Submission #708214

#	Time	Username	Problem	Language	Result	Execution time	Memory
708214		segir187	Seesaw (JOI22_seesaw)	C++17	1 / 100	1 ms	328 KiB

seesaw

#include <bits/stdc++.h> //Grzegorz Krawczyk
using namespace std;
typedef unsigned long long LL;
typedef long double LD;
#define rep(a,b) for(int a=0;a<(b);a++)
#define rep2(a,b) for(int a=1;a<=(b);a++)
#define st first
#define nd second
#define pb push_back
#define mp make_pair
const int INF=INT_MAX/2;
const LL LINF=LLONG_MAX/2;
const int LIM=2e5+7;
///flagi kompilacji:
///g++ -std=c++17 -static -Wall -pedantic -O3 -s -lm -o see see.cpp
__int128 t[LIM];
__int128 SUM;
int n;

__int128 solve(__int128 P)
{
    __int128 sum=SUM;
    int m=n;
    __int128 K=sum/m;
    int pi=1,ki=n;
    while(pi!=ki)
    {
        __int128 csr=sum/m;
        m--;
        if((sum-t[ki])/m>=P)
        {
            sum-=t[ki--];
            K=max(K,sum/m);
        }
        else
        {
            sum-=t[pi++];
            K=max(K,sum/m);
        }
    }
    return K-P+1;
}
int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin>>n;
    rep2(i,n)
    {
        LL a;
        cin>>a;
        t[i]=a*LL(1e10);
        SUM+=t[i];
    }
    __int128 p=0,k=SUM/n+1;
    __int128 pw=solve(p);
    __int128 kw=LINF;
    kw*=kw;
    while(k-p>1)
    {
        __int128 sr=(p+k)/2;
        __int128 srw=solve(sr);
        if(srw<=pw)
        {
            pw=srw;
            p=sr;
        }
        else
        {
            kw=srw;
            k=sr;
        }
    }
    if(kw<pw)
    {
        swap(p,k);
        swap(pw,kw);
    }
    p=pw;
    __int128 BIL=1e10;
    __int128 pom=p/BIL;
    LL a=pom;
    cout<<a<<'.';
    pom=p%BIL;
    a=pom;
    int cnt=0;
    LL x=1;
    rep(i,10)
    {
        if(a/x==0) break;
        else cnt++;
    }
    a=pom;
    cnt=10-cnt;
    rep(i,cnt) cout<<'0';
    cout<<a<<'\n';
    return 0;
}

Compilation message (stderr)

seesaw.cpp: In function '__int128 solve(__int128)':
seesaw.cpp:28:18: warning: unused variable 'csr' [-Wunused-variable]
   28 |         __int128 csr=sum/m;
      |                  ^~~

• Subtask 1: 1 / 1
• Subtask 2: 0 / 33
• Subtask 3: 0 / 33
• Subtask 4: 0 / 33