Submission #316765

#	Time	Username	Problem	Language	Result	Execution time	Memory
316765		LifeHappen__	Sure Bet (CEOI17_sure)	C++14	100 / 100	95 ms	5244 KiB

sure

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rnd(int l,int r){return l+rng()%(r-l+1);}
#define forinc(a,b,c) for(int a=b, _c=c; a<=_c; ++a)
#define fordec(a,b,c) for(int a=b, _c=c; a>=_c; --a)
#define forv(a,b) for(auto &a:b)
#define fasty ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0)
#define ar array
#define ii pair<int,int>
#define fi first
#define se second
#define pb push_back
#define eb emplace_back
#define all(a) begin(a),end(a)
#define reset(f,x) memset(f,x,sizeof(f))
#define bit(x,i) (x>>(i-1)&1ll)
#define on(x,i) (x|(1ll<<(i-1)))
#define off(x,i) (x&~(1ll<<(i-1)))

const int N=1e5+5;
int n;
double a[N],b[N],x[N],y[N];

int32_t main(){
   fasty;

   cin>>n;
   forinc(i,1,n) cin>>a[i]>>b[i];
   sort(a+1, a+n+1); reverse(a+1, a+n+1);
   sort(b+1, b+n+1); reverse(b+1, b+n+1);
   forinc(i,1,n){
      x[i]=x[i-1]+a[i];
      y[i]=y[i-1]+b[i];
   }
   double ans=0;
   for(int i=1, j=1; i<=n; ++i){
      while(j<n && y[j]<x[i]) j++;
      ans=max(ans, min(y[j],x[i])-i-j);
   }
   for(int i=1, j=1; i<=n; ++i){
      while(j<n && x[j]<y[i]) j++;
      ans=max(ans, min(y[i],x[j])-i-j);
   }
   cout<<setprecision(4)<<fixed<<ans;
}

• Subtask 1: 20 / 20
• Subtask 2: 40 / 40
• Subtask 3: 40 / 40