Submission #1176729

#	Time	Username	Problem	Language	Result	Execution time	Memory
1176729		n3rm1n	Coins (IOI17_coins)	C++20	100 / 100	5 ms	584 KiB

coins

#include "coins.h"
using namespace std;
std::vector<int> coin_flips(std::vector<int> b, int c) {
    std::vector<int> flips(1);
    long long xr = 0;
    for (int i = 0; i < b.size(); ++ i)
    {
        xr = (xr ^ (i * b[i]));
    }
    xr ^= c;
    flips[0] = xr;
    return flips;
}

int find_coin(std::vector<int> b) {
   long long xr = 0;
   for (int i = 0; i < b.size(); ++ i)
   {
       xr = (xr ^ (i * b[i]));
   }
    return xr;
}

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