Submission #544585

#	Time	Username	Problem	Language	Result	Execution time	Memory
544585		krit3379	Sure Bet (CEOI17_sure)	C++14	100 / 100	73 ms	3532 KiB

sure

#include<bits/stdc++.h>
using namespace std;
#define N 100005

double a[N],b[N],ans;

int main(){
    int n,i,l,r,mid;
    scanf("%d",&n);
    for(i=1;i<=n;i++)scanf("%lf %lf",&a[i],&b[i]);
    sort(a+1,a+n+1,greater<double>());
    sort(b+1,b+n+1,greater<double>());
    for(i=1;i<=n;i++)a[i]+=a[i-1],b[i]+=b[i-1];
    for(i=1;i<=2*n;i++){
        l=0,r=min(i,n);
        while(l<=r){
            mid=(l+r)/2;
            ans=max(ans,min(a[mid],b[min(i-mid,n)])-i);
            if(a[mid]>=b[min(i-mid,n)])r=mid-1;
            else l=mid+1;
        }
    }
    printf("%.4lf",ans);
    return 0;
}

Compilation message (stderr)

sure.cpp: In function 'int main()':
sure.cpp:9:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
sure.cpp:10:27: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |     for(i=1;i<=n;i++)scanf("%lf %lf",&a[i],&b[i]);
      |                      ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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