Submission #798501

#	Time	Username	Problem	Language	Result	Execution time	Memory
798501		hgmhc	Coins (IOI17_coins)	C++17	0 / 100	6 ms	1516 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;
}

Compilation message (stderr)

coins.cpp: In function 'vi coin_flips(vi, int)':
coins.cpp:17:27: warning: suggest parentheses around comparison in operand of '^' [-Wparentheses]
   17 |     rep(i,0,63) if (sum^i == c) return {i};
      |                         ~~^~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 15
• Subtask 3: 0 / 10
• Subtask 4: 0 / 15
• Subtask 5: 0 / 50