Submission #659850

#	Time	Username	Problem	Language	Result	Execution time	Memory
659850		Savu_Stefan_Catalin	Remittance (JOI19_remittance)	C++14	55 / 100	1100 ms	39460 KiB

remittance

#include <iostream>
#include <algorithm>
using namespace std;
long long e[1005005],i,ok1,ok2,a[1005005],b[1005005],n,d[1005005],pp[1001],f[1000005],p;
void make()
{
    long long t=0,i;
    for (i=1;(i<=e[0]||t)&&i<=1005004;++i)
    {
        e[i]+=t;
        t=0;
        if (e[i]>=0) {t=e[i]/2; e[i]%=2;}
        else {t=(e[i]-1)/2; e[i]=(e[i]%2+2)%2;}
    }
    e[0]=i-1;
    if (i>1005000) e[0]=1,e[1]=-1;
    else while (e[e[0]]==0&&e[0]!=0) e[0]--;
}
int main()
{
    ios_base::sync_with_stdio(NULL);
    cin.tie(0);
    cout.tie(0);
    cin>>n;
    for (i=1;i<=n;++i)
    {
        cin>>a[i];
        if (a[i]!=0) ok1=1;
        cin>>b[i];
        if (b[i]!=0) ok2=1;
        d[i]=a[i]-b[i];
        e[i]=d[i];
    }
    e[0]=n;
    if (!ok1&&!ok2) {cout<<"Yes"; return 0;}
    else if (!ok2) {cout<<"No"; return 0;}
    make();
    while (true)
    {
                if (e[0]==0) { break;}
        if (e[e[0]]<0) {cout<<"No"; return 0;}
        if (e[1]==0) {pp[++pp[0]]=0; for (i=1;i<e[0];++i)  e[i]=e[i+1]; e[e[0]]=0; e[0]--;}
        else
        {
            pp[++pp[0]]=1;
            for (i=1;i<=n;++i)
                e[i]--;
            e[0]=max(e[0],n);
            make();
        }
    }
    reverse(pp+1,pp+pp[0]+1);
    for (i=1;i<=pp[0];++i)
    {
        if (pp[i]==0) p*=2;
        else p++;
    }
    f[n]=p;
    for (i=n;i>=2;--i)
    {
        f[i-1]=f[i]*2-d[i];
        if (f[i-1]<0) {cout<<"No"; return 0;}
    }
    cout<<"Yes";
    return 0;
}

• Subtask 1: 15 / 15
• Subtask 2: 40 / 40
• Subtask 3: 0 / 45