Submission #713079

#	Time	Username	Problem	Language	Result	Execution time	Memory
713079		lam	Unscrambling a Messy Bug (IOI16_messy)	C++17	Compilation error	0 ms	0 KiB

messy

#include <vector>
#define ll long long
#include "messy.h"
using namespace std;
inline bool checkbit(ll i, int j)
{
    return i>>j&1;
}
inline string tostring(ll x, int n)
{
    string s="";
    for (int i=0; i<n; i++)
    {
        if (x%2LL==0) s+='0';
        else s+='1';
        x/=2LL;
    }
    return s;
}
vector<int32_t> restore_permutation(int32_t n, int32_t w, int32_t r) {
    string s="";
    for (int i=0; i<n; i++) s+='0';
    for (int i=n-1; i>=1; i--)
    {
        s[i] = '1';
        add_element(s);
    }
    compile_set();
    vector <int32_t> res(n);
    ll mask = 0LL;
    for (int it=0; it<n-1; it++)
    {
        vector <int> tmp; for (int j=0; j<n; j++) if (!checkbit(mask,j)) tmp.push_back(j);
        random_shuffle(tmp.begin(),tmp.end());
        for (int j:tmp)
        {
            mask^=(1LL<<j);
            bool check = check_element(tostring(mask,n));
            if (!check)
            {
                mask^=(1LL<<j);
                continue;
            }
            for (int j=0; j<n; j++)
                if (checkbit(mask,j)) res[j]++;
            break;
        }
    }
    return res;
}

Compilation message (stderr)

messy.cpp: In function 'std::vector<int> restore_permutation(int32_t, int32_t, int32_t)':
messy.cpp:34:9: error: 'random_shuffle' was not declared in this scope
   34 |         random_shuffle(tmp.begin(),tmp.end());
      |         ^~~~~~~~~~~~~~