Submission #534885

#	Time	Username	Problem	Language	Result	Execution time	Memory
534885		nathanlee726	Let's Win the Election (JOI22_ho_t3)	C++14	0 / 100	341 ms	4268 KiB

Main

//#include<i_am_noob_orz>
#include<bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;
#define ll long long
#define int ll
#define ull unsigned long long
#define pii pair<int,int>
#define X first
#define Y second
#define mod ((ll)1e9+7)
#define pb push_back
#define mp make_pair
#define abs(x) ((x)>0?(x):(-(x)))
#define F(n) Fi(i,n)
#define Fi(i,n) Fl(i,0,n)
#define Fl(i,l,n) for(int i=l;i<n;i++)
#define memres(a) memset(a,0,sizeof(a))
#define all(a) a.begin(),a.end()
#define sz(a) ((int)a.size())
#define ceiling(a,b) (((a)+(b)-1)/(b))
#define endl '\n'
#define bit_count(x) __builtin_popcountll((x))
#define ykh mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
#define jimmy_is_kind false
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> rbtree;

//#define LOCAL
#ifdef LOCAL
#define bug(...) cerr<<"#"<<__LINE__<<' '<<#__VA_ARGS__<<"- ", _do(__VA_ARGS__)
template<typename T> void _do(T && x) {cerr<<x<<endl;}
template<typename T, typename ...S> void _do(T && x, S&&...y) {cerr<<x<<", "; _do(y...);}
#define IOS()
#else
#define IOS() ios_base::sync_with_stdio(0), cin.tie(0)
#define endl '\n'
#define bug(...)
#endif

int add(int a,int b){return(a+b>=mod?a+b-mod:a+b);}
int sub(int a,int b){return(a<b?a+mod-b:a-b);}
int po(int a,int b){
	if(b==0)return 1;
	if(b==1)return(a%mod);
	int tem=po(a,b/2);
	if(b&1)return(((tem*tem)%mod)*a)%mod;
	else return(tem*tem)%mod;
}
int GCD(int a,int b){
	int x=0;
	int ra,rb;
	while(a&&b){
		if(((a&1)==0)&&((b&1)==0)){
			a>>=1,b>>=1,x++;
		}
		else if((a^b)&1){
			if(a&1)b>>=1;
			else a>>=1;
		}
		else{
			ra=abs(a-b),rb=min(a,b);
			a=ra,b=rb;
		}
	}
	return max(a,b)<<x;
}
int gcd(int a,int b){if(b==0)return a;return gcd(b,a%b);}

int n,k;
pii pt[505],pt2[505];
vector<pii>pt1;
double dp[505][505],tdp[505][505];

bool cmp(pii a,pii b){
    if(a.Y==-1&&b.Y==-1){
        return a.X<b.X;
    }
    if(a.Y==-1){
        return false;
    }
    if(b.Y==-1)return true;
    return a.Y<b.Y;
}

signed main(){
	IOS();
	cin>>n>>k;
	F(n)cin>>pt[i].X>>pt[i].Y;
	sort(pt,pt+n,cmp);
	F(n)Fi(j,n)dp[i][j]=tdp[i][j]=-1;
	bug(dp[0][0]);
	dp[0][0]=0;
	F(n){
        for(int j=0;j<n;j++){
            for(int l=0;l<n;l++){
                if(dp[j][l]==-1)continue;
                tdp[j][l]=(tdp[j][l]==-1?dp[j][l]:min(dp[j][l],tdp[j][l]));
                if(pt[i].Y!=-1)tdp[j+1][l]=(tdp[j+1][l]==-1?dp[j][l]+(((double)pt[i].Y)/((double)(j+1))):min(tdp[j+1][l],dp[j][l]+(((double)pt[i].Y)/((double)(j+1)))));
                tdp[j][l+1]=(tdp[j][l+1]==-1?dp[j][l]+(((double)pt[i].X)/((double)(j+1))):min(tdp[j][l+1],dp[j][l]+(((double)pt[i].X)/((double)(j+1)))));
            }
        }
        Fi(j,n)Fi(l,n)dp[j][l]=tdp[j][l],tdp[j][l]=-1;
	}
	double ans=1e18;
	F(k)if(dp[i][k-1]!=-1)ans=min(ans,dp[i][k-i]);
	cout<<fixed<<setprecision(10);
	cout<<ans<<endl;
	return 0;
}

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