Submission #603949

#	Time	Username	Problem	Language	Result	Execution time	Memory
603949		denniskim	Let's Win the Election (JOI22_ho_t3)	C++17	100 / 100	651 ms	4428 KiB

Main

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef __int128 lll;
typedef long double ld;
#define MAX 9223372036854775807LL
#define MIN -9223372036854775807LL
#define INF 0x3f3f3f3f3f3f3f3f
#define fi first
#define se second

ll n, k;
pair<ll, ll> a[510];
vector<ll> vec;
ll suma[510];
ld ans = INF;
ld dp[510][510];

int main(void)
{
	scanf("%lld", &n);
	scanf("%lld", &k);
	
	for(ll i = 1 ; i <= n ; i++)
	{
		scanf("%lld %lld", &a[i].se, &a[i].fi);
		
		if(a[i].fi == -1)
			a[i].fi = 10000000000;
		
		a[i].se *= -1;
	}
	
	sort(a + 1, a + 1 + n);
	
	for(ll i = 1 ; i <= n ; i++)
		a[i].se *= -1;
	
	for(ll i = n ; i >= 0 ; i--)
	{
		sort(vec.begin(), vec.end());
		
		for(ll j = i ; j < k ; j++)
			suma[i] += vec[j - i];
		
		vec.push_back(a[i].se);
	}
	
	for(ll i = 0 ; i <= k ; i++)
	{
		for(ll j = 0 ; j <= n ; j++)
		{
			for(ll o = 0 ; o <= n ; o++)
				dp[j][o] = INF;
		}
		
		dp[0][0] = 0;
		
		for(ll j = 1 ; j <= n ; j++)
		{
			dp[j][0] = dp[j - 1][0] + (ld)a[j].se / (ld)(i + 1);
			
			for(ll o = 1 ; o <= i ; o++)
				dp[j][o] = min(dp[j - 1][o] + (ld)a[j].se / (ld)(i + 1), dp[j - 1][o - 1] + (ld)a[j].fi / (ld)o);
		}
		
		for(ll j = i ; j <= n ; j++)
			ans = min(ans, dp[j][i] + (ld)suma[j] / (ld)(i + 1));
	}
	
	printf("%.10Lf", ans);
	return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:22:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |  scanf("%lld", &n);
      |  ~~~~~^~~~~~~~~~~~
Main.cpp:23:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |  scanf("%lld", &k);
      |  ~~~~~^~~~~~~~~~~~
Main.cpp:27:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |   scanf("%lld %lld", &a[i].se, &a[i].fi);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 11 / 11
• Subtask 4: 12 / 12
• Subtask 5: 33 / 33
• Subtask 6: 11 / 11
• Subtask 7: 23 / 23