Submission #467170

#	Time	Username	Problem	Language	Result	Execution time	Memory
467170		Urvuk3	Data Transfer (IOI19_transfer)	C++17	0 / 100	12 ms	5300 KiB

transfer

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

using namespace std;

#define ll long long
#define fi first
#define se second
#define pll pair<ll,ll>
#define pii pair<int,int>
#define mid (l+r)/2
#define sz(a) int((a).size())
#define all(a) a.begin(),a.end()
#define mod 1000000007LL
#define pb push_back
#define endl "\n"
#define PRINT(x) cerr<<#x<<'-'<<x<<endl<<flush;
#define getunique(v) {sort(all(v)); v.erase(unique(all(v)), v.end());}
#define pb push_back
#define pf push_front
#define ppf pop_front
#define ppb pop_back

vector<int> to_bin(ll n,ll k){
    vector<int> ret;
    while(n!=0){
        ret.pb(n%2);
        n/=2;
    }
    for(int i=sz(ret);i<k;i++){
        ret.pb(0);
    }
    return ret;
}

ll to_int(vector<int> bin){
    ll ret=0;
    for(int i=0;i<sz(bin);i++){
        ret+=bin[i]*(1<<i);
    }
}

vector<int> get_attachment(vector<int> source){
    ll n=sz(source);
    ll k=(n==63 ? 6 : 8);
    ll x=0;
    ll odd=0;
    vector<int> append;
    for(int i=0;i<n;i++){
        if(source[i]){
            x^=i;
        }
    }
    append=to_bin(x,k);
    for(int i=0;i<k;i++){
        if(append[i]){
            odd^=1;
        }
    }
    append.pb(odd);
    source.insert(source.end(),all(append));
    return source;
}

vector<int> retrieve(vector<int> data){
    ll n=(sz(data)==70 ? 63 : 255);
    ll k=(n==63 ? 6 : 8);
    ll x=0;
    ll pravix=0;
    ll odd=data.back();
    vector<int> bitsn(data.begin(),data.begin()+n),bitsk(data.begin()+n,data.end()-1);
    pravix=to_int(bitsk);
    for(int i=0;i<n;i++){
        if(bitsn[i]){
            x^=i;
        }
    }
    if(x==pravix){
        return bitsn;
    }
    else{
        if((count(all(bitsk),1)&1)==odd){
            int idx=pravix^x;
            bitsn[idx]=1;
        }
        else{
            return bitsn;
        }
    }
}

Compilation message (stderr)

transfer.cpp: In function 'long long int to_int(std::vector<int>)':
transfer.cpp:41:1: warning: no return statement in function returning non-void [-Wreturn-type]
   41 | }
      | ^
transfer.cpp: In function 'std::vector<int> retrieve(std::vector<int>)':
transfer.cpp:67:8: warning: unused variable 'k' [-Wunused-variable]
   67 |     ll k=(n==63 ? 6 : 8);
      |        ^
transfer.cpp:71:85: warning: control reaches end of non-void function [-Wreturn-type]
   71 |     vector<int> bitsn(data.begin(),data.begin()+n),bitsk(data.begin()+n,data.end()-1);
      |                                                                                     ^

• Subtask 1: 0 / 60
• Subtask 2: 0 / 40