Submission #144714

#	Time	Username	Problem	Language	Result	Execution time	Memory
144714		socho	Data Transfer (IOI19_transfer)	C++14	0 / 100	13 ms	2480 KiB

transfer

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

vector<int> get_attachment(vector<int> source) {
    int BLE;
    int n = source.size();
    
    if (n == 63) BLE = 6;
    else BLE = 8;
    
    int att[BLE];
    memset(att, 0, sizeof att);
    
    for (int i=0; i<BLE; i++) {
        for (int j=0; j<n; j++) {
            if (source[j] == 1) {
                if ((1 << i) & j) {
                    att[i]++;
                }
            }
        }
        att[i] = att[i] % 2;
    }
    
    vector<int> fn;
    int sm = 0;
    for (int i=0; i<BLE; i++) {
        fn.push_back(att[i]);
        sm += att[i];
    }
    sm = sm % 2;
    fn.push_back(sm);
    
    return fn;
    
}

vector<int> retrieve(vector<int> data) {
    int n;
    int BLE;
    if (data.size() == 70) {
        n = 63;
        BLE = 6;
    }
    else {
        n = 255;
        BLE = 8;
    }
    vector<int> rec;
    for (int i=n; i<data.size(); i++) {
        rec.push_back(data[i]);
    }
    int sm = 0;
    for (int i=0; i<BLE; i++) {
        sm += rec[i];
    }
    sm = sm % 2;
    if (sm != data[data.size()-1]) {
        vector<int> act;
        for (int i=0; i<n; i++) {
            act.push_back(data[i]);
        }
        return act;
    }
    
    int att[BLE];
    memset(att, 0, sizeof att);
    
    for (int i=0; i<BLE; i++) {
        for (int j=0; j<n; j++) {
            if (data[j] == 1) {
                if ((1 << i) & j) {
                    att[i]++;
                }
            }
        }
        att[i] = att[i] % 2;
    }
    
    vector<int> act;
    for (int i=0; i<n; i++) {
        act.push_back(data[i]);
    }
    
    bool flag = false;
    
    for (int i=0; i<BLE; i++) {
        if (rec[i] != att[i]) {
            flag = true;
        }
    }
    
    if (!flag) return act;
    
    int con = 0;
    for (int i=0; i<BLE; i++) {
        if (rec[i] != att[i]) {
            con += (1 << i);
        }
    }
    act[con] = 1 - act[con];
    return act;
    
}

Compilation message (stderr)

transfer.cpp: In function 'std::vector<int> retrieve(std::vector<int>)':
transfer.cpp:51:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i=n; i<data.size(); i++) {
                   ~^~~~~~~~~~~~

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