Submission #354245

#	Time	Username	Problem	Language	Result	Execution time	Memory
354245		juggernaut	Counting Mushrooms (IOI20_mushrooms)	C++14	100 / 100	12 ms	500 KiB

mushrooms

#include"mushrooms.h"
#ifndef EVAL
#include"stub.cpp"
#endif
#include<bits/stdc++.h>
using namespace std;
int count_mushrooms(int n){
	vector<int>a,b;
	a.push_back(0);
	int id=1;
	while(max(a.size(),b.size())<100&&id<n){
        if(a.size()>=3&&b.size()>=2&&id+4<n){
            int ans1=use_machine({a[0],id,a[1],id+1,a[2],id+2});
            if(ans1&1)b.push_back(id+2);
            else a.push_back(id+2);
            ans1>>=1;
            if(ans1==0){
                a.push_back(id);
                a.push_back(id+1);
                id+=3;
            }else if(ans1==2){
                b.push_back(id);
                b.push_back(id+1);
                id+=3;
            }else{
                int ans2=use_machine({b[0],id,b[1],a[0],id+1,a[1],id+3,a[2],id+4})-1;
                if(ans2&1)b.push_back(id+4);
                else a.push_back(id+4);
                ans2>>=1;
                if(ans2&1)b.push_back(id+3);
                else a.push_back(id+3);
                ans2>>=1;
                if(ans2&1){
                    a.push_back(id);
                    b.push_back(id+1);
                }else{
                    b.push_back(id);
                    a.push_back(id+1);
                }
                id+=5;
            }
        }else if(b.size()>=3&&a.size()>=2&&id+4<n){
            int ans1=use_machine({b[0],id,b[1],id+1,b[2],id+2});
            if(ans1&1)a.push_back(id+2);
            else b.push_back(id+2);
            ans1>>=1;
            if(ans1==0){
                b.push_back(id);
                b.push_back(id+1);
                id+=3;
            }else if(ans1==2){
                a.push_back(id);
                a.push_back(id+1);
                id+=3;
            }else{
                int ans2=use_machine({a[0],id,a[1],b[0],id+1,b[1],id+3,b[2],id+4})-1;
                if(ans2&1)a.push_back(id+4);
                else b.push_back(id+4);
                ans2>>=1;
                if(ans2&1)a.push_back(id+3);
                else b.push_back(id+3);
                ans2>>=1;
                if(ans2&1){
                    b.push_back(id);
                    a.push_back(id+1);
                }else{
                    a.push_back(id);
                    b.push_back(id+1);
                }
                id+=5;
            }
        }else if(a.size()>=2&&id+1<n){
            int ans=use_machine({a[0],id,a[1],id+1});
            if(ans&1)b.push_back(id+1);
            else a.push_back(id+1);
            ans>>=1;
            if(ans&1)b.push_back(id);
            else a.push_back(id);
            id+=2;
        }else if(b.size()>=2&&id+1<n){
            int ans=use_machine({b[0],id,b[1],id+1});
            if(ans&1)a.push_back(id+1);
            else b.push_back(id+1);
            ans>>=1;
            if(ans&1)a.push_back(id);
            else b.push_back(id);
            id+=2;
        }else{
            if(use_machine({0,id}))b.push_back(id);
            else a.push_back(id);
            id++;
        }
	}
	int res=(int)a.size();
	while(id<n){
        if(a.size()>b.size()){
            vector<int>v;
            for(int i=0;i<a.size()&&id<n;i++){
                v.push_back(a[i]);
                v.push_back(id++);
            }
            int ans=use_machine(v);
            if(ans&1)b.push_back(v.back());
            else a.push_back(v.back());
            ans++;
            ans>>=1;
            res+=(int(v.size())>>1)-ans;
        }else{
            vector<int>v;
            for(int i=0;i<b.size()&&id<n;i++){
                v.push_back(b[i]);
                v.push_back(id++);
            }
            int ans=use_machine(v);
            if(ans&1)a.push_back(v.back());
            else b.push_back(v.back());
            ans++;
            ans>>=1;
            res+=ans;
        }
    }
    return res;
}

Compilation message (stderr)

mushrooms.cpp: In function 'int count_mushrooms(int)':
mushrooms.cpp:98:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   98 |             for(int i=0;i<a.size()&&id<n;i++){
      |                         ~^~~~~~~~~
mushrooms.cpp:110:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  110 |             for(int i=0;i<b.size()&&id<n;i++){
      |                         ~^~~~~~~~~

• Subtask 1: 100 / 100