Submission #603963

#	Time	Username	Problem	Language	Result	Execution time	Memory
603963		neki	Unscrambling a Messy Bug (IOI16_messy)	C++14	100 / 100	5 ms	468 KiB

messy

#include <bits/stdc++.h>
#include "messy.h"
#define vc vector

using namespace std;

/*string permute(string s, vc<int> p){
    cout << s << endl;
    assert(s.size()==p.size());
    
    string ret(s.size(), '.');
    for(int i=0;i<s.size();++i) ret[i]=s[p[i]];
    return ret;
}
int cw=0, cr=0;
set<string> notr;
bool check_element(string s){
    ++cr;
    cout << s << endl;
    return notr.count(s)>0;
}
vc<int> p;
void add_element(string s){
    ++cw;
    cout << s << endl;
    notr.insert(permute(s, p));
}

void compile_set(){cout << '\n';}*/

/////////

void badd(int l, int r, int n){
    if(l+1==r) return;
    
    int mid=(l+r)/2;
    
    string s(n, '1');
    for(int i=l; i<r;++i) s[i]='0';
    for(int i=l; i<mid;++i){
        string t=s;
        t[i]='1';
        add_element(t);
    }
    
    badd(l, mid, n);
    badd(mid, r, n);
}

void bquery(int l, int r, int n, vc<int>& ans){
    if(l+1==r) return;
    
    int mid=(l+r)/2;
    
    string s(n, '1');
    for(int i=l; i<r;++i) s[ans[i]]='0';
    
    set<int> ls, rs;
    for(int i=l; i<r;++i){
        string t=s;
        t[ans[i]]='1';
        if(check_element(t)) ls.insert(ans[i]);
        else  rs.insert(ans[i]);
    }
    vc<int> lv(ls.begin(), ls.end()), rv(rs.begin(), rs.end());
    assert(lv.size()==(mid-l) and rv.size()==(r-mid));
    for(int i=l;i<mid;++i) ans[i]=lv[i-l];
    for(int i=mid;i<r;++i) ans[i]=rv[i-mid];
    
    bquery(l, mid, n, ans);
    bquery(mid, r, n, ans);
}

vc<int> inv(vc<int> ans){
    vc<int> ret(ans.size());
    for(int i=0;i<ans.size();++i) ret[ans[i]]=i;
    return ret;
}

vc<int> restore_permutation(int n, int w, int r){
    badd(0, n, n);
    compile_set();
    
    vc<int> ans(n); for(int i=0;i<n;++i) ans[i]=i;
    bquery(0, n, n, ans);
    return inv(ans);
}



/*int main(){
    int n=4;
    p={2, 1, 3, 0};
    
    vc<int> ans= restore_permutation(n, 0, 0);
    for(int i=0;i<n;++i) cout << ans[i]<<" ";cout << '\n';
    cout << cw << " "<< cr << endl;
}*/

Compilation message (stderr)

In file included from /usr/include/c++/10/cassert:44,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:33,
                 from messy.cpp:1:
messy.cpp: In function 'void bquery(int, int, int, std::vector<int>&)':
messy.cpp:66:21: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   66 |     assert(lv.size()==(mid-l) and rv.size()==(r-mid));
      |            ~~~~~~~~~^~~~~~~~~
messy.cpp:66:44: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   66 |     assert(lv.size()==(mid-l) and rv.size()==(r-mid));
      |                                   ~~~~~~~~~^~~~~~~~~
messy.cpp: In function 'std::vector<int> inv(std::vector<int>)':
messy.cpp:76:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   76 |     for(int i=0;i<ans.size();++i) ret[ans[i]]=i;
      |                 ~^~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 18 / 18
• Subtask 3: 11 / 11
• Subtask 4: 21 / 21
• Subtask 5: 30 / 30