Submission #829680

#	Time	Username	Problem	Language	Result	Execution time	Memory
829680		birthdaycake	Data Transfer (IOI19_transfer)	C++17	0 / 100	6 ms	4480 KiB

transfer

#include<bits/stdc++.h>
#include "transfer.h"
using namespace std; 



vector<int> get_attachment(vector<int> source) {
    vector<int>d;
    int x1 = 0, x2 = 0;
    for(int i = 0; i < source.size(); i++){
        x1 ^= source[i];
        if(source[i] == 1) x2 ^= i;
        d.push_back(source[i]);
    }
    //cout << x2 << endl;
    d.push_back(x1);
    for(int i = 0; i < 8; i++){
        if(x2 & (1 << i)) d.push_back(1);
        else d.push_back(0);
    }
    return d;
}

vector<int> retrieve(vector<int> data) {
    int x1 = 0, x2 = 0;
    if(data.size() == 72){
        for(int i = 0; i < 63; i++){
            x1 ^= data[i];
            if(data[i] == 1) x2 ^= i;
        }
        vector<int>ans;
        if(x1 == data[63]){
            for(int i = 0; i < 63; i++){
                ans.push_back(data[i]);
            }
            return ans;
        }else{
            int num = 0;
            for(int i = 64; i < 72; i++){
                if(data[i] == 1){
                    num += (1 << (i - 64));
                }
            }
            if(num == x2){
                for(int i = 0; i < 63; i++) ans.push_back(data[i]);
                return ans;
            }else{
                data[x2 ^ num] = !data[x2 ^ num];
                for(int i = 0; i < 63; i++) ans.push_back(data[i]);
                return ans;
            }
        }
    }else{
        for(int i = 0; i < 255; i++){
            x1 ^= data[i];
            if(data[i] == 1) x2 ^= i;
        }
        //cout << data.size() << ' ' << x1 << ' ' << x2 << ' ' << data[9] << endl;
        vector<int>ans;
        if(x1 == data[255]){
            for(int i = 0; i < 255; i++){
                ans.push_back(data[i]);
            }
            return ans;
        }else{
            int num = 0;
            for(int i = 256; i < 264; i++){
                //cout << data[i] << ' ';
                if(data[i] == 1){
                    num += (1 << (i - 256));
                }
            }
            //cout << endl;
            //cout << num << endl;
            if(num == x2){
                for(int i = 0; i < 255; i++) ans.push_back(data[i]);
                return ans;
            }else{
                data[x2 ^ num] = !data[x2 ^ num];
                for(int i = 0; i < 255; i++) ans.push_back(data[i]);
                return ans;
            }
        }
    }
}

Compilation message (stderr)

transfer.cpp: In function 'std::vector<int> get_attachment(std::vector<int>)':
transfer.cpp:10:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |     for(int i = 0; i < source.size(); i++){
      |                    ~~^~~~~~~~~~~~~~~

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