Submission #638717

#	Time	Username	Problem	Language	Result	Execution time	Memory
638717		jamezzz	Let's Win the Election (JOI22_ho_t3)	C++17	10 / 100	10 ms	320 KiB

Main

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

#define fi first
#define se second
#define sf scanf
#define pf printf
typedef long long ll;
typedef long double ld;
typedef pair<int,int> ii;

#define maxn 505
#define INF 1023456789

int n,k,a[maxn],b[maxn];
bool have[maxn];
vector<ii> v;
ld memo[maxn][maxn];

int main(){
	sf("%d%d",&n,&k);
	for(int i=0;i<n;++i){
		int x,y;
		sf("%d%d",&x,&y);
		if(y==-1)y=INF;
		v.push_back({x,y});
	}
	sort(v.begin(),v.end(),[](ii &a,ii &b){
		if(a.se==b.se)return a.fi>b.fi;
		else return a.se<b.se;
	});
	int num=0;
	for(int i=0;i<n;++i){
		tie(a[i],b[i])=v[i];
		if(b[i]!=INF)++num;
	}
	ld ans=INF;
	for(int ppl=0;ppl<=num;++ppl){
		ld cur=0;
		for(int i=0;i<ppl;++i){
			cur+=((ld)b[i])/((ld)i+1);
		}
		priority_queue<int,vector<int>,greater<int>> pq;
		for(int i=ppl;i<n;++i)pq.push(a[i]);
		for(int i=0;i<k-ppl;++i){
			cur+=((ld)pq.top())/((ld)ppl+1);
			pq.pop();
		}
		ans=min(ans,cur);
	}
	pf("%Lf\n",ans);
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:21:4: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |  sf("%d%d",&n,&k);
      |    ^
Main.cpp:24:5: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |   sf("%d%d",&x,&y);
      |     ^

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