Submission #798502

#	Time	Username	Problem	Language	Result	Execution time	Memory
798502		hgmhc	Coins (IOI17_coins)	C++17	100 / 100	11 ms	1556 KiB

coins

#include "coins.h"
#include <bits/stdc++.h>
using namespace std; using ii = pair<int,int>; using ll = long long; using vi = vector<int>;
#define rep(i,a,b) for (auto i = (a); i <= (b); ++i)
#define per(i,a,b) for (auto i = (b); i >= (a); --i)
#define all(x) begin(x), end(x)
#define siz(x) int((x).size())
#define Mup(x,y) x = max(x,y)
#define mup(x,y) x = min(x,y)
#define fi first
#define se second
#define dbg(...) fprintf(stderr,__VA_ARGS__)

vi coin_flips(vi b, int c) {
    int sum=0;
    rep(i,0,63) sum ^= b[i]*i;
    rep(i,0,63) if ((sum^i) == c) return {i};
    assert(0);
}

int find_coin(vi b) {
    int sum=0;
    rep(i,0,63) sum ^= b[i]*i;
    return sum;
}

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