Submission #1165521

#	Time	Username	Problem	Language	Result	Execution time	Memory
1165521		gustavo_d	Coins (IOI17_coins)	C++20	100 / 100	5 ms	588 KiB

coins

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

vector<int> coin_flips(vector<int> b, int c) {
    int totXor = 0;
    for (int p=0; p<(int)b.size(); p++)
        totXor ^= p * b[p];
    // cout << c << ' ' << totXor << endl;
    vector<int> flips(1, c ^ totXor);
    return flips;
}

int find_coin(vector<int> b) {
    int ans = 0;
    for (int p=0; p<(int)b.size(); p++)
        ans ^= p * b[p];
    // cout << ans << endl;
    return ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 10 / 10
• Subtask 4: 15 / 15
• Subtask 5: 50 / 50