Submission #708056

#	Time	Username	Problem	Language	Result	Execution time	Memory
708056		firewater	Coins (IOI17_coins)	C++14	100 / 100	9 ms	1552 KiB

coins

#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
#define ll long long
#include "coins.h"
using namespace std;

std::vector<int> coin_flips(std::vector<int> b, int c) {
    std::vector<int> flips(1);
    int now=0;
    for(int i=0;i<64;++i)
    	now^=i*b[i];
    flips[0]=now^c;
    return flips;
}

int find_coin(std::vector<int> b) {
    int now=0;
    for(int i=0;i<64;++i)
    	now^=i*b[i];
    return now;
}

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