Submission #1149617

#	Time	Username	Problem	Language	Result	Execution time	Memory
1149617		modwwe	Counting Mushrooms (IOI20_mushrooms)	C++20	92.62 / 100	3 ms	576 KiB

mushrooms

//#include "gap.h"
#include "mushrooms.h"
#pragma GCC optimize("Ofast,unroll-loops")
#include<bits/stdc++.h>
//#define int   long long
#define ll long long
#define down cout<<'\n';
#define debug cout<<" cucuucucuuu",down
#define modwwe  int t;cin>>t; while(t--)
#define bit(i,j) (i>>j&1)
#define sobit(a) __builtin_popcountll(a)
#define task2 "ftree"
#define task "test"
#define fin(x) freopen(x".inp","r",stdin)
#define fou(x) freopen(x".out","w",stdout)
#define pb push_back
#define mask(k) (1<<k)
#define checktime   cerr << (double)clock() / CLOCKS_PER_SEC * 1000  << " ms";
using namespace std;
#define getchar_unlocked getchar
mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
int rand(int l,int r)
{
    return uniform_int_distribution<int>(l,r)(rd);
}
void phongbeo();
const int inf = 1e16;
const ll mod2 = 1e9+7;
const ll base=67;
int  n, m, s1, s2, s4, s3, sf, k, s5, s6, mx, s7, s8, s9, mx2, res, dem2 = 0, dem = 0, s33, dem3, dem4, mid, l2, r2, center;
int  i, s10, s12,k1,k2,k3,s11,lim,w,l,r ;
int kk;
int t;
int el = 19;/*
main()
{
    if(fopen(task2".inp","r"))
    {
        fin(task2);
        fou(task2);
    }
    if(fopen(task".inp","r"))
    {
        fin(task);
        fou(task);
    }
    ios_base::sync_with_stdio(0);
    cout.tie(0);
    cin.tie(0);
    /// cin>>s1;
//int t;cin>>t; while(t--)
    phongbeo();
    // checktime
}*/
vector<int> b,c,v;
int a[20000];
/*int use_machine(vector<int> v)
{
    dem2++;
    int s=0;
    for(int i=0; i<v.size()-1; i++)
        s+=(a[v[i]]!=a[v[i+1]]);
    return s;
}*/
int count_mushrooms(int N)
{
    n=N;
    b.pb(0);
    for(int i=1; i<n; i++)
        v.pb(i);
    int s=0;
    shuffle(v.begin(),v.end(),rd);
    while(max(c.size(),b.size())<=87&&s<v.size())
    {
        if(max(c.size(),b.size())==1||s==v.size()-1)
        {
            int x=use_machine({b[0],v[s]});
            if(!x)b.pb(v[s]);
            else c.pb(v[s]);
            s++;
        }
        else
        {
            if(b.size()>=2)
            {
                int x=use_machine({b[0],v[s],b[1],v[s+1]});
                if(!bit(x,0))b.pb(v[s+1]);
                else c.pb(v[s+1]);
                if(!bit(x,1))b.pb(v[s]);
                else c.pb(v[s]);
            }
            else
            {
                int x=use_machine({c[0],v[s],c[1],v[s+1]});
                if(bit(x,0))b.pb(v[s+1]);
                else c.pb(v[s+1]);
                if(bit(x,1))b.pb(v[s]);
                else c.pb(v[s]);
            }
            s+=2;
        }
    }
    s4=0;
    while(s<v.size())
    {
        if(b.size()>=c.size())
        {
            vector<int> hihi;
            dem=0;
            s8=0;
            for(int i=0; i<b.size(); i++)
            {
                hihi.pb(b[i]);
                hihi.pb(v[s]);
                dem++;
                s++;
                if(s==v.size())break;
            }
            s7=use_machine(hihi);
            s4=s4+dem-(s7+1)/2;
            if(s7%2==0)b.pb(v[s-1]),s4--;
            else c.pb(v[s-1]);
        }
        else
        {
            vector<int> hihi;
            dem=0;
            for(int i=0; i<c.size(); i++)
            {
                hihi.pb(c[i]);
                hihi.pb(v[s]);
                s++;
                dem++;
                if(s==v.size())break;
            }
            s7=use_machine(hihi);
            if(s7%2==0)c.pb(v[s-1]);
            else b.pb(v[s-1]),s4--;
            s4=s4+(s7+1)/2;
        }
    }
    return s4+b.size();
}
void phongbeo()
{
    cin>>n;
    for(int i=0;i<n;i++)
        cin>>a[i];
    /*
    for(int i=0; i<n; i++)
        a[i]=rand(0,1);
    a[0]=1;*/
    for(int i=0; i<n; i++)
        s2+=(1-a[i]);
    s3=count_mushrooms(n);
    cout<<s3<<" "<<s2<<" "<<dem2,down
}

Compilation message (stderr)

mushrooms.cpp:27:17: warning: overflow in conversion from 'double' to 'int' changes value from '1.0e+16' to '2147483647' [-Woverflow]
   27 | const int inf = 1e16;
      |                 ^~~~

• Subtask 1: 92.623 / 100