Submission #625047

#	Time	Username	Problem	Language	Result	Execution time	Memory
625047		andrei_boaca	Board (CEOI13_board)	C++14	100 / 100	4 ms	1044 KiB

board

#include <bits/stdc++.h>
//#pragma GCC optimize("O3")
using namespace std;
auto START=chrono::steady_clock().now();
int mytime()
{
    auto END=chrono::steady_clock().now();
    int x=chrono::duration_cast<chrono::milliseconds> (END-START).count();
    return x;
}
int a,b;
string s;
int val[100005],lg;
char va[100005],vb[100005];
int lga,lgb;
void multiply()
{
    int last=lg%2;
    if(last==1)
        val[lg++]=1;
    else
        val[lg-1]++;
}
void divide()
{
    int last=lg%2;
    if(val[lg-1]==1)
        lg--;
    else
        val[lg-1]--;
}
void add()
{
    int last=lg%2;
    if(last==0)
    {
        if(val[lg-1]>1)
        {
            val[lg-1]--;
            val[lg++]=1;
        }
        else
        {
            lg--;
            val[lg-1]++;
        }
        return;
    }
    else
    {
        int nr1=val[lg-1];
        int nr0=val[lg-2];
        lg-=2;
        if(nr0==1)
        {
            val[lg-1]++;
            val[lg++]=nr1;
        }
        else
        {
            nr0--;
            val[lg++]=nr0;
            val[lg++]=1;
            val[lg++]=nr1;
        }
    }
}
void subtract()
{
    int last=lg%2;
    if(last==1)
    {
        if(val[lg-1]==1)
        {
            lg--;
            val[lg-1]++;
        }
        else
        {
            val[lg-1]--;
            val[lg++]=1;
        }
        return;
    }
    else
    {
        int nr0=val[lg-1];
        int nr1=val[lg-2];
        lg-=2;
        if(nr1==1)
        {
            val[lg-1]++;
            val[lg++]=nr0;
        }
        else
        {
            nr1--;
            val[lg++]=nr1;
            val[lg++]=1;
            val[lg++]=nr0;
        }
    }
}
int getniv(int x)
{
    for(int d=0;d<=62;d++)
    {
        int st=(1<<d);
        int dr=st*2-1;
        if(x>=st&&x<=dr)
            return d;
    }
    return -1;
}
vector<int> dif;
void getdif()
{
    dif.clear();
    int t=0;
    for(int i=lga-1;i>=0;i--)
    {
        int x=va[i]-t-vb[i];
        t=0;
        if(x<0)
        {
            x+=2;
            t=1;
        }
        dif.push_back(x);
    }
    while(!dif.empty()&&dif.back()==0)
        dif.pop_back();
    if(dif.empty())
        dif.push_back(0);
    reverse(dif.begin(),dif.end());
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin>>s;
    lg=1;
    val[0]=1;
    for(int i=0;i<s.size();i++)
    {
        char c=s[i];
        if(c=='1')
            multiply();
        if(c=='2')
        {
            multiply();
            add();
        }
        if(c=='U')
            divide();
        if(c=='L')
            subtract();
        if(c=='R')
            add();
    }
    for(int i=0;i<lg;i++)
    {
        if(i%2==0)
        {
            for(int j=1;j<=val[i];j++)
                va[lga++]=1;
        }
        else
        {
            for(int j=1;j<=val[i];j++)
                va[lga++]=0;
        }
    }
    cin>>s;
    lg=1;
    val[0]=1;
    for(int i=0;i<s.size();i++)
    {
        char c=s[i];
        if(c=='1')
            multiply();
        if(c=='2')
        {
            multiply();
            add();
        }
        if(c=='U')
            divide();
        if(c=='L')
            subtract();
        if(c=='R')
            add();
    }
    for(int i=0;i<lg;i++)
    {
        if(i%2==0)
        {
            for(int j=1;j<=val[i];j++)
                vb[lgb++]=1;
        }
        else
        {
            for(int j=1;j<=val[i];j++)
                vb[lgb++]=0;
        }
    }
    int rez=0;
    int ans=1e9;
    if(lga<lgb)
    {
        swap(va,vb);
        swap(lga,lgb);
    }
    while(lga>lgb)
    {
        rez++;
        lga--;
    }
    bool need=0;
    for(int i=0;i<lga;i++)
        if(va[i]!=vb[i])
        {
            if(va[i]<vb[i])
                need=1;
            break;
        }
    if(need)
        swap(va,vb);
    /*for(int i:va)
        cout<<i;
    cout<<'\n';
    for(int i:vb)
        cout<<i;
    cout<<'\n';*/
    getdif();
    while(dif.size()>2)
    {
        dif.pop_back();
        lga--;
        lgb--;
        rez+=2;
    }
    while(dif.size())
    {
        /*if(mytime()>=199)
        {
            cout<<ans;
            return 0;
        }*/
        getdif();
        int x=0;
        for(int i:dif)
            x=x*2+i;
        ans=min(ans,x+rez);
        if(x<=1)
            break;
        rez+=2;
        lga--;
        lgb--;
    }
    cout<<ans;
    return 0;
}

Compilation message (stderr)

board.cpp: In function 'void divide()':
board.cpp:26:9: warning: unused variable 'last' [-Wunused-variable]
   26 |     int last=lg%2;
      |         ^~~~
board.cpp: In function 'int main()':
board.cpp:144:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  144 |     for(int i=0;i<s.size();i++)
      |                 ~^~~~~~~~~
board.cpp:177:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  177 |     for(int i=0;i<s.size();i++)
      |                 ~^~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10