i <= n; i++){
		ld a, b;
		cin >> a >> b;
		sumA += a;
		if(b == -1) b = 1e9;
		TORG[i] = {a, b};
		T[i] = {a, b, i};
		
	}
	
	sort(T+1, T+1+n, cmp1);
	compute();
	
	cout << fixed << setprecision(9) << solve() << "\n";

}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2392 KB Output is correct
5 Correct 33 ms 6432 KB Output is correct
6 Correct 88 ms 6236 KB Output is correct
7 Correct 184 ms 6420 KB Output is correct
8 Correct 284 ms 6664 KB Output is correct
9 Correct 349 ms 6236 KB Output is correct
10 Correct 224 ms 6480 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2392 KB Output is correct
5 Correct 33 ms 6432 KB Output is correct
6 Correct 88 ms 6236 KB Output is correct
7 Correct 184 ms 6420 KB Output is correct
8 Correct 284 ms 6664 KB Output is correct
9 Correct 349 ms 6236 KB Output is correct
10 Correct 224 ms 6480 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 93 ms 6440 KB Output is correct
13 Correct 96 ms 6236 KB Output is correct
14 Correct 97 ms 6436 KB Output is correct
15 Correct 249 ms 6416 KB Output is correct
16 Correct 244 ms 6408 KB Output is correct
17 Correct 265 ms 6416 KB Output is correct
18 Correct 328 ms 6420 KB Output is correct
19 Correct 325 ms 6232 KB Output is correct
20 Correct 344 ms 6484 KB Output is correct

Subtask #3
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2392 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2512 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 1 ms 2392 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Incorrect 1 ms 2392 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #4
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2392 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2512 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 1 ms 2392 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Incorrect 1 ms 2392 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #5
0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2392 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2512 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 1 ms 2392 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Incorrect 1 ms 2392 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #6
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 370 ms 6416 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2392 KB Output is correct
5 Correct 33 ms 6432 KB Output is correct
6 Correct 88 ms 6236 KB Output is correct
7 Correct 184 ms 6420 KB Output is correct
8 Correct 284 ms 6664 KB Output is correct
9 Correct 349 ms 6236 KB Output is correct
10 Correct 224 ms 6480 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 93 ms 6440 KB Output is correct
13 Correct 96 ms 6236 KB Output is correct
14 Correct 97 ms 6436 KB Output is correct
15 Correct 249 ms 6416 KB Output is correct
16 Correct 244 ms 6408 KB Output is correct
17 Correct 265 ms 6416 KB Output is correct
18 Correct 328 ms 6420 KB Output is correct
19 Correct 325 ms 6232 KB Output is correct
20 Correct 344 ms 6484 KB Output is correct
21 Correct 1 ms 2392 KB Output is correct
22 Correct 1 ms 2392 KB Output is correct
23 Correct 1 ms 2396 KB Output is correct
24 Correct 1 ms 2396 KB Output is correct
25 Correct 1 ms 2512 KB Output is correct
26 Correct 1 ms 2396 KB Output is correct
27 Correct 1 ms 2396 KB Output is correct
28 Correct 1 ms 2396 KB Output is correct
29 Correct 1 ms 2392 KB Output is correct
30 Correct 1 ms 2396 KB Output is correct
31 Incorrect 1 ms 2392 KB Output isn't correct
32 Halted 0 ms 0 KB -