Submission #780828

#	Time	Username	Problem	Language	Result	Execution time	Memory
780828		teamariaa	Counting Mushrooms (IOI20_mushrooms)	C++17	0 / 100	2 ms	304 KiB

mushrooms

#include <bits/stdc++.h>
#include "mushrooms.h"

using namespace std;

#define pb push_back

int count_mushrooms(int n)
{
    vector <int> m, aPos, bPos;
    int ans, cnt, flag = 0;
    int capat = min(200, n);
    aPos.pb(0);
//    cout << capat << "\n";
    for(int i = 1; i < capat; i ++)
    {
//        cout << "a\n";
        m = {0, i};
        ans = use_machine(m);
        if(ans)
            bPos.pb(i);
        else
            aPos.pb(i);
    }

//    cout << "fsfsd " << bPos.size() << "\n";
    if(n < 200)
        return aPos.size();

    int len;

    if(aPos.size() > bPos.size())
    {
        m.resize(2 * aPos.size());
        for(int i = 0; i < aPos.size(); i ++)
            m[2 * i] = aPos[i];
        len = aPos.size();
    }
    else
    {
        m.resize(2 * bPos.size());
        flag = 1;
        for(int i = 0; i < bPos.size(); i ++)
            m[2 * i] = bPos[i];
        len = bPos.size();
    }

    cnt += aPos.size();

    int i = 200;
    while(i < n)
    {
        int k = 0;
        while(i < n  &&  k < len)
        {
            m[2 * k + 1] = i;
            i ++;
            k ++;
        }
        if(i == n  &&  k < len)
            m.resize(2 * k);

        ans = use_machine(m);
        if(flag)
        {
            cnt += (ans + 1) / 2;
        }
        else
        {
            int bNo = (ans + 1) / 2;
            cnt += len - bNo;
        }
    }
    return cnt;

//    for(int i = 0; i < (n - 200) / len; i ++)
//    {
//        for(int j = 200 + i * len; j < 200 + (i + 1) * len; j ++)
//        {
//            m[2 * j + 1] = j;
//        }
//
//        ans = use_machine(m);
//        if(flag)
//        {
//            cnt += (ans + 1) / 2;
//        }
//        else
//        {
//            int bNo = (ans + 1) / 2;
//            cnt += len - bNo;
//        }
//    }

}

Compilation message (stderr)

mushrooms.cpp: In function 'int count_mushrooms(int)':
mushrooms.cpp:35:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |         for(int i = 0; i < aPos.size(); i ++)
      |                        ~~^~~~~~~~~~~~~
mushrooms.cpp:43:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |         for(int i = 0; i < bPos.size(); i ++)
      |                        ~~^~~~~~~~~~~~~
mushrooms.cpp:48:9: warning: 'cnt' may be used uninitialized in this function [-Wmaybe-uninitialized]
   48 |     cnt += aPos.size();
      |     ~~~~^~~~~~~~~~~~~~

• Subtask 1: 0 / 100