Submission #598822

#	Time	Username	Problem	Language	Result	Execution time	Memory
598822		denniskim	Let's Win the Election (JOI22_ho_t3)	C++17	56 / 100	2626 ms	1048576 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;
ll k;
pair<ll, ll> a[510];
ld ans = INF;
ll chk[510];
ld dp[510][510][510];
ld gap[510];
ll l, r;

ld query(ll i)
{
	if(gap[i])
		return gap[i];
	
	for(ll j = 0 ; j <= n ; j++)
	{
		for(ll o = 0 ; o <= k ; o++)
		{
			for(ll oo = 0 ; oo <= i ; oo++)
				dp[j][o][oo] = 10000000;
		}
	}
	
	dp[0][0][0] = 0;
	
	for(ll j = 1 ; j <= n ; j++)
	{
		for(ll o = 0 ; o <= k ; o++)
		{
			for(ll oo = 0 ; oo <= i ; oo++)
			{
				dp[j][o][oo] = min(dp[j][o][oo], dp[j - 1][o][oo]);
				
				if(o >= 1)
					dp[j][o][oo] = min(dp[j][o][oo], dp[j - 1][o - 1][oo] + (ld)a[j].se / (ld)(i + 1));
				
				if(o >= 1 && oo >= 1)
					dp[j][o][oo] = min(dp[j][o][oo], dp[j - 1][o - 1][oo - 1] + (ld)a[j].fi / (ld)oo);
			}
		}
	}
	
	return gap[i] = dp[n][k][i];
}

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 = 1000000000;
	}
	
	sort(a + 1, a + 1 + n);
	
	l = 0, r = k;
	
	while(l + 2 < r)
	{
		ll mid1 = (l * 2 + r) / 3;
		ll mid2 = (l + r * 2) / 3;
		
		if(query(mid1) <= query(mid2))
			r = mid2;
		else
			l = mid1;
	}
	
	for(ll i = l ; i <= r ; i++)
		ans = min(ans, query(i));
	
	printf("%.10Lf", ans);
	return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:60:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |  scanf("%lld", &n);
      |  ~~~~~^~~~~~~~~~~~
Main.cpp:61:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |  scanf("%lld", &k);
      |  ~~~~~^~~~~~~~~~~~
Main.cpp:65:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |   scanf("%lld %lld", &a[i].se, &a[i].fi);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 11 / 11
• Subtask 4: 12 / 12
• Subtask 5: 33 / 33
• Subtask 6: 0 / 11
• Subtask 7: 0 / 23